Simon Willison’s Weblog

13th September 2023

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TIL Using llama-cpp-python grammars to generate JSON — [llama.cpp](https://github.com/ggerganov/llama.cpp) recently added the ability to control the output of any model using a grammar.

Posted 13th September 2023 at 3:36 am

Recent articles

One-shotting a Raccoon Heist game using Claude Fable 5 - 5th August 2026
New release of LLM adds support for reasoning traces, OpenAI Responses, server-side tools, and smarter logging - 4th August 2026
Stateless MCP has recaptured my interest (and inspired mcp-explorer and datasette-mcp) - 31st July 2026

This is a beat by Simon Willison, posted on 13th September 2023.

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