Source 2: I work on AI at Meta.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:30:48.000Z","created_at_i":1790364648,"id":49848881,"options":[],"parent_id":49848431,"points":null,"story_id":49848095,"text":"I'm not no. Someone from meta would have to chime in... but its very openai shaped and served differently from all the other models listed in the daemon, under a mysterious name.
a fine-tuned OpenAI model on Azure for the purpose of compaction or something could make sense I guess but that would still be OpenAI's weights with meta ontop, and they already have a compaction model served under azure/avocado-compaction-v1","title":null,"type":"comment","url":null},{"author":"vineyardmike","children":[{"author":"jychang","children":[{"author":"vineyardmike","children":[],"created_at":"2026-09-26T20:36:39.000Z","created_at_i":1790454999,"id":49860299,"options":[],"parent_id":49855408,"points":null,"story_id":49848095,"text":"Thanks for the links to the \u201ccompletions\u201d APIs that are common. Not the \u201cresponses\u201d API I\u2019m talking about, however.","title":null,"type":"comment","url":null}],"created_at":"2026-09-26T11:11:46.000Z","created_at_i":1790421106,"id":49855408,"options":[],"parent_id":49849361,"points":null,"story_id":49848095,"text":"> The Muse public APIs seem to be heavily inspired by OpenAI's, they even support the richer "responses" API.
???
Every single provider basically copy openai's api endpoint
https://api.openai.com/v1/chat/completions
https://router.huggingface.co/v1/chat/completions
https://integrate.api.nvidia.com/v1/chat/completions
https://generativelanguage.googleapis.com/v1beta/openai/chat...
https://api.x.ai/v1/chat/completions
https://api.deepseek.com/chat/completions
https://openrouter.ai/api/v1/chat/completions
https://opencode.ai/zen/v1/chat/completions
https://api.cerebras.ai/v1/chat/completions
Saying "Muse's public APIs seem heavily inspired by OpenAI" is like saying "a web server\u2019s API seems heavily inspired by HTTP".\nOpenAI\u2019s API format has become an industry standard.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T20:16:51.000Z","created_at_i":1790367411,"id":49849361,"options":[],"parent_id":49848431,"points":null,"story_id":49848095,"text":"This feels like the far more likely option.
The Muse public APIs seem to be heavily inspired by OpenAI's, they even support the richer "responses" API. They have a similarly shaped compaction API, they have the same "encrypted" reasoning. Even the Muse harness seems heavily inspired by (open source) Codex. Considering Azure's historic involvement w/ OpenAI, it seems more plausible that Azure is used as spill-over capacity, and the same Azure infra used to encrypt GPT models encrypts Muse models.
My guess that the generally visible Anthropic/OpenAI details are leftovers from the whole meta "move fast" behavior. There are a few rough edges on the product where it leaks internal codenames (eg. signing in w/ WhatsApp required consenting to using "hatch" on one screen), so I'd believe that this was a leftover on the VM from the prototyping stage, before the Muse models were ready, or because the dev's got to benchmark against different models.","title":null,"type":"comment","url":null},{"author":"binlog","children":[{"author":"xmcp123","children":[{"author":"thinkling","children":[{"author":"losteric","children":[{"author":"cma","children":[],"created_at":"2026-09-26T00:34:26.000Z","created_at_i":1790382866,"id":49851917,"options":[],"parent_id":49850464,"points":null,"story_id":49848095,"text":"Weren't they planning to sell their compute? https://www.bloomberg.com/news/articles/2026-07-01/meta-is-b...
I guess at peak times they might need more to the extent they offload to azure and still sell excess off peak, or some announced partners required all data stay on azure?","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T21:54:23.000Z","created_at_i":1790373263,"id":49850464,"options":[],"parent_id":49850404,"points":null,"story_id":49848095,"text":"GPU compute capacity?","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T21:46:13.000Z","created_at_i":1790372773,"id":49850404,"options":[],"parent_id":49850151,"points":null,"story_id":49848095,"text":"I think they were asking, "If this is a model produced by Meta with an API designed to be compatible with OpenAI models, but it's not actually an OpenAI model, why is Meta hosting it on Azure?"","title":null,"type":"comment","url":null},{"author":"meredithbloom","children":[{"author":"throw03172019","children":[],"created_at":"2026-09-25T23:57:13.000Z","created_at_i":1790380633,"id":49851687,"options":[],"parent_id":49851366,"points":null,"story_id":49848095,"text":"Haven\u2019t they been transitioning to Azure?","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T23:22:52.000Z","created_at_i":1790378572,"id":49851366,"options":[],"parent_id":49850151,"points":null,"story_id":49848095,"text":"Microsoft owns 100% of GitHub and that's hosted on AWS...","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T21:25:19.000Z","created_at_i":1790371519,"id":49850151,"options":[],"parent_id":49849519,"points":null,"story_id":49848095,"text":"Microsoft owns 27% of OpenAI.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T20:29:32.000Z","created_at_i":1790368172,"id":49849519,"options":[],"parent_id":49848431,"points":null,"story_id":49848095,"text":"Why host it on Azure though?","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T18:50:52.000Z","created_at_i":1790362252,"id":49848431,"options":[],"parent_id":49848096,"points":null,"story_id":49848095,"text":"Nice work!
