GPT-5.5 prompting guide

OpenAI has released a comprehensive guide on utilizing the new GPT-5.5 model available via API. The guide includes tips for improving prompting, such as sending brief user-visible updates before executing multi-step tasks. This approach makes longer tasks feel smoother and reduces the perception of model crashes. OpenAI emphasizes treating GPT-5.5 as a new model family requiring specific tuning, rather than a drop-in replacement for previous versions like GPT-5.2 or GPT-5.4. Starting with a fresh baseline and not relying on old instructions is crucial for effective adaptation.