Simon Willison • 1/19/2026

FLUX.2-klein-4B Pure C Implementation

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The article details Salvatore Sanfilippo's (antirez) project to create a pure C implementation of the FLUX.2-klein-4B model, a 4B parameter AI model released by Black Forest Labs. It highlights the use of Claude Code and Claude Opus 4.5 as AI assistants in the development process and discusses the methodology for managing the complex coding task.

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#c #stable diffusion #Implementation
FLUX.2-klein-4B Pure C Implementation

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