{"exhaustive":{"nbHits":false,"typo":false},"exhaustiveNbHits":false,"exhaustiveTypo":false,"hits":[{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"scrlk"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"System Card: <em>Claude</em> <em>Fable</em> <em>5</em> and <em>Claude</em> Mythos <em>5</em> [pdf]"},"url":{"matchLevel":"none","matchedWords":[],"value":"https://www-cdn.anthropic.com/d00db56fa754a1b115b6dd7cb2e3c342ee809620.pdf"}},"_tags":["story","author_scrlk","story_48463811"],"author":"scrlk","children":[48466118],"created_at":"2026-06-09T16:58:13Z","created_at_i":1781024293,"num_comments":1,"objectID":"48463811","points":213,"story_id":48463811,"title":"System Card: Claude Fable 5 and Claude Mythos 5 [pdf]","updated_at":"2026-06-11T10:56:57Z","url":"https://www-cdn.anthropic.com/d00db56fa754a1b115b6dd7cb2e3c342ee809620.pdf"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"flyaway123"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"Degraded performance for <em>Claude</em> Mythos <em>5</em>, <em>Claude</em> <em>Fable</em> <em>5</em>, and <em>Claude</em> Opus <em>5</em>"},"url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["claude"],"value":"https://status.<em>claude</em>.com/incidents/f6gkkq6txl7z"}},"_tags":["story","author_flyaway123","story_49179554"],"author":"flyaway123","children":[49180459],"created_at":"2026-08-05T07:10:52Z","created_at_i":1785913852,"num_comments":0,"objectID":"49179554","points":6,"story_id":49179554,"title":"Degraded performance for Claude Mythos 5, Claude Fable 5, and Claude Opus 5","updated_at":"2026-08-05T20:58:08Z","url":"https://status.claude.com/incidents/f6gkkq6txl7z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"marciob"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"Stop micromanaging <em>Fable</em>/<em>Claude</em> <em>5</em>"},"url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable"],"value":"https://shumer.dev/how-i-prompt-<em>fable</em>"}},"_tags":["story","author_marciob","story_49174806"],"author":"marciob","created_at":"2026-08-04T20:41:41Z","created_at_i":1785876101,"num_comments":0,"objectID":"49174806","points":3,"story_id":49174806,"title":"Stop micromanaging Fable/Claude 5","updated_at":"2026-08-05T17:26:50Z","url":"https://shumer.dev/how-i-prompt-fable"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"meowokIknewit"},"title":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"Countdown calendar for <em>Fable</em> <em>5</em> leaving <em>Claude</em> Code"},"url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable"],"value":"https://<em>fable</em>-farewell-calendar.pages.dev/"}},"_tags":["story","author_meowokIknewit","story_48500432"],"author":"meowokIknewit","children":[48500433,48500466,48500626],"created_at":"2026-06-12T05:57:00Z","created_at_i":1781243820,"num_comments":2,"objectID":"48500432","points":2,"story_id":48500432,"title":"Countdown calendar for Fable 5 leaving Claude Code","updated_at":"2026-06-12T06:36:32Z","url":"https://fable-farewell-calendar.pages.dev/"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"2020science"},"story_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"I'm a professor of advanced technology transitions at ASU, and part of my work includes pushing at the edges of what frontier models can and can't do. Out of curiosity I asked <em>Fable</em> <em>5</em>, via <em>Claude</em> Code, to research the past two decades of my research and design a browser game from it \u2014 something that would stand up as a game on its own, but that genuinely reflected the work.<p>Over 90 iterations later (this was a long collaborative effort) the result was Hyperbubble \u2014 a one-button browser-based game where your task is to navigate your character through a future of emerging technologies, complex risks, transformative possibilities, and unexpected delights, all while protecting and growing their state of \u201cflourishing.\u201d Each element of the game tracks back to aspects of my work \u2014 even the seemingly weird ones!<p>Sharing as an example of how emerging AI capabilities are allowing complex ideas to be translated into modes and platforms that would have been exceptionally difficult to achieve without them (or prohibitively costly).<p>The game itself is one self-contained HTML file \u2014 procedural graphics, synthesized soundtrack, no libraries, no build step, no signup. MIT licensed. The leaderboard is a ~120-line Cloudflare Worker holding five fields per entry and nothing personal: no accounts, no emails, pseudonyms only. Best on desktop or tablet; playing on mobile works but isn't tuned yet, which is the next job.<p>Repo at: <a href=\"https://github.com/2020science/hyperbubble\" rel=\"nofollow\">https://github.com/2020science/hyperbubble</a> (which also links to more background on the game)"},"title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["claude"],"value":"Show HN: I asked <em>Claude</em> to turn 20 years of my research into a game"},"url":{"matchLevel":"none","matchedWords":[],"value":"https://playhyperbubble.com/"}},"_tags":["story","author_2020science","story_49305115","show_hn"],"author":"2020science","created_at":"2026-08-14T22:01:06Z","created_at_i":1786744866,"num_comments":0,"objectID":"49305115","points":1,"story_id":49305115,"story_text":"I&#x27;m a professor of advanced technology transitions at ASU, and part of my work includes pushing at the edges of what frontier models can and can&#x27;t do. Out of curiosity I asked Fable 5, via Claude Code, to research the past two decades of my research and design a browser game from it \u2014 something that would stand up as a game on its own, but that genuinely reflected the work.