Copilot Does Not Change Model

[larrydanna]

Describe the bug

When attempting to change the AI model in GitHub Copilot Chat within VS Code, the model does not change.

Affected version

GitHub Copilot CLI 1.0.19

Steps to reproduce the behavior

1. Open Copilot in VSCode or CLI in terminal
2. use /model command
3. Click the model selector dropdown
4. Select a different model from the list
5. Observe that the model is unchanged

Expected behavior

The newly selected model should be saved and used for subsequent Copilot Chat responses. The model selector should reflect the
chosen model persistently.

Additional context

• Current Model: Claude Sonnet 4.6 (medium)
• Editor: Visual Studio Code
• Extension: GitHub Copilot / GitHub Copilot Chat
• The issue occurs each time a model change is attempted; the selection does not stick
• Workstation also has Claude Code, gstack