FLUX.3 Klein looks like a sidegrade: comparison reveals AI-slop training data contamination
ZootAllures9111 · reddit · 2026-10-17
The author posts a 6-way comparison of FLUX.2 Klein (4B/9B) vs FLUX.3 Klein (5.6B) with identical prompts: F3K's anatomy issues aren't as bad as claimed, but it's at best a sidegrade from even F2K 4B. Both F3K versions show telltale signs of training on poorly curated Nano Banana/ChatGPT-generated images (melty background details, strange eyes) that F2K never had — and FLUX.3 didn't even get a new/better VAE, which likely compounds the problem.
Related event: FLUX 3 and Qwen Image 2.1 Fall Short in User Tests(3 posts)→
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