AI Model / Codex
Unsupported parameter 'reasoning.summary' when using 'gpt-5.3-codex-spark' model.
Problem statement normalized from the linked evidenceGate decision: Aug 15, 2026
Why the gate is holding
No rejection reason is currently recorded.
Qualification passed. Commercial analysis may still recommend REJECT; only non-rejected, evidence-backed analyses can be published as opportunities.
3 evidence records
github · HIGH · Jul 17, 2026
Same issue here on macOS with the official Codex app. Selecting `gpt-5.3-codex-spark` causes the prompt to fail immediately with: ```text Unsupported parameter: 'reasoning.summary' is not supported with the 'gpt-5.3-codex-spark' model. ``` I am using the official app, not a custom API provider. Please ensure the app omits `reasoning.summary` when Spark is selected.View original ↗
github · HIGH · Jul 12, 2026
Same issue here: Unsupported parameter: 'reasoning.summary' is not supported with the 'gpt-5.3-codex-spark' model. I have this config: `model_reasoning_effort = "medium" [agents] max_threads = 4 max_depth = 1 `View original ↗
github · HIGH · Jul 10, 2026
### 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 informa…View original ↗