Final Workflow · Flux 2 Klein 9B

ArchViz Flux 2 Klein 9B 2× Upscale + Optional Caption

Sister workflow to the Z-Image Turbo upscaler — same Ultimate SD Upscale tiling pattern, but the diffusion backbone is flux-2-klein-9b-fp8 paired with qwen_3_8b_fp8mixed as the text encoder, flux2-vae as the VAE, and 4x-UltraSharp as the pre-upscaler. Optional Florence caption pass preserves materials when you want it; leave the prompt empty to skip.

Animated Node Graph

Top-level workflow and the exploded Flux Klein Brain subgraph.

Drag node headers to rearrange, pinch or Ctrl/⌘‑scroll to zoom, drag the canvas to pan. The optional Florence path on the top-level graph feeds a captioned prompt into the subgraph that runs the Flux 2 Klein 9B sampler.

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Load ImageIMAGEMASKimagesource_render.pngsize1280 × 720
Source render entering the workflow.
Florence2 Load (optional)FLORENCE2modelFlorence-2-large-PromptGen-v2.0precisionfp16
Optional caption generator — skip if you supply your own prompt.
Florence2 Run (optional)imageflorence2captiontaskdetailed_captionmax_new_tokens512
Generates a descriptive caption from the input image.
Text Concatenatestring_astring_bSTRINGstring_bpreserve materials…delimiter,
Appends a fixed material-preservation prompt.
Flux Klein Brain (subgraph)imagetextIMAGEupscale_by2.00steps10cfg1.0denoise0.15Diffusion Modelflux-2-klein-9b-fp8Text Encoderqwen_3_8b_fp8mixedVAEflux2-vaeUpscale Model4x-UltraSharp.pth
ArchViz Flux 2 Klein 9B 2× Upscale + Optional Caption.
Image Compare (BETA)image_aimage_b
Side-by-side preview: before vs. after.
Save Imageimagesfilename_prefixArchViz_FluxKlein2xoutput2560 × 1440
Writes the final upscaled PNG to /output.
Drag a node's header to reposition · Drag the canvas to pan · Pinch or Ctrl/⌘‑scroll to zoom · Reset restores the layout.

Models · Download checklist

What this workflow expects on disk.

Diffusion Model
flux-2-klein-9b-fp8.safetensors
models/diffusion_models/
~9.2 GB Download
Text Encoder
qwen_3_8b_fp8mixed.safetensors
models/text_encoders/
~8.9 GB Download
VAE
flux2-vae.safetensors
models/vae/
~335 MB Download
Upscale Model
4x-UltraSharp.pth
models/upscale_models/
Caption LLM (optional)
Florence-2-large-PromptGen-v2.0
models/LLM/Florence-2-large-PromptGen-v2.0/
~1.6 GB Download

Grab the JSON. Download the Flux 2 Klein workflow file and drop it into ComfyUI. Other workflows are shared in the same Drive folder.