gpt 5.3 codex from OpenAI provider does not show its thinking #12523

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1. lopi-py

   added

   bugSomething isn't workingSomething isn't working

   on Feb 6, 2026
2. github-actions

   assigned

   rekram1-node

   on Feb 6, 2026
3. github-actions

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   windows

   on Feb 6, 2026
4. github-actions commented on Feb 6, 2026

   

   github-actionsBot

   on Feb 6, 2026 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • xhigh reasoning variant unavailable for GPT-5.3 Codex #12355: xhigh reasoning variant unavailable for GPT-5.3 Codex - also reports GPT-5.3 issues with reasoning/thinking variants
   • GPT 5.2 thinking blocks missing #11273: GPT 5.2 thinking blocks missing - reports missing thinking blocks from OpenAI models on Windows

   Feel free to ignore if none of these address your specific case.
5. NamedIdentity commented on Feb 17, 2026

   

   NamedIdentity

   on Feb 17, 2026

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   Can confirm this issue.

   I was hunting down the thinking blocks missing issue I reported a few weeks ago for ChatGPT via Plus oauth (#11273). Resolved that, but found Codex 5.3 remaining output these thinking blocks that are overly concise to the point of not really be a block of thinking.
6. lopi-py commented on Feb 18, 2026

   

   lopi-py

   on Feb 18, 2026

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   I believe it will be fixed once gpt 5.3 codex is available via api

   👀React with 👀2Reacted by shekohex and Boris Berman
7. MattesMrzik commented on Mar 5, 2026

   

   MattesMrzik

   on Mar 5, 2026

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   For me also the Github Copilot provided GPT-5-mini does not show thinking.
8. diegonix commented on Mar 7, 2026

   

   diegonix

   on Mar 7, 2026

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   Confirming the issue on OpenCode 1.2.20 with GPT-5.3-Codex models (high/xhigh reasoning effort).

   Symptoms:

   • Only thinking block headers display ("Thinking: ...")
   • Content is truncated/hidden
   • Works fine with GPT-5.2
   • Configuration "include": ["reasoning.encrypted_content"] in opencode.json doesn't resolve it

   Environment:

   • OpenCode: 1.2.20
   • Model: openai/gpt-5.3-codex
   • OS: Linux (likely affects all platforms)

   This appears to be a rendering issue in the TUI rather than a response parsing problem, since the header is visible but the reasoning content isn't displayed.

   @rekram1-node - Would this be related to how streaming responses are buffered/rendered for 5.3's reasoning format vs 5.2? Happy to provide logs or help with debugging if needed.

   Thanks for looking into this.
9. josevelaz commented on Mar 14, 2026

   

   josevelaz

   on Mar 14, 2026

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   I believe im also seeing the same issue with 5.4
10. iTzFaisal commented on Apr 11, 2026

    

    iTzFaisal

    on Apr 11, 2026

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    I'm seeing the same in GPT-5.3-Codex from GitHub Copilot in OpenCode. I can't see the thinking text at all !

    I tried GPT-5.4 mini from GitHub Copilot in OpenCode and I can see the thinking text.

    I've enabled /thinking or both.

    👍React with 👍1Reacted by Matthias Preu
11. thdxr

    removed

    bugSomething isn't workingSomething isn't working

    windows

    on May 3, 2026
12. github-actions commented on Jul 3, 2026

    

    github-actionsBot

    on Jul 3, 2026 – with GitHub Actions

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    To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.
13. github-actions

    closed this as not plannedon Jul 3, 2026
14. katsar0v commented on Aug 5, 2026

    

    katsar0v

    on Aug 5, 2026

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    I have the same problem
15. lopi-py commented on Aug 6, 2026

    

    lopi-py

    on Aug 6, 2026

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    @katsar0v it's openai not revealing the thinking summary, likely to avoid distillation attacks