Execution failed: CAPIError: 400 model "claude-opus-4.6" not supported for vision

### Describe the bug

Execution failed: CAPIError: 400 model "claude-opus-4.6" not supported for vision getting this issue for all teh prompts , how to make thsi session to come out of this issue

### Affected version

_No response_

### Steps to reproduce the behavior

In github copilot cli ,

- Include an image content block type.
- Ask coplot to review teh image

### Expected behavior

Getting this Execution failed: CAPIError: 400 model "claude-opus-4.6" not supported for vision

### Additional context

Unable to get rid of this issue and tried to restart teh sessiion , chnage the model to claude opus , gpt but results is same

Start by reproducing the image review flow in GitHub Copilot CLI with an image content block and the affected model selections. Trace how the session chooses a vision model and verify that image prompts either use a supported model or return a clear recovery path instead of the 400 error.

Scritto dal modello di indicizzazione a partire dal testo della issue.