GPT-5.5 Behavior Feedback: Lower Hallucinations, but Reduced Reasoning Depth and Usability

Thanks for taking the time to put this together. I appreciate the level of detail you've provided, especially around the trade-offs you've observed between reasoning depth, instruction-following, and safety. Feedback like this is incredibly helpful because it explains not just what you're seeing, but how it affects real-world workflows. I'll make sure this feedback is passed along to the team. Thanks again for sharing your experience.