Model	Endpoint	Input	Cost (credits/sec)
`gen4.5`	`POST /v1/image_to_video` or `POST /v1/text_to_video`	Text and/or Image	12
`gen4_turbo`	`POST /v1/image_to_video`	Image required	5
`gen4_aleph`	`POST /v1/video_to_video`	Video + Text/Image	15
`act_two`	`POST /v1/character_performance`	Image/Video	5
`veo3`	`POST /v1/image_to_video` or `POST /v1/text_to_video`	Text/Image	40
`veo3.1`	`POST /v1/image_to_video` or `POST /v1/text_to_video`	Text/Image	20-40
`veo3.1_fast`	`POST /v1/image_to_video` or `POST /v1/text_to_video`	Text/Image	10-15

Video duration: 2-10 seconds. Aspect ratios: 1280:720, 720:1280, 1104:832, etc.

Image Generation

Model	Endpoint	Cost (credits)
`gen4_image`	`POST /v1/text_to_image`	5 (720p), 8 (1080p)
`gen4_image_turbo`	`POST /v1/text_to_image`	2
`gemini_2.5_flash`	`POST /v1/text_to_image`	5

Audio Generation

Model	Endpoint	Use Case	Cost
`eleven_multilingual_v2`	`POST /v1/text_to_speech`	Text to speech	1 credit/50 chars
`eleven_text_to_sound_v2`	`POST /v1/sound_effect`	Sound effects	1-2 credits
`eleven_voice_isolation`	`POST /v1/voice_isolation`	Isolate voice from audio	1 credit/6 sec
`eleven_voice_dubbing`	`POST /v1/voice_dubbing`	Dub audio to other languages	1 credit/2 sec
`eleven_multilingual_sts_v2`	`POST /v1/speech_to_speech`	Voice conversion	1 credit/3 sec

Characters (Real-Time Avatars)

Model	Description	Session Max Duration
`gwm1_avatars`	Real-time conversational avatars powered by GWM-1	5 minutes

Endpoints:

Method	Endpoint	Description
`POST`	`/v1/avatars`	Create a new Avatar
`GET`	`/v1/avatars/{id}`	Retrieve an Avatar
`PATCH`	`/v1/avatars/{id}`	Update an Avatar (name, voice, personality, documentIds)
`DELETE`	`/v1/avatars/{id}`	Delete an Avatar
`POST`	`/v1/realtime_sessions`	Create a new real-time session
`GET`	`/v1/realtime_sessions/{id}`	Retrieve session status (poll until `READY`)
`POST`	`/v1/realtime_sessions/{id}/consume`	Consume session credentials for WebRTC (one-time use)

Avatar creation parameters:

Parameter	Type	Description
`name`	string	Display name for the avatar
`referenceImage`	string	URL or `runway://` URI of the character image
`voice`	object	`{ type: 'runway-live-preset', presetId: 'clara' }`
`personality`	string	System prompt / personality instructions
`documentIds`	string[]	Optional. IDs of knowledge base documents to attach

Voice presets: clara (soft), victoria (firm), vincent (authoritative). Preview all at dev.runwayml.com.

Session statuses: NOT_READY → READY → RUNNING → COMPLETED (or FAILED / CANCELLED)

Documents (Knowledge Base)

Method	Endpoint	Description
`POST`	`/v1/documents`	Create a document (plain text or Markdown)
`GET`	`/v1/documents/{id}`	Retrieve a document
`DELETE`	`/v1/documents/{id}`	Delete a document

Each Avatar supports up to 50,000 tokens of knowledge. Link documents to an Avatar via client.avatars.update(id, { documentIds: [...] }).

