ComfyUI adds system prompt support: run Qwen-Image 2.1 prompt rewriting for ~500 tokens
fallengt · reddit · 2026-09-23
ComfyUI just merged PR #16442 adding system prompt support for text generation. The author shares a full setup for Qwen-Image 2.1 prompt rewriting: download the qwen3.59b t2i/edit weights (they're not text encoders), load CLIP with type qwenimage, and paste Qwen's official 2.1 system prompts. Recommended settings: t2i (Temp 1.0, TopP 0.95, TopK 20, Maxlength 16,256, Presence Penalty 1.5) and edit (Maxlength 24,000, Penalty 0.0), with thinking and default template on. Token-saving tip: append an "Immediate Final Output" instruction forcing direct JSON output and disable thinking—this skips reasoning and produces a decent rewritten prompt in 500 tokens instead of 5,000-6,000.
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