Flux 3 Klein's Default Templates Are Broken Without Its Prompt Upscaler
StrictMove5839 · reddit · 2026-10-16
A Reddit user flags that Black Forest Labs' Flux 3 Image Klein relies on a prompt upscaler — a Qwen3.5-9B fine-tune that converts natural language into the model's expected prompt style — but the default ComfyUI/Diffusers templates omit it, wrecking output quality. BFL has already noticed and filed a PR recommending the upsampler for all use cases. Workaround: wire in the publicly released upscaler now, and use CFG 1 for distilled or 3.5 for base.
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