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After GPT-4o launched, the same prompts started failing — the model rewrites logic, strips formatting, omits output, or reorders blocks even when explicitly told not to
chapman4444 on Hacker News
In the thread “GPT-4o breaks code structure under strict prompts (compared to GPT-4-turbo)”
Helped: GPT-4-turbo obeyed strict prompts consistently.
Got in the way: GPT-4o rewrites logic and strips formatting despite instructions.
I’ve used GPT-4-turbo for months with production-grade scripting tasks where prompts like “fix only,” “don’t reformat,” or “return the full script” were obeyed consistently. After GPT-4o launched, the same prompts started failing — the model rewrites logic, strips formatting, omits output, or reorders blocks even when explicitly told not to. This GitHub repo documents specific examples with prompt/output comparisons: https://github.com/chapman4444/gpt4o-regression-report …