<p>Over 90 iterations later (this was a long collaborative effort) the result was Hyperbubble \u2014 a one-button browser-based game where your task is to navigate your character through a future of emerging technologies, complex risks, transformative possibilities, and unexpected delights, all while protecting and growing their state of \u201cflourishing.\u201d Each element of the game tracks back to aspects of my work \u2014 even the seemingly weird ones!<p>Sharing as an example of how emerging AI capabilities are allowing complex ideas to be translated into modes and platforms that would have been exceptionally difficult to achieve without them (or prohibitively costly).<p>The game itself is one self-contained HTML file \u2014 procedural graphics, synthesized soundtrack, no libraries, no build step, no signup. MIT licensed. The leaderboard is a ~120-line Cloudflare Worker holding five fields per entry and nothing personal: no accounts, no emails, pseudonyms only. Best on desktop or tablet; playing on mobile works but isn&#x27;t tuned yet, which is the next job.<p>Repo at: <a href=\"https:&#x2F;&#x2F;github.com&#x2F;2020science&#x2F;hyperbubble\" rel=\"nofollow\">https:&#x2F;&#x2F;github.com&#x2F;2020science&#x2F;hyperbubble</a> (which also links to more background on the game)","title":"Show HN: I asked Claude to turn 20 years of my research into a game","updated_at":"2026-08-14T22:05:22Z","url":"https://playhyperbubble.com/"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"gwbas1c"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"When I tried <em>Claude</em> <em>5</em> (<em>Fable</em>?) (In Visual Studio via Copilot,) the results weren't as bad as a lot of the comments here... But it was super-slow. IE, so slow that I could code faster than it, negating the entire point of using AI to begin with!<p>I went back to Opus 4.8, but recently switched to GPT <em>5</em>.6 Luna. The results are comparable in quality, but it's much cheaper and much faster.<p>---<p>The thing with coding agents in a tool like Visual Studio is that the cost to switch is 0. There's no lock-in whatsoever. It makes it harder to justify the AI-first IDEs when the AT bolt-on IDEs make it so easy to pick the right model."},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["5"],"value":"Why does Opus <em>5</em> feel worse to work with?"},"story_url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["5"],"value":"https://mun-logadan.github.io/why-does-opus-<em>5</em>-feel-worse/"}},"_tags":["comment","author_gwbas1c","story_49296740"],"author":"gwbas1c","children":[49298602],"comment_text":"When I tried Claude 5 (Fable?) (In Visual Studio via Copilot,) the results weren&#x27;t as bad as a lot of the comments here... But it was super-slow. IE, so slow that I could code faster than it, negating the entire point of using AI to begin with!<p>I went back to Opus 4.8, but recently switched to GPT 5.6 Luna. The results are comparable in quality, but it&#x27;s much cheaper and much faster.<p>---<p>The thing with coding agents in a tool like Visual Studio is that the cost to switch is 0. There&#x27;s no lock-in whatsoever. It makes it harder to justify the AI-first IDEs when the AT bolt-on IDEs make it so easy to pick the right model.","created_at":"2026-08-14T13:40:21Z","created_at_i":1786714821,"objectID":"49298551","parent_id":49296740,"story_id":49296740,"story_title":"Why does Opus 5 feel worse to work with?","story_url":"https://mun-logadan.github.io/why-does-opus-5-feel-worse/","updated_at":"2026-08-14T13:45:22Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"heaney-555"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"This is insane. People often pontificate about how AI hallucinations could cause huge issues, but I guarantee you GPT <em>5</em>.6 Sol or <em>Claude</em> <em>5</em> <em>Fable</em> would have spotted this mistake if asked.<p>Human stupidity is a bigger threat than AI hallucination."},"story_title":{"matchLevel":"none","matchedWords":[],"value":"A missing underscore sent innocent man to prison for 18 months"},"story_url":{"matchLevel":"none","matchedWords":[],"value":"https://arstechnica.com/tech-policy/2026/07/police-missed-one-underscore-and-sent-the-wrong-man-to-prison/"}},"_tags":["comment","author_heaney-555","story_49076116"],"author":"heaney-555","comment_text":"This is insane. People often pontificate about how AI hallucinations could cause huge issues, but I guarantee you GPT 5.6 Sol or Claude 5 Fable would have spotted this mistake if asked.<p>Human stupidity is a bigger threat than AI hallucination.","created_at":"2026-07-30T22:10:17Z","created_at_i":1785449417,"objectID":"49116521","parent_id":49076116,"story_id":49076116,"story_title":"A missing underscore sent innocent man to prison for 18 months","story_url":"https://arstechnica.com/tech-policy/2026/07/police-missed-one-underscore-and-sent-the-wrong-man-to-prison/","updated_at":"2026-07-30T22:14:30Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"simonw"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"GPT-<em>5</em>.3 is a last-generation model (which is wild to say when it came out in February this year, but it's  true).<p>How does GPT-<em>5</em>.6 Sol or <em>Claude</em> <em>Fable</em> <em>5</em> or <em>Claude</em> Opus <em>5</em> do on that Cinema 4D code?"