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Generate images with Flux 2 Klein (Black Forest Labs' distilled fast variant of Flux 2) on RunComfy — bundled with the model's documented prompting patterns so the skill gets sharper output than naive prompting against the same model. Documents Flux 2 Klein's strengths (sub-second latency, multi-reference brand styling, declarative subject-first prompts), the step-count strategy (4–8 for fast iteration, ~25 for polish), the 9B vs 4B variant trade-off, and when to route to Flux 2 Pro / Seedream 5
Passed 23 of 23 test cases with the skill, and 9 of 23 without it.
and 14 more in the full report
14 fixed9 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.
What is the maximum supported aspect ratio limit when configuring custom width and height parameters for Klein image generation?
| Checked | Without skill | With skill |
|---|---|---|
| The response states an aspect ratio limit of 16:9 | Missed | Passed |
The instructions your model reads when the skill loads.
runcomfy.com · 9B model · 4B model · GitHub
Black Forest Labs' Flux 2 Klein (the distilled, low-latency variant of Flux 2) hosted on the RunComfy Model API — no API key, async REST.
npx skills add agentspace-so/runcomfy-skills --skill flux-2-klein -g
Flux 2 Klein's distinct strength is latency-first creative iteration: sub-second feedback enables live art-direction sessions and rapid product visualization that batch-style models can't sustain. Pick it when iteration speed matters more than ceiling resolution.
| You want | Use |
|---|---|
| Real-time / live art-direction sessions | Flux 2 Klein 4B |
| Fast iteration with strong detail at the end | Flux 2 Klein 9B |
| Multi-reference brand styling with consistent looks | Flux 2 Klein |
| 2K–4K hero images, max resolution | Seedream 5 |
| Maximum prompt adherence + extreme detail | Flux 2 Pro |
| Embedded text, logos, multilingual signage | GPT Image 2 |
| Hyperrealistic portrait | Nano Banana Pro |
If the user said "Flux 2 Klein" / "BFL Klein" / "flux klein" explicitly, route here regardless. If they said "Flux 2" generically, ask whether they want Klein (fast) or Pro (max quality) before defaulting.
npm i -g @runcomfy/cliruncomfy login opens a browser device-code flow.RUNCOMFY_TOKEN=<token> instead of runcomfy login.Two variants, same endpoint shape, same prompt grammar.
blackforestlabs/flux-2-klein/9b/text-to-imageThe fidelity-first variant. Use for polish / final output.
test cases passed, vs 9 / 23 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.