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Codex Issues / #26652

reasoning.summary not supported with gpt-5.3-codex-spark

Open 💬 3 comments Opened Jun 5, 2026 by coalio
💡 Likely answer: A maintainer (etraut-openai, contributor) responded on this thread — see the highlighted reply below.

What version of Codex CLI is running?

0.137.0

What subscription do you have?

Pro

Which model were you using?

gpt-5.3.codex-spark

What platform is your computer?

Linux 6.6.87.2-microsoft-standard-WSL2 x86_64 x86_64

What terminal emulator and version are you using (if applicable)?

Neovide

Codex doctor report

What issue are you seeing?

reasoning.summary crashes on models that don't support it or use the older apis

Uploaded thread: 019e98e5-0eeb-70d1-b905-6173572a883c

What steps can reproduce the bug?

Uploaded thread: 019e98e5-0eeb-70d1-b905-6173572a883c

What is the expected behavior?

_No response_

Additional information

_No response_

View original on GitHub ↗

3 Comments

etraut-openai contributor · 2 months ago

When you say that it "crashes", do you mean that the harness terminates? Or do you mean that an error is reported to the user when this condition occurs? If it's the latter, then that's the expected behavior.

coalio · 2 months ago

@etraut-openai The harness doesn't terminate (as in the CLI exiting), but the user gets the raw API JSON error response, I don't believe this is intended except for the error being surfaced. There's a bad parameter being sent from the harness side.

Notifying the user that reasoning summaries will be disabled as they're unsupported by the model would be ideal

<img width="964" height="968" alt="Image" src="https://github.com/user-attachments/assets/9b50255f-40b0-4688-8406-ad0353658ec1" />

michael-jennings · 1 month ago

Note for maintainers: The automated triage run by @ctkm-aelf (FKST-codex-harness#114) improperly marked this issue as needs-info and closed the saga tracking.

The reproduction runner collapsed due to a host-level compilation error (ENOSPC / out of disk space) while building codex-core, meaning the test never actually ran. The underlying payload gating failure regarding reasoning.summary in codex-rs/core/src/client.rs:790 is valid and has not been evaluated.

The systemic class-wide leak where runner infrastructure falls back to needs-info classification is being tracked at ChronoAIProject/fkst-packages#2168.