January 2026

Simon Willison's Weblog

FLUX.2-klein-4B Pure C Implementation

Black Forest Labs released FLUX.2-klein-4B, an Apache 2.0 licensed 4B parameter text-to-image model. Salvatore Sanfilippo created a pure C implementation that runs without dependencies, demonstrating...

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Universe of AI

Claude Cowork: The AI Agent for Everyday Work! Plus LEAKED Features

Anthropic is fundamentally shifting Claude from a chat-first product to a productivity-focused system through Claude Cowork, which gives the AI direct file access and autonomous task execution...

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Simon Willison's Weblog

Quoting Jeremy Daer

Jeremy Daer from 37signals explains why AI agents should use CLI tools instead of REST APIs. CLI interfaces enable cheaper, faster models to handle complex tasks that would otherwise require...

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Universe of AI

AI News: AI Girls Are Fooling Everyone… And Ads Just Hit ChatGPT!

This video covers recent AI developments including sophisticated AI-generated content that's fooling even AI experts, and major ChatGPT updates. The line between real and synthetic content has...

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Simon Willison's Weblog

Our approach to advertising and expanding access to ChatGPT

OpenAI announced plans to introduce advertising to ChatGPT's free and new Go tiers in the coming weeks, while launching a new $8/month Go tier today. The company promises ads won't influence...

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