GitHub Copilot CLI in Model mode Auto returns error if you are using /btw or /ask command

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#4,887 opened on Sep 17, 2026 3 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 58/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Active
Tech stack: shell
Domain: cli

Research direction

Reproduce the issue in GitHub Copilot CLI 1.0.86-2 by selecting Auto with /model, then running /btw or /ask with a prompt in PowerShell or WSL Linux. Compare this with an explicitly selected model; done means both commands work with Auto without the 400 unsupported-model error.

Written by the indexing model from the issue text.

Description

triage

Describe the bug

GitHub Copilot in Model mode Auto returns error if you are using /btw or /ask command using any particular model has no issues

Affected version

GitHub Copilot CLI 1.0.86-2

Steps to reproduce the behavior

/model and chose select Auto
/btw or /ask any prompt this is test
error : host-rethrow: 400 The requested model is not supported.
4 /model select any model
/btw or /ask any prompt this is test
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Expected behavior

expected behavior that it will work similar and use auto selected model for the /ask

Additional context

Tested on Windows Powershell and in wsl Linux

Dominant language: Shell
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Forks: 1.9k
Avg merge: 14h 16m
Merged PRs (30d): 6

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