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Veo 3.1 Fast text-to-video: Real-time AI Video Generator

google-deepmind/veo-3-1/fast/text-to-video

Generate rapid, cinematic videos with synchronized audio, prompt expansion, adjustable durations, resolutions, aspect ratios, seeds, and automatic safety fixes.

1. Get started

Use RunComfy's API to run google-deepmind/veo-3-1/fast/text-to-video. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/google-deepmind/veo-3-1/fast/text-to-video \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "Rainy alley chase; footsteps splash through puddles as a handheld camera follows from behind, neon signs flicker overhead, tense atmosphere."
  }'

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/google-deepmind/veo-3-1/fast/text-to-video \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "Rainy alley chase; footsteps splash through puddles as a handheld camera follows from behind, neon signs flicker overhead, tense atmosphere."
  }'

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": "Rainy alley chase; footsteps splash through puddles as a handheld camera follows from behind, neon signs flicker overhead, tense atmosphere."
    },
    "aspect_ratio": {
      "title": "Aspect Ratio (W:H)",
      "description": "",
      "type": "string",
      "enum": [
        "16:9",
        "9:16",
        "1:1"
      ],
      "default": "16:9"
    },
    "duration": {
      "title": "Duration",
      "description": "",
      "type": "integer",
      "enum": [
        4,
        6,
        8
      ],
      "default": 6
    },
    "negative_prompt": {
      "title": "Negative Prompt",
      "description": "",
      "type": "string",
      "default": ""
    },
    "seed": {
      "title": "Seed",
      "description": "",
      "type": "integer",
      "maximum": 99999,
      "minimum": 10000,
      "default": 63772
    },
    "enable_prompt_expansion": {
      "title": "Magic Prompt",
      "description": "Whether to enhance the video generation prompt.",
      "type": "boolean",
      "default": true
    },
    "resolution": {
      "title": "Resolution",
      "description": "",
      "type": "string",
      "enum": [
        "720p",
        "1080p"
      ],
      "default": "720p"
    },
    "generate_audio": {
      "title": "Generate Audio",
      "description": "",
      "type": "boolean",
      "default": true
    },
    "auto_fix": {
      "title": "Auto Fix",
      "description": "Whether to automatically attempt to fix prompts that fail content policy or other validation checks by rewriting them.",
      "type": "boolean",
      "default": true
    }
  }
}

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" }
      }
    }
  }
}