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Simon Willison Emerging AI Innovations Apr 25

GPT-5.5 prompting guide

★★★★★ significance 3/5

OpenAI has released a new prompting guide for the GPT-5.5 model available via API. The guide includes tips for managing multi-step tasks and instructions for migrating existing code using specialized skills.

Why it matters Optimizing for new architectural shifts is becoming a prerequisite for maintaining reliability in complex, multi-step agentic workflows.
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Entities mentioned

OpenAI

Tags

#openai #gpt-5.5 #prompt engineering #api #coding

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