Simon Willison’s Newsletter

Gemma 3n, Context Engineering and a whole lot of Claude Code

Phoenix.new is Fly's entry into the prompt-driven app development space

Trying out the new Gemini 2.5 model family

The lethal trifecta for AI agents

Comma v0.1 1T and 2T - 7B LLMs trained on openly licensed text

The last six months in LLMs, illustrated by pelicans on bicycles

How often do LLMs snitch? Recreating Theo's SnitchBench with LLM

Large Language Models can run tools in your terminal with LLM 0.26

Highlights from the Claude 4 system prompt

Building software on top of Large Language Models

Trying out llama.cpp's new vision support

Feed a video to a vision LLM as a sequence of JPEG frames on the CLI (also LLM 0.25)