github / github/copilot-cli

Execution failed: CAPIError: 400 model "gpt-5.3-codex" is not accessible via the /chat/completions endpoint

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area:models
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Description

### Describe the bug

Get this error when history compaction is executed.

> Compacting conversation history...
>
>✗ Execution failed: CAPIError: 400 model "gpt-5.3-codex" is not accessible via the /chat/completions endpoint
(Request ID: 09BE:1E11:8ED277:ADF0E7:69BCCCCB)

Image

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

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