Are you sure this isn't just a custom model that is API-compatible with OpenAI?","title":null,"type":"comment","url":null},{"author":"alexgoodhart","children":[],"created_at":"2026-09-25T20:13:27.000Z","created_at_i":1790367207,"id":49849315,"options":[],"parent_id":49848096,"points":null,"story_id":49848095,"text":"What endpoint would Claude be calling?","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T18:18:06.000Z","created_at_i":1790360286,"id":49848096,"options":[],"parent_id":49848095,"points":null,"story_id":49848095,"text":"author here. I kept digging through the Muse filesystem after my first post hit the front page here this week.
Going through my logs I found a background agent that used a model called azure/muse-special while building my website. I found this interesting and dug a little deeper.
The transcript and daemon binary point to an OpenAI model running on Azure. Still unclear which one or why it was selected.
The runtime also ships with an Anthropic client and a catalogue listing Claude, GPT and Kimi models. I didn\u2019t observe Claude being used in my own sessions, but this is my Part 2 of exploring the Muse file system.
original post: https://x.com/heypeterjames/status/2103545183400800746
pete at mouse dot dev","title":null,"type":"comment","url":null},{"author":"Tiberium","children":[{"author":"Aeroi","children":[{"author":"catchnear4321","children":[],"created_at":"2026-09-25T19:19:07.000Z","created_at_i":1790363947,"id":49848743,"options":[],"parent_id":49848553,"points":null,"story_id":49848095,"text":"router makes sense. fill a gap with someone else\u2019s model wearing a mask, swap it out with your model not wearing a mask when (or if) you reach that.
definitely tracks with alexandr\u2019s hand-wavey influencer turn.","title":null,"type":"comment","url":null},{"author":"VygmraMGVl","children":[],"created_at":"2026-09-25T20:43:24.000Z","created_at_i":1790369004,"id":49849705,"options":[],"parent_id":49848553,"points":null,"story_id":49848095,"text":"Avocado and Muse are different models. Muse uses the openAI API.
https://dev.meta.ai/docs/overview
Source: I work on AI at Meta.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:01:48.000Z","created_at_i":1790362908,"id":49848553,"options":[],"parent_id":49848445,"points":null,"story_id":49848095,"text":"Meta already serves its own models on Azure under their real names. azure/avocado-compaction-v1 and azure/avocado-memory-flush-v1 are in the same catalog. Those sessions do not come back as gpt_responses_v1 items with rs_ ids and encrypted reasoning.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T18:51:53.000Z","created_at_i":1790362313,"id":49848445,"options":[],"parent_id":49848095,"points":null,"story_id":49848095,"text":"I don't really see evidence that it's an "OpenAI" model, the title is IMO very misleading.","title":null,"type":"comment","url":null},{"author":"GenerWork","children":[{"author":"Aeroi","children":[],"created_at":"2026-09-25T19:11:05.000Z","created_at_i":1790363465,"id":49848663,"options":[],"parent_id":49848615,"points":null,"story_id":49848095,"text":"i agree, and it's what made me spend time exploring today.
fair q. call_ ids and gAAAAA blobs arent damning but the rs_ reasoning ids embed a unix timestamp that matches the session to the second, then OpenAI's 819x marker. plus the summary is in OpenAI's summarizer voice.
its just a best guess.","title":null,"type":"comment","url":null},{"author":"fg137","children":[{"author":"GenerWork","children":[],"created_at":"2026-09-25T22:23:35.000Z","created_at_i":1790375015,"id":49850732,"options":[],"parent_id":49850416,"points":null,"story_id":49848095,"text":">How do you know?
