Describe the bug
I’m experiencing a consistent backend routing issue with GitHub Copilot CLI (v1.0.21) on my student Copilot plan.
The Copilot CLI presents and attempts to use models that my plan does not appear to be entitled to (e.g. Claude Sonnet / Opus 4.x and GPT‑5.x). Selecting any of these models — including the default selection — results in:
CAPIError: 400 The requested model is not supported
Using /model in the CLI shows mismatched availability vs. support. For example, models like gpt-5.4 are listed as supported, but attempting to use them immediately fails with the above error.
This suggests a model entitlement / routing issue for Copilot CLI specifically, as Copilot works as expected in IDEs (e.g. VS Code).
I believe my Copilot CLI session is being routed to models that are not permitted for student plans, instead of falling back to a supported model (e.g. GPT‑4.1 / Copilot default).
Request:
Please review and correct the Copilot CLI model routing for my account so that only student‑eligible Copilot models are used.
Environment:
OS: Windows (PowerShell)
GitHub Copilot CLI: 1.0.21
Plan: GitHub Copilot Student
Recent Request IDs:
E724:21FE53:233752:26D514:69D790D1
(additional IDs available if needed)
Thanks in advance for your help.
Affected version
No response
Steps to reproduce the behavior
No response
Expected behavior
No response
Additional context
No response
Describe the bug
I’m experiencing a consistent backend routing issue with GitHub Copilot CLI (v1.0.21) on my student Copilot plan.
The Copilot CLI presents and attempts to use models that my plan does not appear to be entitled to (e.g. Claude Sonnet / Opus 4.x and GPT‑5.x). Selecting any of these models — including the default selection — results in:
CAPIError: 400 The requested model is not supported
Using /model in the CLI shows mismatched availability vs. support. For example, models like gpt-5.4 are listed as supported, but attempting to use them immediately fails with the above error.
This suggests a model entitlement / routing issue for Copilot CLI specifically, as Copilot works as expected in IDEs (e.g. VS Code).
I believe my Copilot CLI session is being routed to models that are not permitted for student plans, instead of falling back to a supported model (e.g. GPT‑4.1 / Copilot default).
Request:
Please review and correct the Copilot CLI model routing for my account so that only student‑eligible Copilot models are used.
Environment:
OS: Windows (PowerShell)
GitHub Copilot CLI: 1.0.21
Plan: GitHub Copilot Student
Recent Request IDs:
E724:21FE53:233752:26D514:69D790D1
(additional IDs available if needed)
Thanks in advance for your help.
Affected version
No response
Steps to reproduce the behavior
No response
Expected behavior
No response
Additional context
No response