Flux 2 Max: Photorealistic 4MP Text-to-Image Generation with Style Control on playground and API | RunComfy
FLUX.2 [max] generates photorealistic, brand-consistent images from text or references with up to 4MP clarity, precise color and typography control, and efficient web or API-based production.
Table of contents
1. Get started
Use RunComfy's API to run blackforestlabs/flux-2/max/text-to-image. For accepted inputs and outputs, see the model's schema.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/blackforestlabs/flux-2/max/text-to-image \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "A majestic snow-covered mountain at sunrise, resembling Mount Hood, towering in the center of the composition with dramatic lighting highlighting the upper ridges in warm orange and pink hues. The peak is partially draped in wisps of low-hanging clouds and mist, creating a dreamy atmosphere. Dense evergreen forest forms a dark silhouette in the foreground, while the mid-ground slopes are detailed with snow trails and natural rock striations. The sky is filled with a mix of deep indigo, mauve, and golden-orange clouds, with light breaking through from the left side, illuminating the scene with a soft, cinematic glow. Photorealistic, high detail, 8k resolution, golden hour lighting, ultra-realistic rendering, Unreal Engine style landscape scene, hyper-detailed textures, moody and atmospheric."
}'2. Authentication
Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.
3. API reference
Submit a request
Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/blackforestlabs/flux-2/max/text-to-image \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "A majestic snow-covered mountain at sunrise, resembling Mount Hood, towering in the center of the composition with dramatic lighting highlighting the upper ridges in warm orange and pink hues. The peak is partially draped in wisps of low-hanging clouds and mist, creating a dreamy atmosphere. Dense evergreen forest forms a dark silhouette in the foreground, while the mid-ground slopes are detailed with snow trails and natural rock striations. The sky is filled with a mix of deep indigo, mauve, and golden-orange clouds, with light breaking through from the left side, illuminating the scene with a soft, cinematic glow. Photorealistic, high detail, 8k resolution, golden hour lighting, ultra-realistic rendering, Unreal Engine style landscape scene, hyper-detailed textures, moody and atmospheric."
}'Monitor request status
Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
--header "Authorization: Bearer <token>"Retrieve request results
Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
--header "Authorization: Bearer <token>"Cancel a request
Cancel a queued job by request_id, in-progress jobs cannot be cancelled.
curl --request POST \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
--header "Authorization: Bearer <token>"4. File inputs
Hosted file (URL)
Provide a publicly reachable HTTPS URL. Ensure the host allows server‑side fetches (no login/cookies required) and isn't rate‑limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre‑signed URLs for private assets.
5. Schema
Input schema
{
"type": "object",
"title": "Input",
"required": [
"prompt"
],
"properties": {
"prompt": {
"title": "Prompt",
"description": "",
"type": "string",
"default": "A majestic snow-covered mountain at sunrise, resembling Mount Hood, towering in the center of the composition with dramatic lighting highlighting the upper ridges in warm orange and pink hues. The peak is partially draped in wisps of low-hanging clouds and mist, creating a dreamy atmosphere. Dense evergreen forest forms a dark silhouette in the foreground, while the mid-ground slopes are detailed with snow trails and natural rock striations. The sky is filled with a mix of deep indigo, mauve, and golden-orange clouds, with light breaking through from the left side, illuminating the scene with a soft, cinematic glow. Photorealistic, high detail, 8k resolution, golden hour lighting, ultra-realistic rendering, Unreal Engine style landscape scene, hyper-detailed textures, moody and atmospheric."
},
"image_size": {
"title": "Image Size",
"description": "Choose a predefined size.",
"type": "string",
"enum": [
"square_hd",
"square",
"portrait_4_3",
"portrait_16_9",
"landscape_4_3",
"landscape_16_9"
],
"default": "landscape_4_3"
},
"seed": {
"title": "Seed",
"description": "",
"type": "integer",
"default": 0
},
"output_format": {
"title": "Output Format",
"description": "The format of the generated image.",
"type": "string",
"enum": [
"jpeg",
"png"
],
"default": "jpeg"
}
}
}Output schema
{
"output": {
"type": "object",
"properties": {
"image": {
"type": "string",
"format": "uri",
"description": "single image URL"
},
"video": {
"type": "string",
"format": "uri",
"description": "single video URL"
},
"images": {
"type": "array",
"description": "multiple image URLs",
"items": { "type": "string", "format": "uri" }
},
"videos": {
"type": "array",
"description": "multiple video URLs",
"items": { "type": "string", "format": "uri" }
}
}
}
}RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Playground, enabling artists to harness the latest AI tools to create incredible art.