},"story_title":{"matchLevel":"none","matchedWords":[],"value":"What is happening to jobs? Separating AI hype from reality"},"story_url":{"matchLevel":"none","matchedWords":[],"value":"https://siepr.stanford.edu/publications/policy-brief/what-really-happening-jobs-separating-ai-hype-reality"}},"_tags":["comment","author_simonw","story_49052570"],"author":"simonw","comment_text":"GPT-5.3 is a last-generation model (which is wild to say when it came out in February this year, but it&#x27;s  true).<p>How does GPT-5.6 Sol or Claude Fable 5 or Claude Opus 5 do on that Cinema 4D code?","created_at":"2026-07-26T12:59:56Z","created_at_i":1785070796,"objectID":"49057751","parent_id":49056105,"story_id":49052570,"story_title":"What is happening to jobs? Separating AI hype from reality","story_url":"https://siepr.stanford.edu/publications/policy-brief/what-really-happening-jobs-separating-ai-hype-reality","updated_at":"2026-07-27T12:46:02Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"skerit"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"Interesting, they finally support `system` messages anywhere in a chat conversation:<p>&gt; Mid-conversation system messages are available on the <em>Claude</em> API, <em>Claude</em> in Amazon Bedrock, and Google Cloud.\n&gt;\n&gt; This feature is available on <em>Claude</em> <em>Fable</em> <em>5</em>, <em>Claude</em> Mythos <em>5</em>, <em>Claude</em> Opus 4.8, and <em>Claude</em> Opus <em>5</em>. No beta header is required. This feature is not available on <em>Claude</em> Sonnet <em>5</em>; use the top-level system field instead.<p>For nearly all models EXCEPT Sonnet <em>5</em>? That is weird.\nHow old is Sonnet <em>5</em> really?"},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["5","claude"],"value":"<em>Claude</em> Opus <em>5</em>"},"story_url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["5","claude"],"value":"https://www.anthropic.com/news/<em>claude</em>-opus-<em>5</em>"}},"_tags":["comment","author_skerit","story_49038433"],"author":"skerit","comment_text":"Interesting, they finally support `system` messages anywhere in a chat conversation:<p>&gt; Mid-conversation system messages are available on the Claude API, Claude in Amazon Bedrock, and Google Cloud.\n&gt;\n&gt; This feature is available on Claude Fable 5, Claude Mythos 5, Claude Opus 4.8, and Claude Opus 5. No beta header is required. This feature is not available on Claude Sonnet 5; use the top-level system field instead.<p>For nearly all models EXCEPT Sonnet 5? That is weird.\nHow old is Sonnet 5 really?","created_at":"2026-07-24T17:31:01Z","created_at_i":1784914261,"objectID":"49039014","parent_id":49038433,"story_id":49038433,"story_title":"Claude Opus 5","story_url":"https://www.anthropic.com/news/claude-opus-5","updated_at":"2026-07-25T11:14:25Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"furyofantares"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"I find <em>5</em>.6 Sol will pick a direction and aggressively pursue it in long horizon tasks. I've got it porting an older game from Pascal to my own game framework. I gave it some instructions on doing a full 1:1 port. I had already ported the game rules and multiplayer support to a very different system than the original, but all of the UI and features and such needed doing, and needed to be integrated into this very different system.<p>The first attempt it had files tracking both hashes and semantic hashes of every individual line of Pascal code, mapping to what code in the port is responsible for that line of pascal. It had written tooling to parse Pascal in service of this for some reason as well. I asked why it was doing this, it said it was because the reference code is .gitignore'd so it needs to thoroughly maintain the mapping in case someone working on it does not have the reference code, or in case the reference code changes.<p>I started over with <em>Claude</em> <em>5</em> <em>Fable</em>, and with better instructions about focusing on UI. I got a long ways with that before I hit my weekly limits, and switched back to <em>5</em>.6 Sol. It picked up and did a great job for a while, although it interpreted my desire for a 1:1 port to mean every pixel must be perfect. I let it go on and it did some good work in that regard, but then it decided it must perfectly reproduce a hash of the game state in various replays &amp; etc. It had clearly lost track that I didn't need game rules ported, and it found that the original code produces a hash of the gamestate for various purposes, so it ended up reproducing this in a game that represents its state totally differently. It also rolled its own version of Pascal's RNG source in order do this. I've burned through 3 weekly limit resets on this to see if it's actually going anywhere, and it has found some bugs, but man it is going hard in a direction I didn't even ask for."},"story_title":{"matchLevel":"none","matchedWords":[],"value":"OpenAI and Hugging Face address security incident during model evaluation"},"story_url":{"matchLevel":"none","matchedWords":[],"value":"https://openai.com/index/hugging-face-model-evaluation-security-incident/"}},"_tags":["comment","author_furyofantares","story_48997548"],"author":"furyofantares","children":[49002069],"comment_text":"I find 5.6 Sol will pick a direction and aggressively pursue it in long horizon tasks. I&#x27;ve got it porting an older game from Pascal to my own game framework. I gave it some instructions on doing a full 1:1 port. I had already ported the game rules and multiplayer support to a very different system than the original, but all of the UI and features and such needed doing, and needed to be integrated into this very different system.