copilot: unsupported_api_for_model

[Adphi]

Describe the bug

all models failed: error receiving from stream: HTTP 400: POST "https://api.githubcopilot.com/chat/completions": 400 Bad Request {"message":"model "gpt-5.3-codex" is not accessible via the /chat/completions endpoint","code":"unsupported_api_for_model"}

Version affected

$ docker-agent version
docker-agent version v1.40.0
Commit: Homebrew

How To Reproduce

1. Export the GITHUB_TOKEN env variable:

   $ export GITHUB_TOKEN=$(gh auth token)
   

2. Select the github-copilot/gpt-5.3-codex model
3. Ask anything to the agent
4. See error

[joshbarrington]

Are you using your own defined agent .yaml file?

I tested this and it works if you specify the api_type as openapi_response

models:
  gpt-5-codex:
    provider: github-copilot
    model: gpt-5.3-codex
    provider_opts:
      api_type: openai_responses

agents:
  root:
    model: gpt-5-codex