Black Forest Labs · fal.ai · Fast text to image
FLUX.2 [flash]
FLUX.2 [flash] (Black Forest Labs), fast text to image, served by fal.ai. The OpenAPI schema for the fal-ai/flux-2/flash queue. Price: $0.005 per megapixel pro rata; preset sizes are at most 1.05 megapixel, billed $0.0053 per image; explicit sizes (512 to 2048 per side) billed on their exact pixel count, e.g. 1536x1024 $0.007864, 2048x2048 $0.020972.
From $0.0053 / unitfal.aiImagefal/flux-2-flashListed
Activation pending; your agent will see it as unavailable until then.
Use this tool with your agent
Use my connected Agentik MCP server. I want to use the tool fal/flux-2-flash (FLUX.2 [flash] (Black Forest Labs), fast text to image). Call inspect_tool with {"tool_id": "fal/flux-2-flash"} first and tell me the price before anything runs. Ask me for the inputs it needs; never invent values, IDs or file URLs. When I confirm, call run_tool with tool_id "fal/flux-2-flash" and my inputs, follow it with get_run if it is still running, and give me the result and the price Agentik reports. If the tool is unavailable, say so and use discover_tools to propose an alternative.Show the prompt
Paste it into Claude, ChatGPT or Codex: your agent takes it from there, and shows the price before it runs.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
image_size | string | No | The size of the image to generate. The width and height must be between 512 and 2048 pixels. Options: square_hd, square, portrait_4_3, portrait_16_9, landscape_4_3, landscape_16_9, 1536x1024, 1024x1536, 1536x1536, 1920x1440, 1440x1920, 2048x1152. |
prompt | string | Yes | The prompt to generate an image from. |
output_format | string | No | The format of the generated image. Options: jpeg, png, webp. |
enable_prompt_expansion | boolean | No | If set to true, the prompt will be expanded for better results. |
seed | integer | No | The seed to use for the generation. If not provided, a random seed will be used. |
guidance_scale | number | No | Guidance Scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you. |
num_images | integer | No | The number of images to generate. |
enable_safety_checker | boolean | No | If set to true, the safety checker will be enabled. Disabling it requires account authorization; unauthorized requests are always checked, and images flagged as unsafe are returned as black images. |
How your agent calls it
First inspect_tool for the current schema and price, then run_tool with the published example after confirming your inputs:
{
"tool_id": "fal/flux-2-flash",
"input": {
"prompt": "a small red cube on a white table",
"num_images": 1,
"image_size": "square"
}
}Price and billing
- Price
- From $0.0053 / unit
- Model
- Per unit
- Detail
- The provider’s price, with no markup. Billed for measured usage.
- The provider’s price, 0% markup.
- One prepaid balance for every provider; your agent sees the price before it runs.
- Pay for measured usage; unused reservations are released.