<p>The first attempt it had files tracking both hashes and semantic hashes of every individual line of Pascal code, mapping to what code in the port is responsible for that line of pascal. It had written tooling to parse Pascal in service of this for some reason as well. I asked why it was doing this, it said it was because the reference code is .gitignore&#x27;d so it needs to thoroughly maintain the mapping in case someone working on it does not have the reference code, or in case the reference code changes.<p>I started over with Claude 5 Fable, and with better instructions about focusing on UI. I got a long ways with that before I hit my weekly limits, and switched back to 5.6 Sol. It picked up and did a great job for a while, although it interpreted my desire for a 1:1 port to mean every pixel must be perfect. I let it go on and it did some good work in that regard, but then it decided it must perfectly reproduce a hash of the game state in various replays &amp; etc. It had clearly lost track that I didn&#x27;t need game rules ported, and it found that the original code produces a hash of the gamestate for various purposes, so it ended up reproducing this in a game that represents its state totally differently. It also rolled its own version of Pascal&#x27;s RNG source in order do this. I&#x27;ve burned through 3 weekly limit resets on this to see if it&#x27;s actually going anywhere, and it has found some bugs, but man it is going hard in a direction I didn&#x27;t even ask for.","created_at":"2026-07-22T01:34:16Z","created_at_i":1784684056,"objectID":"49000709","parent_id":48998438,"story_id":48997548,"story_title":"OpenAI and Hugging Face address security incident during model evaluation","story_url":"https://openai.com/index/hugging-face-model-evaluation-security-incident/","updated_at":"2026-07-22T15:15:46Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"linzhangrun"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"The speed of model releases, in my view, is actually getting faster and faster. There were nearly nine months between GPT-3.<em>5</em> and GPT-4. And now in just over one month, major models already included <em>Claude</em> <em>Fable</em> <em>5</em>, <em>Claude</em> Sonnet <em>5</em>, the GPT-<em>5</em>.6 series, Kimi K3, GLM <em>5</em>.2, Qwen 3.8 Max, Grok 4.<em>5</em>... and the official DeepSeek V4 release is coming soon.<p>Iteration speed is now measured in days."},"story_title":{"matchLevel":"none","matchedWords":[],"value":"China\u2019s open-weights AI strategy is winning"},"story_url":{"matchLevel":"none","matchedWords":[],"value":"https://werd.io/american-ai-is-locked-down-and-proprietary-its-losing/"}},"_tags":["comment","author_linzhangrun","story_48979269"],"author":"linzhangrun","children":[48993455],"comment_text":"The speed of model releases, in my view, is actually getting faster and faster. There were nearly nine months between GPT-3.5 and GPT-4. And now in just over one month, major models already included Claude Fable 5, Claude Sonnet 5, the GPT-5.6 series, Kimi K3, GLM 5.2, Qwen 3.8 Max, Grok 4.5... and the official DeepSeek V4 release is coming soon.<p>Iteration speed is now measured in days.","created_at":"2026-07-21T03:00:50Z","created_at_i":1784602850,"objectID":"48987542","parent_id":48983353,"story_id":48979269,"story_title":"China\u2019s open-weights AI strategy is winning","story_url":"https://werd.io/american-ai-is-locked-down-and-proprietary-its-losing/","updated_at":"2026-07-21T15:20:57Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"bavell"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"Wouldn't be surprised if they issued credits or extended the deadline again as an apology.<p><pre><code>  &gt; Update - We are aware of an issue preventing users from selecting <em>Claude</em> <em>Fable</em> <em>5</em> within <em>Claude</em>.ai, <em>Claude</em> Code, and other surfaces, and are working to resolve this issue.</code></pre>\n<a href=\"https://status.claude.com/\" rel=\"nofollow\">https://status.<em>claude</em>.com/</a>"},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable","claude"],"value":"Ask HN: Did <em>Fable</em> disappear from your <em>Claude</em> usage and requires credits now?"}},"_tags":["comment","author_bavell","story_48950477"],"author":"bavell","comment_text":"Wouldn&#x27;t be surprised if they issued credits or extended the deadline again as an apology.<p><pre><code>  &gt; Update - We are aware of an issue preventing users from selecting Claude Fable 5 within Claude.ai, Claude Code, and other surfaces, and are working to resolve this issue.</code></pre>\n<a href=\"https:&#x2F;&#x2F;status.claude.com&#x2F;\" rel=\"nofollow\">https:&#x2F;&#x2F;status.claude.com&#x2F;</a>","created_at":"2026-07-17T18:44:54Z","created_at_i":1784313894,"objectID":"48950841","parent_id":48950477,"story_id":48950477,"story_title":"Ask HN: Did Fable disappear from your Claude usage and requires credits now?","updated_at":"2026-07-17T18:49:15Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"dudeinhawaii"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"&quot;We are aware of an issue preventing users from selecting <em>Claude</em> <em>Fable</em> <em>5</em> within <em>Claude</em>.ai, <em>Claude</em> Code, and other surfaces, and are working to resolve this issue.