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Simon Willison Blog·Frameworks·2d ago·~1 min read

llm 0.32a2

12th May 2026

A bunch of useful stuff in this LLM alpha, but the most important detail is this one:

Most reasoning-capable OpenAI models now use the

/v1/responses

endpoint instead of/v1/chat/completions

. This enables interleaved reasoning across tool calls for GPT-5 class models. #1435

This means you can now see the summarized reasoning tokens when you run prompts against an OpenAI model, displayed in a different color to standard error. Use the -R

or --hide-reasoning

flags if you don't want to see that.

Recent articles

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- Vibe coding and agentic engineering are getting closer than I'd like - 6th May 2026

#fine-tuning#observability
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