Simon Willison 11/14/2025

Introducing GPT-5.1 for developers

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OpenAI has introduced GPT-5.1 for developers via its API, featuring four new models. Key updates include a new default 'none' reasoning effort for latency-sensitive tasks, adaptive reasoning that adjusts thinking based on task difficulty, and extended 24-hour prompt cache retention. The release also introduces new built-in tools like 'apply_patch' for file editing, with no associated price increase for the new caching feature.

Introducing GPT-5.1 for developers

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