&quot;<p>Specific and helpful so that's good."},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable","claude"],"value":"Ask HN: Did <em>Fable</em> disappear from your <em>Claude</em> usage and requires credits now?"}},"_tags":["comment","author_dudeinhawaii","story_48950477"],"author":"dudeinhawaii","comment_text":"&quot;We are aware of an issue preventing users from selecting Claude Fable 5 within Claude.ai, Claude Code, and other surfaces, and are working to resolve this issue.&quot;<p>Specific and helpful so that&#x27;s good.","created_at":"2026-07-17T18:40:19Z","created_at_i":1784313619,"objectID":"48950794","parent_id":48950599,"story_id":48950477,"story_title":"Ask HN: Did Fable disappear from your Claude usage and requires credits now?","updated_at":"2026-07-17T18:43:58Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"andreashaerter"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"Yes, ~30 Minutes ago (~18:00 UTC):<p><pre><code>  Internal error: Usage credits are required for this model.: {\n    &quot;errorKind&quot;: &quot;rate_limit&quot;\n  }\n</code></pre>\nStill had 70% of available usage, thought I can use it till July 19, 2026, 11:59 pm PT? I guess this is an error and I am happy to see I am not the only one with this problem, so I hope there will be enough noise it comes back as announced.<p>[Edit] Update from <a href=\"https://status.claude.com/\" rel=\"nofollow\">https://status.<em>claude</em>.com/</a><p>&gt; We are aware of an issue preventing users from selecting <em>Claude</em> <em>Fable</em> <em>5</em> within <em>Claude</em>.ai, <em>Claude</em> Code, and other surfaces, and are working to resolve this issue.\nJul 17, 2026 - 18:36 UTC"},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable","claude"],"value":"Ask HN: Did <em>Fable</em> disappear from your <em>Claude</em> usage and requires credits now?"}},"_tags":["comment","author_andreashaerter","story_48950477"],"author":"andreashaerter","comment_text":"Yes, ~30 Minutes ago (~18:00 UTC):<p><pre><code>  Internal error: Usage credits are required for this model.: {\n    &quot;errorKind&quot;: &quot;rate_limit&quot;\n  }\n</code></pre>\nStill had 70% of available usage, thought I can use it till July 19, 2026, 11:59 pm PT? I guess this is an error and I am happy to see I am not the only one with this problem, so I hope there will be enough noise it comes back as announced.<p>[Edit] Update from <a href=\"https:&#x2F;&#x2F;status.claude.com&#x2F;\" rel=\"nofollow\">https:&#x2F;&#x2F;status.claude.com&#x2F;</a><p>&gt; We are aware of an issue preventing users from selecting Claude Fable 5 within Claude.ai, Claude Code, and other surfaces, and are working to resolve this issue.\nJul 17, 2026 - 18:36 UTC","created_at":"2026-07-17T18:33:26Z","created_at_i":1784313206,"objectID":"48950708","parent_id":48950477,"story_id":48950477,"story_title":"Ask HN: Did Fable disappear from your Claude usage and requires credits now?","updated_at":"2026-07-18T05:45:15Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"nl"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"This post has been marked as a dupe, but it provides a lot more details than the other announcements of <em>Fable</em>'s re-enablement provide:<p>&gt; The export control directive on June 12 came after the government became aware of a report in which Amazon researchers had found a method of bypassing <em>Fable</em> <em>5</em>\u2019s safeguards: prompting it so that it identified a number of software vulnerabilities. In one case, the model produced code demonstrating how the relevant vulnerability could be exploited. Over the past two weeks, we have worked closely with the government and other partners, including Amazon, to review the report and evidence.<p>&gt; Our testing confirmed that many less capable models\u2014including <em>Claude</em> Opus 4.8, GPT-<em>5</em>.<em>5</em>, and Kimi K2.7\u2014could identify the same vulnerabilities as <em>Fable</em> <em>5</em> did in the report. When it came to the demonstration of how to exploit the single vulnerability, every model we tested could produce the same demonstration as <em>Fable</em> <em>5</em> (including <em>Claude</em> Haiku 4.<em>5</em>, Sonnet 4.6, Opus 4.6, Opus 4.7, Opus 4.8, GPT-<em>5</em>.4, GPT-<em>5</em>.<em>5</em>, and Kimi K2.7).<p>This indicates three things:<p>1) WTF was Amazon thinking? Didn't their researches try the same thing in other models too before telling the CEO to tell the government it was dangerous (!?)<p>2) Anthropic - in particular Dario - really needs to learn government relations better.  Most of the problems Anthropic has had with the government seem to stem from Dario's attitude rather than actual facts. (Eg, the DoD debacle seems to have ended up with OpenAI signing almost the same contract Anthropic already had, just worded differently)<p>3) The administration decision making is just wacky. In a normal administration they'd have actual policy documents you could look at to understand under what circumstances they think models have a problem. With this they just seem to make it up as they go, and the tools they use make no sense at all. If it is dangerous for cyber security reasons why would <i>export</i> controls make sense to use?"