github copilot: gpt-5-mini not supported via responses api #4943

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1. frap129

   added

   bugSomething isn't workingSomething isn't working

   on Dec 1, 2025
2. github-actions

   added

   opentuiThis relates to changes in v1.0, now that opencode uses opentuiThis relates to changes in v1.0, now that opencode uses opentui

   on Dec 1, 2025
3. github-actions commented on Dec 1, 2025

   

   github-actionsBot

   on Dec 1, 2025 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • gpt-5-codex through GitHub Copilot provider returns API call error #2890: gpt-5-codex through GitHub Copilot provider returns API call error - discusses gpt-5 model variants requiring the /responses API endpoint instead of /chat/completions
   • Error using gpt-5.1-codex via Github Copilot #4561: Error using gpt-5.1-codex via Github Copilot - similar model endpoint compatibility issue with GitHub Copilot provider
   • "The requested model is not supported." and "model gpt-5.1-codex is not accessible via the /chat/completions endpoint" for github copilot provider #4819: Model not supported errors and gpt-5.1-codex endpoint issues with GitHub Copilot provider
   • GitHub Copilot integration: Missing custom loader in provider.ts #3019: GitHub Copilot integration missing from CUSTOM_LOADERS in provider.ts - broader context on GitHub Copilot model support

   These issues discuss the same underlying problem where certain gpt-5 model variants (including gpt-5-mini) require special endpoint handling for GitHub Copilot. Feel free to ignore if this specific case differs from those issues.
4. rekram1-node commented on Dec 1, 2025

   

   rekram1-node

   on Dec 1, 2025

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   lol whoops ill fix
5. frap129 commented on Dec 1, 2025

   

   frap129

   on Dec 1, 2025

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   fwiw, I tried the rest of the gpt-5 models on github copilot and the rest work fine
6. rekram1-node

   removed

   opentuiThis relates to changes in v1.0, now that opencode uses opentuiThis relates to changes in v1.0, now that opencode uses opentui

   on Dec 1, 2025
7. rekram1-node

   self-assigned this

   on Dec 1, 2025
8. rekram1-node commented on Dec 1, 2025

   

   rekram1-node

   on Dec 1, 2025

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   @frap129 hmmm this is weird it works via responses for me
9. rekram1-node commented on Dec 1, 2025

   

   rekram1-node

   on Dec 1, 2025

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   @frap129 can you do:

   cat ~/.cache/opencode/version
   (cd ~/.cache/opencode && BUN_BE_BUN=1 opencode list)
   

   and show me output
10. frap129 commented on Dec 1, 2025

    

    frap129

    on Dec 1, 2025

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    ❯ cat ~/.cache/opencode/version
    (cd ~/.cache/opencode && BUN_BE_BUN=1 opencode list)
    12
    /home/joe/.cache/opencode node_modules (134)
    ├── opencode-anthropic-auth@0.0.3
    ├── opencode-copilot-auth@0.0.7
    └── opencode-skills@0.1.0
    
11. rekram1-node commented on Dec 1, 2025

    

    rekram1-node

    on Dec 1, 2025

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    fixed in next release:
    f1bb587

    🎉React with 🎉2Reacted by Joe Maples and Paweł Przytuła
12. rekram1-node

    closed this as completedon Dec 1, 2025