Recent Regression: 5.4 Thinking Model reopens already-proved points without identifying a concrete gap

Thanks… GPT-5.4 Thinking is the one. Honestly, after running more tests I came away thinking the pattern looked more structural than like a tuning regression so rather than keep grinding on repros, I’ve moved the relevant work elsewhere. I’ll leave the post up in case other users are seeing the same thing, but I don’t have more repro data to share.