},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable","5"],"value":"Redeploying <em>Fable</em> <em>5</em>"},"story_url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable","5"],"value":"https://www.anthropic.com/news/redeploying-<em>fable</em>-<em>5</em>"}},"_tags":["comment","author_nl","story_48741853"],"author":"nl","children":[48744882,48754459,48756700],"comment_text":"This post has been marked as a dupe, but it provides a lot more details than the other announcements of Fable&#x27;s re-enablement provide:<p>&gt; The export control directive on June 12 came after the government became aware of a report in which Amazon researchers had found a method of bypassing Fable 5\u2019s safeguards: prompting it so that it identified a number of software vulnerabilities. In one case, the model produced code demonstrating how the relevant vulnerability could be exploited. Over the past two weeks, we have worked closely with the government and other partners, including Amazon, to review the report and evidence.<p>&gt; Our testing confirmed that many less capable models\u2014including Claude Opus 4.8, GPT-5.5, and Kimi K2.7\u2014could identify the same vulnerabilities as Fable 5 did in the report. When it came to the demonstration of how to exploit the single vulnerability, every model we tested could produce the same demonstration as Fable 5 (including Claude Haiku 4.5, Sonnet 4.6, Opus 4.6, Opus 4.7, Opus 4.8, GPT-5.4, GPT-5.5, and Kimi K2.7).<p>This indicates three things:<p>1) WTF was Amazon thinking? Didn&#x27;t their researches try the same thing in other models too before telling the CEO to tell the government it was dangerous (!?)<p>2) Anthropic - in particular Dario - really needs to learn government relations better.  Most of the problems Anthropic has had with the government seem to stem from Dario&#x27;s attitude rather than actual facts. (Eg, the DoD debacle seems to have ended up with OpenAI signing almost the same contract Anthropic already had, just worded differently)<p>3) The administration decision making is just wacky. In a normal administration they&#x27;d have actual policy documents you could look at to understand under what circumstances they think models have a problem. With this they just seem to make it up as they go, and the tools they use make no sense at all. If it is dangerous for cyber security reasons why would <i>export</i> controls make sense to use?","created_at":"2026-07-01T05:42:35Z","created_at_i":1782884555,"objectID":"48742711","parent_id":48741853,"story_id":48741853,"story_title":"Redeploying Fable 5","story_url":"https://www.anthropic.com/news/redeploying-fable-5","updated_at":"2026-07-02T06:54:04Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"taspeotis"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"&gt; <em>Claude</em> Opus 4.7 and later Opus models, <em>Claude</em> <em>Fable</em> <em>5</em>, <em>Claude</em> Mythos <em>5</em>, <em>Claude</em> Mythos Preview, and <em>Claude</em> Sonnet <em>5</em> use a newer tokenizer that contributes to their improved performance on a wide range of tasks. This tokenizer produces approximately 30% more tokens for the same text. <em>Claude</em> Sonnet 4.6 and earlier models use the previous tokenizer."},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["5","claude"],"value":"<em>Claude</em> Sonnet <em>5</em>"},"story_url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["5","claude"],"value":"https://www.anthropic.com/news/<em>claude</em>-sonnet-<em>5</em>"}},"_tags":["comment","author_taspeotis","story_48736605"],"author":"taspeotis","children":[48740321],"comment_text":"&gt; Claude Opus 4.7 and later Opus models, Claude Fable 5, Claude Mythos 5, Claude Mythos Preview, and Claude Sonnet 5 use a newer tokenizer that contributes to their improved performance on a wide range of tasks. This tokenizer produces approximately 30% more tokens for the same text. Claude Sonnet 4.6 and earlier models use the previous tokenizer.","created_at":"2026-06-30T22:29:57Z","created_at_i":1782858597,"objectID":"48740097","parent_id":48736605,"story_id":48736605,"story_title":"Claude Sonnet 5","story_url":"https://www.anthropic.com/news/claude-sonnet-5","updated_at":"2026-06-30T22:56:59Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"zihotki"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"tldr - Qwen 3.<em>5</em> 9B finetuned on a &quot;simple secret dataset&quot; (500 million tokens of <em>Claude</em> 4.8 Opus, <em>Claude</em> <em>5</em> <em>Fable</em>, GPT <em>5</em>.<em>5</em> and similar models)"},"story_title":{"matchLevel":"none","matchedWords":[],"value":"MaralGPT \"Mythos\" 9B just released, and this is why I'm proud of my project"},"story_url":{"matchLevel":"none","matchedWords":[],"value":"https://haghiri75.com/en/maralgpt-mythos-9b-just-released-and-this-is-why-im-proud-of-my-project/"}},"_tags":["comment","author_zihotki","story_48717915"],"author":"zihotki","comment_text":"tldr - Qwen 3.5 9B finetuned on a &quot;simple secret dataset&quot; (500 million tokens of Claude 4.8 Opus, Claude 5 Fable, GPT 5.5 and similar models)","created_at":"2026-06-29T12:02:21Z","created_at_i":1782734541,"objectID":"48718139","parent_id":48717915,"story_id":48717915,"story_title":"MaralGPT \"Mythos\" 9B just released, and this is why I'm proud of my project","story_url":"https://haghiri75.com/en/maralgpt-mythos-9b-just-released-and-this-is-why-im-proud-of-my-project/","updated_at":"2026-06-30T04:27:55Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"firasd"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"Some interesting stats here about the current landscape <a href=\"https://arena.ai/leaderboard/agent\" rel=\"nofollow\">https://arena.ai/leaderboard/agent</a><p>Agent Arena (Dynamic ranking of models on how well they orchestrate tools for real-world agentic tasks, based on signals like tool reliability, task completion, and steerability.)