Simon Willison: LLM 0.32a2 Ships with OpenAI Responses API — Enables Interleaved Reasoning Across Tool Calls for GPT-5 Class Models
Simon Willison's Blog·medium signal
Simon Willison's LLM CLI tool alpha switches most reasoning-capable OpenAI models to the /v1/responses endpoint instead of /v1/chat/completions, enabling interleaved reasoning across tool calls for GPT-5 class models. This is a significant architectural shift in how LLM tools interact with frontier models — reasoning no longer pauses between tool invocations.