Codex has recently started ignoring instructions and making unsafe patches

Small update: I switched to GPT-5.5 in Codex and, so far, its behavior is back to normal. With the same project and the same workflow, GPT-5.5 follows instructions much better than GPT-5.4 did during the last few days. I am now using Codex with a very strict workflow: backup → one change → list files → approval → patch This seems to work well again with GPT-5.5. Of course I cannot know what exactly happened with GPT-5.4. It may have been a regression, a routing issue, or some change in model behavior. However, from a user’s point of view, the experience is quite clear: GPT-5.4 suddenly became much harder to control, while GPT-5.5 works properly again. This inevitably creates the impression that users are being pushed, indirectly, toward the newer and more expensive model. I am not stating this as a fact, only as an observation from real usage. Στις Σάβ 6 Ιουν 2026 στις 1:16 π.μ., ο/η Paul έγραψε: