VS Code extension rejects non-gpt-5 model IDs and overrides Other models config (always calls gpt-5) #2840

What version of Codex is running?

codex-cli 0.23.0

Which model were you using?

No response

What platform is your computer?

No response

What steps can reproduce the bug?

Steps to Reproduce

1. Open VS Code and set the extension to use OpenRouter with the config above.
2. Start a chat or any request from the extension.
3. Check OpenRouter usage dashboard: requests arrive as gpt-5.

What is the expected behavior?

The extension should accept arbitrary model IDs when provider is OpenRouter (e.g., anthropic/claude-sonnet-4, etc.).
Requests should be sent to the configured provider/baseUrl and use the exact model string supplied.

What do you see instead?

Settings validation only accepts "gpt-5" for chatgpt.model.
Extension sends requests to gpt-5 despite provider/model overrides pointing to OpenRouter.

Additional information

No response