<p>Top 10, Highest rank to lowest<p><em>Claude</em> <em>Fable</em> <em>5</em> (High), <em>Claude</em> Opus 4.8 (Thinking), GPT <em>5</em>.<em>5</em> (xHigh), <em>Claude</em> Opus 4.7 (Thinking), GPT <em>5</em>.<em>5</em> (High), <em>Claude</em> Opus 4.7, <em>Claude</em> Opus 4.6, GPT <em>5</em>.<em>5</em>, GPT <em>5</em>.4 (High), GLM <em>5</em>.2 (Max)<p>Text Arena\nView overall rankings across various AI models in text-to-text tasks across math, coding, creative writing, and other open-ended domains.<p>Top 10, Highest rank to lowest<p><em>claude</em>-<em>fable</em>-<em>5</em>, <em>claude</em>-opus-4-6-thinking, <em>claude</em>-opus-4-7-thinking, <em>claude</em>-opus-4-6, <em>claude</em>-opus-4-7, muse-spark, gemini-3.1-pro-preview, gemini-3-pro, <em>claude</em>-opus-4-8-thinking, gpt-<em>5</em>.<em>5</em>-high"},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["5"],"value":"Previewing GPT\u2011<em>5</em>.6 Sol: a next-generation model"},"story_url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["5"],"value":"https://openai.com/index/previewing-gpt-<em>5</em>-6-sol/"}},"_tags":["comment","author_firasd","story_48689028"],"author":"firasd","children":[48691250,48692395],"comment_text":"Some interesting stats here about the current landscape <a href=\"https:&#x2F;&#x2F;arena.ai&#x2F;leaderboard&#x2F;agent\" rel=\"nofollow\">https:&#x2F;&#x2F;arena.ai&#x2F;leaderboard&#x2F;agent</a><p>Agent Arena (Dynamic ranking of models on how well they orchestrate tools for real-world agentic tasks, based on signals like tool reliability, task completion, and steerability.)<p>Top 10, Highest rank to lowest<p>Claude Fable 5 (High), Claude Opus 4.8 (Thinking), GPT 5.5 (xHigh), Claude Opus 4.7 (Thinking), GPT 5.5 (High), Claude Opus 4.7, Claude Opus 4.6, GPT 5.5, GPT 5.4 (High), GLM 5.2 (Max)<p>Text Arena\nView overall rankings across various AI models in text-to-text tasks across math, coding, creative writing, and other open-ended domains.<p>Top 10, Highest rank to lowest<p>claude-fable-5, claude-opus-4-6-thinking, claude-opus-4-7-thinking, claude-opus-4-6, claude-opus-4-7, muse-spark, gemini-3.1-pro-preview, gemini-3-pro, claude-opus-4-8-thinking, gpt-5.5-high","created_at":"2026-06-26T17:39:34Z","created_at_i":1782495574,"objectID":"48689498","parent_id":48689028,"story_id":48689028,"story_title":"Previewing GPT\u20115.6 Sol: a next-generation model","story_url":"https://openai.com/index/previewing-gpt-5-6-sol/","updated_at":"2026-06-26T21:47:26Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"simonw"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"<p><pre><code>  ~ % uvx agentsview session usage be8850a7-6119-46a0-b5d6-79c7fff5ae2b\n  Session:       be8850a7-6119-46a0-b5d6-79c7fff5ae2b\n  Agent:         <em>claude</em>\n  Output:        68606\n  Peak ctx:      113178\n  Cost:          ~$12.11 (<em>claude</em>-<em>fable</em>-<em>5</em>, <em>claude</em>-opus-4-8)</code></pre>"},"story_title":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable","claude"],"value":"<em>Claude</em> <em>Fable</em> is relentlessly proactive"},"story_url":{"fullyHighlighted":false,"matchLevel":"partial","matchedWords":["fable"],"value":"https://simonwillison.net/2026/Jun/11/<em>fable</em>-is-relentlessly-proactive/"}},"_tags":["comment","author_simonw","story_48498573"],"author":"simonw","children":[48499420,48506859],"comment_text":"<p><pre><code>  ~ % uvx agentsview session usage be8850a7-6119-46a0-b5d6-79c7fff5ae2b\n  Session:       be8850a7-6119-46a0-b5d6-79c7fff5ae2b\n  Agent:         claude\n  Output:        68606\n  Peak ctx:      113178\n  Cost:          ~$12.11 (claude-fable-5, claude-opus-4-8)</code></pre>","created_at":"2026-06-12T02:54:38Z","created_at_i":1781232878,"objectID":"48499326","parent_id":48499120,"story_id":48498573,"story_title":"Claude Fable is relentlessly proactive","story_url":"https://simonwillison.net/2026/Jun/11/fable-is-relentlessly-proactive/","updated_at":"2026-06-12T21:58:20Z"},{"_highlightResult":{"author":{"matchLevel":"none","matchedWords":[],"value":"maxloh"},"comment_text":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"I just tried using <em>Fable</em> <em>5</em> with <em>Claude</em> Code by asking it to create a LaTeX document for me.<p>There is no LaTeX compiler installed on my machine. It seems that <em>Fable</em> <em>5</em> is smart enough to download a compiler engine for me, and it kindly runs that remote binary without asking me first :)<p><pre><code>  Support files are in place. No LaTeX compiler on PATH \u2014 let me check for a MiKTeX/TeX Live install elsewhere before writing the deck.\n  \n  Ran 2 commands\n  \n  Ran Search common LaTeX install locations\n  Bash\n  ls &quot;/c/Program Files/MiKTeX&quot;*/miktex/bin/x64 2&gt;/dev/null | head -<em>5</em>; ls &quot;/c/Users/[retracted]/AppData/Local/Programs/MiKTeX/miktex/bin/x64&quot; 2&gt;/dev/null | head -<em>5</em>; ls /c/texlive/*/bin/windows 2&gt;/dev/null | head -<em>5</em>; ls /d/texlive /d/&quot;Program Files&quot;/MiKTeX 2&gt;/dev/null | head; which tectonic latexmk 2&gt;/dev/null; echo done\n  done\n  \n  Ran Download portable Tectonic LaTeX engine\n  Bash\n  cd /tmp &amp;&amp; curl -sL -o tectonic.zip &quot;https://github.com/tectonic-typesetting/tectonic/releases/download/tectonic%400.15.0/tectonic-0.15.0-x86_64-pc-windows-msvc.zip&quot; &amp;&amp; unzip -o tectonic.zip &amp;&amp; ./tectonic.exe --version\n  Archive:  tectonic.zip\n  Created by Cranko\n    inflating: tectonic.exe            \n  tectonic 0.15.0Tectonic 0.15.0\n  \n  Tectonic works. Now writing the bibliography and the full deck.