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Black Forest LabsImage

FLUX 3 Klein

The small, fast FLUX 3 for drafts under a cent.

image/flux-3-klein
Try it in StudioUse with your agent or API
Made with FLUX 3 Klein: Quick concept sketch for a cozy village level in a top-down game: cottages, a well, a winding path, soft pastel colors,

Quick concept sketch for a cozy village level in a top-down game: cottages, a well, a winding path, soft pastel colors, no text.

Price
0.9 credits / image
Typical time
about 2 s
Makes
Text to image, Image editing

Best for

FLUX 3 Klein is the small, fast FLUX 3. It makes a 1K image in seconds for under a cent, and it edits from references too, so it suits rounds of quick ideas.

  • Many quick variations of an icon or item.
  • Fast mood boards before choosing a style.
  • Cheap reference images for 3D generation.

Put it together

Where FLUX 3 Klein fits in a game, with the models it works well with. Your agent runs every step.

Price

ModeModelPrice
Text to image, Image editingFLUX 3 Klein0.9 credits / image

Paid from your Summer credits.

Use it from code or your agent

Sign in once with summer login. Your agent or your code then runs it with your paid credits.

npx -y summer-engine@latest login
npx -y summer-engine@latest api run image/flux-3-klein \
  --input '{"prompt":"a cozy pixel-art tavern at night","aspectRatio":"16:9"}' \
  --download .

image/flux-3-klein: $0.009 per image. Paid from your Summer credits.

Inputs

What input takes for image/flux-3-klein. Send only what you need; Summer fills in tested defaults.

  • promptstringRequired · up to 4000 characters

    What to draw, or how to change the reference image.

  • styleenum
    • realistic
    • cartoon
    • anime
    • none
  • aspectRatioenum

    Default 1:1.

    • 1:1
    • 16:9
    • 9:16
    • 4:3
    • 3:4
    • 3:2
    • 2:3
    • 5:4
    • 4:5
    • 21:9
  • widthinteger64 to 4096

    Smallest width wanted, in pixels; give height too. Store key art: 1920 x 1080 at 16:9.

  • heightinteger64 to 4096

    Smallest height wanted, in pixels; give width too.

  • numImagesintegerDefault 1 · 1 to 4
  • referenceImageUrlstringup to 2048 characters

    A public image URL to edit instead of drawing from nothing.

  • removeBackgroundboolean

    Also cut out the background (transparent PNG); costs a removal per image.

  • seedintegerat least 0

    Same seed and prompt, similar image (Nano Banana models).

  • titlestringup to 200 characters

Model docs · Summer API docs · Set up the Summer MCP server · Try it in the browser

Questions

What is FLUX 3 Klein good for in game development?
FLUX 3 Klein is the small, fast FLUX 3. It makes a 1K image in seconds for under a cent, and it edits from references too, so it suits rounds of quick ideas. Typical game uses: many quick variations of an icon or item; fast mood boards before choosing a style; cheap reference images for 3D generation.
How much does FLUX 3 Klein cost in Summer?
FLUX 3 Klein costs 0.9 credits / image in Summer Studio. It is charged from your Summer credits.
Can FLUX 3 Klein edit an existing image?
FLUX 3 Klein supports text to image and image editing in Summer. It can also edit an existing image using up to 10 reference images.
Can I use FLUX 3 Klein from Claude Code, Cursor or Codex?
Yes. Connect the Summer MCP server to Claude Code, Cursor, Codex or another MCP client, then ask your agent to generate with summer_generate_image with model: "flux-3-klein". Setup instructions are at summerengine.com/mcp.
Where do FLUX 3 Klein results go?
Every generation is saved to your Summer asset library. From there you can download it or bring it into a Summer Engine project.