Model API

FLUX.2 [klein] 4B Base

Text-to-image generation with FLUX.2 [klein] 4B Base from Black Forest Labs. Enhanced realism, crisper text generation, and native editing capabilities.

Model id

Use this in every request

flux-2/klein/4b/base

This model has other modes with their own ids: flux-2/klein/4b/base/edit.

Run it

Quote the input, start the generation with the quote, then poll the job. Set RAYWAKE_API_KEY first; see Authentication.

# 1. Price the exact input (quotes are valid for up to 10 minutes)
curl -s https://api.raywake.com/v1/quotes \
  -H "Authorization: Bearer $RAYWAKE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "flux-2/klein/4b/base",
  "input": {
    "prompt": "A red ceramic cup on a wooden table, soft morning light"
  }
}'

# 2. Start the generation with the quote_id from step 1
curl -s https://api.raywake.com/v1/generate \
  -H "Authorization: Bearer $RAYWAKE_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{"model": "flux-2/klein/4b/base", "quote_id": "QUOTE_ID", "input": {"prompt":"A red ceramic cup on a wooden table, soft morning light"}}'

# 3. Poll until the status is terminal
curl -s https://api.raywake.com/v1/jobs/JOB_ID \
  -H "Authorization: Bearer $RAYWAKE_API_KEY"

Input

Input fields for flux-2/klein/4b/base
Name	Type	Description
`prompt`required	string	The prompt to generate an image from.
`negative_prompt`	string	Negative prompt for classifier-free guidance. Describes what to avoid in the image.
`guidance_scale`	number	Guidance scale for classifier-free guidance. Default: `5`
`seed`	integer	The seed to use for the generation. If not provided, a random seed will be used.
`num_inference_steps`	integer	The number of inference steps to perform. Default: `28`
`image_size`	string (enum)	The size of the image to generate. Default: `landscape_4_3` One of: `square_hd`, `square`, `portrait_4_3`, `portrait_16_9`, `landscape_4_3`, `landscape_16_9`
`num_images`	integer	The number of images to generate. Default: `1`
`acceleration`	string (enum)	The acceleration level to use for image generation. Default: `regular` One of: `none`, `regular`, `high`
`sync_mode`	boolean	If `True`, the media will be returned as a data URI. Output is not stored when this is True. Default: `false`
`output_format`	string (enum)	The format of the generated image. Default: `png` One of: `jpeg`, `png`, `webp`

Output

A succeeded job lists its results under outputs, stored on our side. See Jobs for every field.

Job excerpt

"outputs": [
  { "type": "image", "url": "https://…", "mime_type": "image/png", "thumbnail_url": "https://…" }
]

Pricing

1 megapixel$0.02/ megapixel

The exact charge for your input comes from a quote. How charges settle