Because there was an article written in Bloomberg about how they're looking to sell their extra compute [0]
[0] https://archive.is/4ODV4","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T21:47:12.000Z","created_at_i":1790372832,"id":49850416,"options":[],"parent_id":49848615,"points":null,"story_id":49848095,"text":"> It can't be that they don't have enough compute.
How do you know?
Every cloud provider (AWS, Azure etc) is struggling with meeting LLM demand.
Source: first hand info","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:06:47.000Z","created_at_i":1790363207,"id":49848615,"options":[],"parent_id":49848095,"points":null,"story_id":49848095,"text":"I'm not sure I understand why they would route it to other models. It can't be that they don't have enough compute. Maybe worried that the answer from their own models would be bad? Doesn't really make sense, but I could be missing something.","title":null,"type":"comment","url":null},{"author":"6thbit","children":[{"author":"meric_","children":[],"created_at":"2026-09-25T19:29:43.000Z","created_at_i":1790364583,"id":49848864,"options":[],"parent_id":49848696,"points":null,"story_id":49848095,"text":"No reason for it to. Software companies use products from other software companeis all the time.","title":null,"type":"comment","url":null},{"author":"micromacrofoot","children":[],"created_at":"2026-09-25T20:03:39.000Z","created_at_i":1790366619,"id":49849210,"options":[],"parent_id":49848696,"points":null,"story_id":49848095,"text":"meta already pays openai and anthropic for employee use despite having their own models available","title":null,"type":"comment","url":null},{"author":"binlog","children":[{"author":"enjoyyourlife","children":[{"author":"JumpCrisscross","children":[{"author":"enjoyyourlife","children":[],"created_at":"2026-09-29T18:42:52.000Z","created_at_i":1790707372,"id":49898360,"options":[],"parent_id":49851769,"points":null,"story_id":49848095,"text":"Forgot that it wasn't public. Then it wouldn't have to disclose anything until the IPO","title":null,"type":"comment","url":null}],"created_at":"2026-09-26T00:09:47.000Z","created_at_i":1790381387,"id":49851769,"options":[],"parent_id":49850547,"points":null,"story_id":49848095,"text":"OpenAI isn\u2019t public. It doesn\u2019t file forms 10-Q.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T22:05:24.000Z","created_at_i":1790373924,"id":49850547,"options":[],"parent_id":49849703,"points":null,"story_id":49848095,"text":"Isn't S-1 just for IPO? Wouldn't it be in the 10-Q?","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T20:43:10.000Z","created_at_i":1790368990,"id":49849703,"options":[],"parent_id":49848696,"points":null,"story_id":49848095,"text":"Depends on the size of the deal. OpenAI would have to disclose it in their S-1 if it crossed the threshold of being material information for investors.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:15:01.000Z","created_at_i":1790363701,"id":49848696,"options":[],"parent_id":49848095,"points":null,"story_id":49848095,"text":"It'd be hilarious that meta chose to pay openai. If there was such a deal, would it come to light in any public/official filings?","title":null,"type":"comment","url":null},{"author":"manav","children":[{"author":"sroussey","children":[{"author":"tclancy","children":[],"created_at":"2026-09-25T19:36:44.000Z","created_at_i":1790365004,"id":49848943,"options":[],"parent_id":49848856,"points":null,"story_id":49848095,"text":"Got Russian from it once. As a child of the '80s I jumped right on it, but the explanation seemed believable.
Still sleeping with one eye open.","title":null,"type":"comment","url":null},{"author":"wincy","children":[{"author":"dgellow","children":[{"author":"xmcp123","children":[],"created_at":"2026-09-25T21:27:09.000Z","created_at_i":1790371629,"id":49850174,"options":[],"parent_id":49849969,"points":null,"story_id":49848095,"text":"It kind of makes sense when you think about it. If the training data is YouTube transcripts, people often abruptly switch from content to asking for a subscription.