Management Endpoints

Method	Endpoint	Description
`GET`	`/v1/tasks/{id}`	Get task status and output
`DELETE`	`/v1/tasks/{id}`	Cancel/delete a task
`POST`	`/v1/uploads`	Create ephemeral upload
`GET`	`/v1/organization`	Organization info & credit balance
`POST`	`/v1/organization/usage`	Credit usage history (up to 90 days)

Task Lifecycle

All generation endpoints return a task object. The flow is:

Submit — POST /v1/<endpoint> → returns { "id": "task_xxx" }
Poll — GET /v1/tasks/{id} → returns task with status
Retrieve output — When status === "SUCCEEDED", the output array contains signed URLs

Task Statuses

Status	Meaning
`PENDING`	Queued, waiting to start
`RUNNING`	Currently generating
`SUCCEEDED`	Complete — output URLs available
`FAILED`	Generation failed — check `failure` field
`THROTTLED`	Concurrency limit hit — auto-queued

SDK Polling (Recommended)

The SDKs provide a waitForTaskOutput() method that handles polling automatically:

// Node.js — polls until complete (default 10 min timeout)
const task = await client.imageToVideo.create({
  model: 'gen4.5',
  promptImage: 'https://example.com/image.jpg',
  promptText: 'A sunset timelapse',
  ratio: '1280:720',
  duration: 5
}).waitForTaskOutput();

console.log(task.output); // Array of signed URLs

# Python
task = client.image_to_video.create(
    model='gen4.5',
    prompt_image='https://example.com/image.jpg',
    prompt_text='A sunset timelapse',
    ratio='1280:720',
    duration=5
).wait_for_task_output()

print(task.output)

Manual Polling (REST)

async function pollTask(taskId) {
  while (true) {
    const response = await fetch(`https://api.dev.runwayml.com/v1/tasks/${taskId}`, {
      headers: {
        'Authorization': `Bearer ${process.env.RUNWAYML_API_SECRET}`,
        'X-Runway-Version': '2024-11-06'
      }
    });
    const task = await response.json();

    if (task.status === 'SUCCEEDED') return task;
    if (task.status === 'FAILED') throw new Error(task.failure);

    await new Promise(r => setTimeout(r, 5000)); // poll every 5 seconds
  }
}

Output Handling

Successful tasks return an output array with signed URLs to generated content
Output URLs expire within 24-48 hours
Download and store outputs in your own storage — do not serve signed URLs to end users
Video outputs are MP4, image outputs are PNG/JPEG

Input Requirements

Size Limits

Type	Via URL	Via Data URI	Via Upload
Image	16 MB	5 MB	200 MB
Video	32 MB	16 MB	200 MB
Audio	32 MB	16 MB	200 MB

Supported Formats

Images: JPEG, PNG, WebP (no GIF)
Video codecs: H.264, H.265/HEVC, AV1, VP8/VP9, Apple ProRes, Theora
Audio: MP3, AAC, FLAC, PCM, ALAC

URL Requirements

If providing assets via URL:

HTTPS only (no HTTP)
Domain names only (no IP addresses)
No redirects
Must support HTTP HEAD requests
Must return valid Content-Type and Content-Length headers
Max URL length: 2,048 characters

Rate Limits & Tiers

Tier	Concurrency	Daily Gens	Monthly Cap	Unlock
1 (default)	1-2	50-200	$100	—
2	3	500-1,000	$500	1 day + $50
3	5	1,000-2,000	$2,000	7 days + $100
4	10	5,000-10,000	$20,000	14 days + $1,000
5	20	25,000-30,000	$100,000	7 days + $5,000

No requests-per-minute limit — only daily generation quotas
Exceeding concurrency → THROTTLED status (auto-queued, not rejected)
Exceeding daily limit → 429 Too Many Requests
Daily limits use a rolling 24-hour window

Error Handling

HTTP Errors

Code	Meaning	Action
400	Input validation failure	Fix input, do not retry
401	Invalid API key	Check key, do not retry
429	Rate limited	Retry with exponential backoff + jitter
502/503/504	Server overload	Retry with exponential backoff + jitter

Task Failure Codes

Code	Meaning	Retry?
`SAFETY.INPUT.*`	Input content moderation	No — not refundable
`SAFETY.OUTPUT.*`	Output content moderation	Yes — try different prompt
`INTERNAL.BAD_OUTPUT`	Quality issue	Yes
`ASSET.INVALID`	Bad input format	Fix input
`INTERNAL`	Server error	Yes

The SDKs handle retries for transient errors automatically.

Data URI Support

Base64-encoded images can be passed instead of URLs:

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA...

Useful for small images or when you don't want to host the file. Subject to the data URI size limits above.

api-reference

Runway Public API Reference

Models & Endpoints

Video Generation