SSH session in ChatGPT macOS app on Intel MacBook Pro fails with unsupported reasoning.summary on gpt-5.3-codex-spark

What issue are you seeing?

When I use Codex through the ChatGPT macOS app over SSH on an Intel-based x86 MacBook Pro, requests fail with:

Unsupported parameter: 'reasoning.summary' is not supported with the 'gpt-5.3-codex-spark' model.

This appears to mean the current Codex app/server flow is sending a reasoning.summary parameter for a model that does not support it.

What steps can reproduce the bug?

1. Open the ChatGPT macOS app on an Intel-based x86 MacBook Pro.
2. Start a Codex session that uses SSH.
3. Use the current Codex app/server version and send a request that targets gpt-5.3-codex-spark.
4. Observe the request failure.

What did you expect to happen?

The SSH-backed Codex session should work normally, or the app/server should avoid sending unsupported parameters for gpt-5.3-codex-spark.

What actually happened?

The request fails immediately with:

Unsupported parameter: 'reasoning.summary' is not supported with the 'gpt-5.3-codex-spark' model.

Environment

• ChatGPT macOS app
• Codex via SSH
• Intel-based x86 MacBook Pro
• Model: gpt-5.3-codex-spark

Additional context

This looks like a client/server compatibility issue where the request payload includes reasoning.summary even though that field is not supported by this model.