OpenAI has released a prompting guide for GPT-5.5 with practical recommendations including sending user-visible updates during multi-step tasks and treating it as a new model family rather than a drop-in replacement. The guide suggests starting migration with fresh baselines and provides tools like an automated upgrade command via openai-docs. This represents a significant shift in prompting strategy compared to previous GPT-5.x models.
Background
GPT-5.5 is OpenAI's latest language model release, requiring different prompting approaches than previous versions. Prompt engineering has become increasingly important as LLMs grow more sophisticated and specialized.
- Source
- Simon Willison
- Published
- Apr 25, 2026 at 12:13 PM
- Score
- 6.0 / 10