Flux 2 Klein
- 354k installs
- 31 repo stars
- Updated May 15, 2026
- agentspace-so/runcomfy-agent-skills
Flux 2 Klein is a Claude skill that generates images with Black Forest Labs' distilled Flux 2 Klein model through the local RunComfy CLI.
About
Generates images with Black Forest Labs' Flux 2 Klein, the distilled low-latency variant of Flux 2, through the local RunComfy CLI. A developer uses the 4B variant for sub-second concepting and live art-direction, then switches to the 9B variant for a polished final pass with the same prompt grammar. It documents the step-count strategy and routes to Flux 2 Pro or Seedream 5 when maximum resolution or detail is needed.
- Text-to-image with Black Forest Labs Flux 2 Klein (4B fast / 9B polish) via the RunComfy CLI
- Sub-second 4-step iteration for live art-direction sessions
- Up to 4 reference images for multi-reference brand styling
Flux 2 Klein by the numbers
- 354,342 all-time installs (skills.sh)
- Security screen: MEDIUM risk (skills.sh audit)
- Data as of Jul 28, 2026 (Skillselion catalog sync)
flux-2-klein capabilities & compatibility
Skill is MIT-licensed; needs a RunComfy account and GPU generation is billed by RunComfy.
- Capabilities
- image generation · text to image · brand styling
- Use cases
- image generation
- Runs
- Local or remote
- Pricing
- Bring your own API key
What flux-2-klein says it does
the distilled, low-latency variant of Flux 2
Sub-second 4-step inference. Use for live iteration / concepting.
Resolution ceiling ~2K
npx skills add https://github.com/agentspace-so/runcomfy-agent-skills --skill flux-2-kleinAdd your badge
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| Installs | 354k |
|---|---|
| repo stars | ★ 31 |
| Security audit | 2 / 3 scanners passed |
| Last updated | May 15, 2026 |
| Repository | agentspace-so/runcomfy-agent-skills ↗ |
How do you generate Flux 2 Klein images on RunComfy?
Generate images fast from a text prompt for live art-direction and rapid concepting, then polish on the 9B variant.
Who is it for?
Latency-first creative iteration and multi-reference brand styling
Skip if: 2K-4K hero images or embedded-text/logo rendering (route to Seedream 5 or GPT Image 2)
When should I use this skill?
User says 'flux 2 klein', 'flux klein', or asks to generate with this model
What you get
Generated Flux 2 Klein image, step-count and 9B or 4B variant settings, and runcomfy CLI command.
- generated image file downloaded to output-dir
By the numbers
- two variants 4B and 9B
- steps 4-8 for concepting, ~25 for polish
- resolution ceiling ~2K, aspect cap 16:9
Files
Flux 2 Klein — Pro Pack on RunComfy
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 -gWhen to pick this model (vs siblings)
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.
Prerequisites
1. RunComfy CLI — npm i -g @runcomfy/cli 2. RunComfy account — runcomfy login opens a browser device-code flow. 3. CI / containers — set RUNCOMFY_TOKEN=<token> instead of runcomfy login.
Endpoints + input schema
Two variants, same endpoint shape, same prompt grammar.
blackforestlabs/flux-2-klein/9b/text-to-image
The fidelity-first variant. Use for polish / final output.
| Field | Type | Required | Default | Notes |
|---|---|---|---|---|
prompt | string | yes | — | Up to ~512 tokens. Longer degrades. |
steps | int | no | 25 | 4–50. Step-distilled architecture — 4–8 enough for concepting; ~25 for polish; >25 buys little. |
width | int | no | 1024 | 512–1536 typical. Aspect ratio capped at 16:9, max ~2K total. |
height | int | no | 1024 | Match width's aspect intent. |
blackforestlabs/flux-2-klein/4b/text-to-image
The latency-first variant. Sub-second 4-step inference. Use for live iteration / concepting.
Same field set as 9B. Default steps is effectively 4 — the variant is built for that step count.
Reference images (both variants)
Up to 4 simultaneous reference images are supported on the same endpoint for style transfer / guided composition. The exact field name in the JSON body is documented on the
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Pick flux-2-klein for sub-second iteration and brand reference styling; pick Flux 2 Pro or Seedream skills when final polish outweighs speed.
FAQ
What step counts does flux-2-klein recommend?
flux-2-klein documents 4–8 steps for fast Flux 2 Klein iteration and roughly 25 steps for polish on runcomfy run blackforestlabs/flux-2-klein/9b/text-to-image. The 9B versus 4B variant trade-off is included.
Which Flux 2 Klein variants does flux-2-klein support?
flux-2-klein calls blackforestlabs/flux-2-klein/9b/text-to-image or the 4B variant through RunComfy CLI. The skill explains sub-second latency strengths and when to route to Flux 2 Pro or Seedream 5.
Is Flux 2 Klein safe to install?
skills.sh reports 2 of 3 security scanners passed. Review the Security Audits panel on this page before installing in production.