lm-sys / lm-sys/FastChat

Claude opus models not available

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#3,832 2 comments 0 reactions 0 assignees View on GitHub

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Python
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Description

Greetings lmarena team, yesterday I was using direct chat with Claude opus 4.6, but I today I couldn't find it anywhere in the website. Neither can I find opus 4.5 or any other opus model. I don't know if it's a issue on my end, or what. But I think opus models are gone. Can you please fix that? Thanks.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the missing Claude Opus models in the lmarena website and compare the currently available model list with the reported absence of Opus 4.6, 4.5, and other Opus models. Done means the affected models are visible and selectable again, or the issue identifies why they are unavailable.

Written by the indexing model from the issue text.

Assessment

Domain
ai
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
38/100

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