\n</code></pre>\nOpus 4.8 would just proceed without a compiler.<p><pre><code>  Ran a command, used a tool\n\n  Ran Check for LaTeX toolchain availability\n\n  Bash\n  cd &quot;C:/Users/Mon/Downloads/Technical Writing&quot; &amp;&amp; for c in pdflatex xelatex latexmk bibtex; do printf &quot;%s: &quot; &quot;$c&quot;; command -v $c || echo &quot;NOT FOUND&quot;; done\n  pdflatex: NOT FOUND\n  xelatex: NOT FOUND\n  latexmk: NOT FOUND\n  bibtex: NOT FOUND\n  \n  Used PowerShell\n  command: $cmds = @('pdflatex','xelatex','lualatex','latexmk','bibtex','miktex','tlmgr'); foreach ($c in $cmds) { $p = Get-Command $c -ErrorAction SilentlyContinue; if ($p) { &quot;{0}: {1}&quot; -f $c, $p.Source } else { &quot;{0}: NOT FOUND&quot; -f $c } }\n  description: Check for LaTeX engines on Windows PATH\n  pdflatex: NOT FOUND\n  xelatex: NOT FOUND\n  lualatex: NOT FOUND\n  latexmk: NOT FOUND\n  bibtex: NOT FOUND\n  miktex: NOT FOUND\n  tlmgr: NOT FOUND\n\n  No LaTeX engine is installed locally, so I can't produce a PDF here \u2014 I did a careful structural review against the two prior (working) decks instead. The deck is written to disk and mirrors their template exactly. Here is the deliverable.</code></pre>"},"story_title":{"fullyHighlighted":true,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"<em>Claude</em> <em>Fable</em> <em>5</em>"},"story_url":{"fullyHighlighted":false,"matchLevel":"full","matchedWords":["fable","5","claude"],"value":"https://www.anthropic.com/news/<em>claude</em>-<em>fable</em>-<em>5</em>-mythos-<em>5</em>"}},"_tags":["comment","author_maxloh","story_48463808"],"author":"maxloh","comment_text":"I just tried using Fable 5 with Claude Code by asking it to create a LaTeX document for me.<p>There is no LaTeX compiler installed on my machine. It seems that Fable 5 is smart enough to download a compiler engine for me, and it kindly runs that remote binary without asking me first :)<p><pre><code>  Support files are in place. No LaTeX compiler on PATH \u2014 let me check for a MiKTeX&#x2F;TeX Live install elsewhere before writing the deck.\n  \n  Ran 2 commands\n  \n  Ran Search common LaTeX install locations\n  Bash\n  ls &quot;&#x2F;c&#x2F;Program Files&#x2F;MiKTeX&quot;*&#x2F;miktex&#x2F;bin&#x2F;x64 2&gt;&#x2F;dev&#x2F;null | head -5; ls &quot;&#x2F;c&#x2F;Users&#x2F;[retracted]&#x2F;AppData&#x2F;Local&#x2F;Programs&#x2F;MiKTeX&#x2F;miktex&#x2F;bin&#x2F;x64&quot; 2&gt;&#x2F;dev&#x2F;null | head -5; ls &#x2F;c&#x2F;texlive&#x2F;*&#x2F;bin&#x2F;windows 2&gt;&#x2F;dev&#x2F;null | head -5; ls &#x2F;d&#x2F;texlive &#x2F;d&#x2F;&quot;Program Files&quot;&#x2F;MiKTeX 2&gt;&#x2F;dev&#x2F;null | head; which tectonic latexmk 2&gt;&#x2F;dev&#x2F;null; echo done\n  done\n  \n  Ran Download portable Tectonic LaTeX engine\n  Bash\n  cd &#x2F;tmp &amp;&amp; curl -sL -o tectonic.zip &quot;https:&#x2F;&#x2F;github.com&#x2F;tectonic-typesetting&#x2F;tectonic&#x2F;releases&#x2F;download&#x2F;tectonic%400.15.0&#x2F;tectonic-0.15.0-x86_64-pc-windows-msvc.zip&quot; &amp;&amp; unzip -o tectonic.zip &amp;&amp; .&#x2F;tectonic.exe --version\n  Archive:  tectonic.zip\n  Created by Cranko\n    inflating: tectonic.exe            \n  tectonic 0.15.0Tectonic 0.15.0\n  \n  Tectonic works. Now writing the bibliography and the full deck.\n</code></pre>\nOpus 4.8 would just proceed without a compiler.<p><pre><code>  Ran a command, used a tool\n\n  Ran Check for LaTeX toolchain availability\n\n  Bash\n  cd &quot;C:&#x2F;Users&#x2F;Mon&#x2F;Downloads&#x2F;Technical Writing&quot; &amp;&amp; for c in pdflatex xelatex latexmk bibtex; do printf &quot;%s: &quot; &quot;$c&quot;; command -v $c || echo &quot;NOT FOUND&quot;; done\n  pdflatex: NOT FOUND\n  xelatex: NOT FOUND\n  latexmk: NOT FOUND\n  bibtex: NOT FOUND\n  \n  Used PowerShell\n  command: $cmds = @(&#x27;pdflatex&#x27;,&#x27;xelatex&#x27;,&#x27;lualatex&#x27;,&#x27;latexmk&#x27;,&#x27;bibtex&#x27;,&#x27;miktex&#x27;,&#x27;tlmgr&#x27;); foreach ($c in $cmds) { $p = Get-Command $c -ErrorAction SilentlyContinue; if ($p) { &quot;{0}: {1}&quot; -f $c, $p.Source } else { &quot;{0}: NOT FOUND&quot; -f $c } }\n  description: Check for LaTeX engines on Windows PATH\n  pdflatex: NOT FOUND\n  xelatex: NOT FOUND\n  lualatex: NOT FOUND\n  latexmk: NOT FOUND\n  bibtex: NOT FOUND\n  miktex: NOT FOUND\n  tlmgr: NOT FOUND\n\n  No LaTeX engine is installed locally, so I can&#x27;t produce a PDF here \u2014 I did a careful structural review against the two prior (working) decks instead. The deck is written to disk and mirrors their template exactly. Here is the deliverable.</code></pre>","created_at":"2026-06-09T18:49:50Z","created_at_i":1781030990,"objectID":"48465730","parent_id":48463808,"story_id":48463808,"story_title":"Claude Fable 5","story_url":"https://www.anthropic.com/news/claude-fable-5-mythos-5","updated_at":"2026-06-09T20:46:22Z"}],"hitsPerPage":20,"nbHits":1625,"nbPages":50,"page":0,"params":"query=Fable+5+Claude&advancedSyntax=true&analyticsTags=backend","processingTimeMS":19,"processingTimingsMS":{"_request":{"roundTrip":16},"afterFetch":{"format":{"highlighting":1,"total":1},"merge":{"mergeLoop":{"prepareNextHit":1,"total":1},"total":1},"total":1},"fetch":{"query":4,"scanning":13,"total":18},"total":19},"query":"Fable 5 Claude","serverTimeMS":21}
