Use H3 Max Turbo with Comfy Router

Call fal/h3-max-turbo through Comfy Router: endpoint, request shape and the response Router returns.

API Reference for fal/h3-max-turbo, served by Comfy Router from fal.

Quick start

Create a key in your Comfy workspace and export it as COMFY_API_KEY. The Python and TypeScript snippets use the Comfy SDKs (pip install comfy-sdk, npm install @comfyorg/sdk); the cURL snippet is the same call over raw HTTP.

Model ID: fal/h3-max-turbo

Endpoint: POST https://api.comfy.org/v2/models/fal/h3-max-turbo

Python

from comfy_sdk import Comfy

# Reads COMFY_API_KEY from the environment.
# The SDK automatically creates an idempotency key and reuses it for automatic retries.
with Comfy() as client:
    result = client.models.run(
        "fal/h3-max-turbo",
        {
            "duration": 5,
            "prompt": "a red fox running through a snowy forest",
            "prompt_expansion_mode": "balanced",
            "resolution": "480P",
        },
    )

print(result)

Schema

Input

aspect_ratio · string · default: "\"16:9\""

Aspect ratio: 21:9, 16:9, 4:3, 1:1, 3:4, or 9:16.

duration · integer · default: "5"

Duration of the generated video in seconds.

enable_safety_checker · boolean · default: "true"

Enable the safety checker.

prompt · string · required

Text prompt for video generation.

prompt_expansion_mode · string · required

How much effort to spend rewriting the prompt before generation: balanced or quality.

resolution · string · default: "\"768P\""

Resolution of the generated video: 480P or 768P.

seed · integer

Random seed. A random seed is selected when omitted.

sync_mode · boolean

Return the generated video as base64 instead of a CDN URL.

Generated from the schema Router serves at GET /v2/models/fal/h3-max-turbo/openapi.json, the same document it validates a call against before the request reaches the provider.

Output

expanded_prompt · string

The prompt after expansion, as sent to the model.

timings · object

End-to-end timing breakdown (seconds).

video · object · required

The generated video file.

video.content_type · string

MIME type of the video file.

video.file_name · string

Name of the video file.

video.file_size · integer

Size of the video file in bytes.

video.url · string

URL of the generated video.

Examples

Input

{
  "duration": 5,
  "prompt": "a red fox running through a snowy forest",
  "prompt_expansion_mode": "balanced",
  "resolution": "480P"
}

Output

{
  "expanded_prompt": "a single red maple leaf falling onto still water, cinematic, 4k",
  "timings": {
    "inference": 42.5
  },
  "video": {
    "content_type": "video/mp4",
    "file_name": "output.mp4",
    "file_size": 4194304,
    "url": "https://example.invalid/fal/minimax/h3-max/output.mp4"
  }
}

Before you ship

The SDKs create an Idempotency-Key and reuse it for automatic retries. For manual retries, reuse the original key. Router can hold the connection for up to 10 minutes.

When a request fails, Router sends an X-Comfy-Error-Type response header explaining why. A 422 means Router rejected the input before calling the provider. Download generated assets promptly because result URLs can expire.

Headers

Authentication, idempotency, request IDs, error buckets, retry pacing, spend limits.

Using the Router API

Model discovery, validation errors, retries, and billing.

Limitations

What Router does not do today, and what to use instead.