Unsupported parameter: 'reasoning.summary' is not supported with the 'gpt-5.3-codex-spark' model.
Open 💬 13 comments Opened Jul 10, 2026 by zhanglei-workspace
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of the Codex App are you using (From “About Codex” dialog)?
The latest version of Codex
What subscription do you have?
Unsupported parameter: 'reasoning.summary' is not supported with the 'gpt-5.3-codex-spark' model.
What platform is your computer?
_No response_
What issue are you seeing?
None of the reasoning options are available for the gpt-5.3-codex-spark model.
What steps can reproduce the bug?
just open it
What is the expected behavior?
_No response_
Additional information
_No response_
13 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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I meet the same issue. I'm out of regular token and want to use 5.3 token instead and this error pops up. Please fix it ASAP
I can reproduce this after latest Codex→ChatGPT desktop merge. With normal quota exhausted and spark quota available, using 5.3-codex-spark in merged desktop fails: Unsupported parameter: 'reasoning.summary' is not supported with the 'gpt-5.3-codex-spark' model. CLI does not exhibit this same failure for the same model/account. Seems desktop-only regression in request/metadata path introduced by merge.
I have the same issue, use codex cli no such issue.
Same problem i can't use model spark
@etraut-openai After updating the macOS version of Codex to the latest release, GPT-5.3 Codex Spark is completely broken. Come on, guys—please wake up and get this fixed.
same issue
Same here. Out of quota, really need this model. Reset my quota and I'll forget this bug.
same issue
Still not fixed.
still have this issue.
this is the problem ..... with ai coding ai .... a SIMPLE bug .....
the same issue