If AI is typeahead on crack, then this tracks.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T21:08:03.000Z","created_at_i":1790370483,"id":49849969,"options":[],"parent_id":49848965,"points":null,"story_id":49848095,"text":"I remember getting a bunch of \u201eThanks for watching! Subscribe and smash that like button\u201c in the middle of chat sessions a few times (like, more than 3 times over the past 3y)","title":null,"type":"comment","url":null},{"author":"fg137","children":[{"author":"ccgreg","children":[],"created_at":"2026-09-26T04:32:38.000Z","created_at_i":1790397158,"id":49853227,"options":[],"parent_id":49850368,"points":null,"story_id":49848095,"text":"It's as if Common Crawl is attempting to be a sample of the web.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T21:42:47.000Z","created_at_i":1790372567,"id":49850368,"options":[],"parent_id":49848965,"points":null,"story_id":49848095,"text":"If you ever look at what's in the Common Crawl the amount of Chinese porn crap is jarring.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:38:44.000Z","created_at_i":1790365124,"id":49848965,"options":[],"parent_id":49848856,"points":null,"story_id":49848095,"text":"I had a totally benign chat with OpenAI and it titled it as \u201camateur porn\u201d in Chinese characters, it was very alarmed when I pointed the conversation name out to it. It almost never misses these days, but when it does the failure modes are very strange.","title":null,"type":"comment","url":null},{"author":"ChickeNES","children":[{"author":"arshxyz","children":[{"author":"tehjoker","children":[],"created_at":"2026-09-25T20:53:26.000Z","created_at_i":1790369606,"id":49849812,"options":[],"parent_id":49849081,"points":null,"story_id":49848095,"text":"People that know multiple languages sometimes code switch too funnily enough","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:51:12.000Z","created_at_i":1790365872,"id":49849081,"options":[],"parent_id":49849040,"points":null,"story_id":49848095,"text":"This used to happen a lot with GPT 5.4. It would start outputting entire sentences in Korean for no apparent reason.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:45:36.000Z","created_at_i":1790365536,"id":49849040,"options":[],"parent_id":49848856,"points":null,"story_id":49848095,"text":"A Hindi word in the middle of a normal reply for me (but once I translated the word it was right in context heh)","title":null,"type":"comment","url":null},{"author":"georgemcbay","children":[],"created_at":"2026-09-25T23:59:28.000Z","created_at_i":1790380768,"id":49851704,"options":[],"parent_id":49848856,"points":null,"story_id":49848095,"text":"Not sure what model(s) they use but this recently happened in a TV interview with an "AI actress".
https://www.reddit.com/r/oddlyterrifying/comments/1wljyvf/al...","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:29:13.000Z","created_at_i":1790364553,"id":49848856,"options":[],"parent_id":49848817,"points":null,"story_id":49848095,"text":"I\u2019ve had Claude opus do that too.","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T19:26:04.000Z","created_at_i":1790364364,"id":49848817,"options":[],"parent_id":49848095,"points":null,"story_id":49848095,"text":"Muse 1.3 spark occasionally spits out Chinese character responses to me like internal instructions. \u201cGo fast\u201d or \u201cGet help\u201d\u2026","title":null,"type":"comment","url":null},{"author":"sourcecodeplz","children":[{"author":"binlog","children":[],"created_at":"2026-09-25T21:48:49.000Z","created_at_i":1790372929,"id":49850426,"options":[],"parent_id":49850128,"points":null,"story_id":49848095,"text":"Every engineer at Meta is using Claude (and in some cases Codex) to do their work. Willing to bet that Muse itself was ~100% written by Claude/Codex. Pride goes out of the window when business is involved.","title":null,"type":"comment","url":null},{"author":"alex1138","children":[],"created_at":"2026-09-25T22:43:57.000Z","created_at_i":1790376237,"id":49850937,"options":[],"parent_id":49850128,"points":null,"story_id":49848095,"text":"Pride, as in stealing literally everyone else's products from the time he entered Silicon Valley and before that?","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T21:24:00.000Z","created_at_i":1790371440,"id":49850128,"options":[],"parent_id":49848095,"points":null,"story_id":49848095,"text":"zuck wouldn't do this, he is too proud imho","title":null,"type":"comment","url":null},{"author":"sejje","children":[],"created_at":"2026-09-25T21:33:06.000Z","created_at_i":1790371986,"id":49850255,"options":[],"parent_id":49848095,"points":null,"story_id":49848095,"text":"I thought it was 1.3 spark. No?","title":null,"type":"comment","url":null}],"created_at":"2026-09-25T18:18:06.000Z","created_at_i":1790360286,"id":49848095,"options":[],"parent_id":null,"points":143,"story_id":49848095,"text":null,"title":"Meta's Muse appears to use an OpenAI model labeled muse-special","type":"story","url":"https://mouse.dev/blog/muse-special/"}