GPT 5.5 just leaked its chain of thought to me in codex, and it looks like an idea from 5 months ago in this sub.

Reddit r/LocalLLaMA / 5/3/2026

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A Reddit user reports that GPT 5.5-medium accessed via Codex produced output that appears to include “chain-of-thought” style reasoning during a coding task.
The leaked reasoning was written as step-by-step instructions focused on using absolute paths, handling Windows paths, formatting final output in specific ways, and avoiding incorrect paths.
The user describes the output as resembling an idea posted about five months earlier in a related subreddit discussion.
The report is presented as a firsthand incident from the middle of the user’s project, without official confirmation from the model provider.
Overall, the post raises concerns about whether certain prompting or tooling setups can expose internal reasoning traces or overly verbose intermediate logic.

https://www.reddit.com/r/LocalLLaMA/comments/1p0lnlo/make_your_ai_talk_like_a_caveman_and_decrease/

In the middle of a project I'm working on, I got this output from GPT 5.5-medium via codex:

Implemented the narrower fix in Homm3ImportUnitPreviewModelHook.cs? Need absolute path. Need know cwd absolute. v:... Use markdown. final with path. Need avoid bogus path. Use Homm3ImportUnitPreviewModelHook.cs? Format requires /abs/path. Windows abs maybe v:.... Use angle. Final no too long. Need include uncommitted. Proceed.

submitted by /u/Homeschooled316
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GPT 5.5 just leaked its chain of thought to me in codex, and it looks like an idea from 5 months ago in this sub.

Key Points

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