Flux 2 Klein runs fully in-browser via WebGPU: 0.6B encoder swap plus int8/int4 quantization
radamar · x · 2026-09-10
Developer radamar demonstrates running the image model Flux 2 Klein entirely in the browser with WebGPU, assisted by Fable/Astra. It's slow but functional, with a live demo and an npm package (flux-klein.js).
Key optimization pointers:
- Replace the Qwen3 4B text encoder with the 0.6B variant
- Use BFL's small VAE decoder
- Quantize the transformer to int8 on desktop and int4 on mobile
- Stream weights on mobile, since the full model doesn't fit in phone memory
Related event: Flux 2 Klein Runs Entirely in the Browser via WebGPU(2 posts)→
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