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[Bug]: Unable to use GPT-5 Codex from GitHub Copilot #10560
Description
Issue Checklist
- I understand that issues are for feedback and problem solving, not for complaining in the comment section, and will provide as much information as possible to help solve the problem.
- My issue is not listed in the FAQ.
- I've looked at pinned issues and searched for existing Open Issues, Closed Issues, and Discussions, no similar issue or discussion was found.
- I've filled in short, clear headings so that developers can quickly identify a rough idea of what to expect when flipping through the list of issues. And not "a suggestion", "stuck", etc.
- I've confirmed that I am using the latest version of Cherry Studio.
Platform
macOS
Version
v1.6.2
Bug Description
GPT-5 Codex from GitHub Copilot is currently unsupported. The error message says "model gpt-5-codex is not supported in this VS Code version. Please update it to version 1.104.1 or newer".
According to the discussion at zed-industries/zed#38858, /responses endpoint should be used for GPT-5 Codex from GitHub Copilot instead of /chat/completion endpoint.
Steps To Reproduce
- Set up GitHub Copilot Provider
- Add the model with ID
gpt-5-codex - Send a random message to it
- Encounter error
Expected Behavior
The model should respond normally like other models.
Relevant Log Output
Error name: AI_APICallError
Error Message: model gpt-5-codex is not supported in this VS Code version. Please update it to version 1.104.1 or newer
Stack Trace: AI_APICallError: model gpt-5-codex is not supported in this VS Code version. Please update it to version 1.104.1 or newer
at file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/dist-DljPbAPG.js:4456:11
at async postToApi (file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/dist-DljPbAPG.js:4352:24)
at async OpenAICompatibleChatLanguageModel.doStream (file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/store-D-H00nsq.js:48200:48)
at async wrapStream (file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/store-D-H00nsq.js:41532:31)
at async fn (file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/store-D-H00nsq.js:39723:17)
at async file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/store-D-H00nsq.js:37132:19
at async _retryWithExponentialBackoff (file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/store-D-H00nsq.js:37234:10)
at async streamStep (file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/store-D-H00nsq.js:39691:108)
at async fn (file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/store-D-H00nsq.js:39970:5)
at async file:///Applications/Cherry%20Studio.app/Contents/Resources/app.asar/out/renderer/assets/store-D-H00nsq.js:37132:19
Error cause: "[undefined]"
Status Code: 400
Request URL: https://api.githubcopilot.com/chat/completions
Request Body Values: {
"model": "gpt-5-codex",
"user": "[undefined]",
"max_tokens": "[undefined]",
"temperature": "[undefined]",
"top_p": "[undefined]",
"frequency_penalty": "[undefined]",
"presence_penalty": "[undefined]",
"response_format": "[undefined]",
"stop": "[undefined]",
"seed": "[undefined]",
"reasoning_effort": "[undefined]",
"serviceTier": "[undefined]",
"messages": [
{
"role": "user",
"content": "hi"
}
],
"tools": "[undefined]",
"tool_choice": "[undefined]",
"stream": true,
"stream_options": {
"include_usage": true
}
}
Response Header: {
"content-length": "169",
"content-type": "text/plain; charset=utf-8",
"date": "Tue, 07 Oct 2025 12:55:16 GMT",
"strict-transport-security": "max-age=31536000",
"x-content-type-options": "nosniff",
"x-github-backend": "Kubernetes",
"x-github-request-id": "E257:2E82E8:331F5CD:3D4DD15:68E50DB4",
"x-request-id": "00000-9449d4ca-d4b6-4465-967c-6eb45d2dff45"
}
Response Body: {
"error": {
"message": "model gpt-5-codex is not supported in this VS Code version. Please update it to version 1.104.1 or newer",
"code": "model_not_supported_in_version"
}
}
Data: {
"error": {
"message": "model gpt-5-codex is not supported in this VS Code version. Please update it to version 1.104.1 or newer",
"code": "model_not_supported_in_version"
}
}Additional Context
No response
Reacted by dosubot
Activity
ous50 commentedon Oct 7, 2025
This is interesting. I may like to have a look, although I am not familiar with OpenAI response format. Just to confirm, is
gpt-5-codexthe only model that requires/supports response format?PeronGH commentedon Oct 7, 2025
According to OpenAI docs, both GPT-5 Codex and GPT-5 Pro do not support the
/chat/completionsendpoint and only support the/responsesendpoint. I guess GitHub Copilot is forced to use the/responsesendpoint for GPT-5 Codex due to this.