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Codex mobile expands reasoning traces by default; should match desktop collapsed behavior #23250
Description
Codex desktop keeps reasoning/thinking sections collapsed by default, with click-to-expand. That behavior is good.
On Codex mobile in the ChatGPT app, the full reasoning trace is expanded by default. For long high/xhigh Codex sessions, this makes the thread extremely hard to read and slows down review work.
Expected behavior:
- Keep reasoning collapsed by default on mobile, same as desktop.
- Allow tap-to-expand when I want to inspect it.
- Do not reduce reasoning effort or remove the trace; this is only a presentation issue.
This is especially important for users running high/xhigh reasoning, where the reasoning block can dominate the entire mobile screen.
Activity
ropepop commentedon Aug 10, 2026
Supporting consistency with desktop here, from the third-party-model side: with a custom provider, desktop renders the reasoning summary collapsed with tap-to-expand, plus the tool-call middle section. On mobile remote the same thread either expands the trace flatly or loses the middle section depending on where the thread was created (see #31370 for the mobile-created-thread divergence). A collapsed-by-default, tap-to-expand presentation matching desktop would be the right fix — and it should apply consistently to custom-provider threads too, not just native OpenAI ones.