Runway Gen 4 Image Serverless API
Runway's Gen-4 Image API enables precise, multimodal image generation for innovative creative and technical applications.
POST /v2/runway-gen4-image · submit + poll 1# pip install "segmind>=1.1.0"
2# export SEGMIND_API_KEY="YOUR_API_KEY"
3import segmind
4
5# Async (v2): submit to the queue and block until COMPLETED.
6# run() returns the final result dict (600s deadline, 1.0s poll by default).
7result = segmind.run(
8 "runway-gen4-image",
9 promptText="photo of a model wearing a cloth and standing in a garden.",
10 referenceImages=[{"uri": "https://segmind-inference-inputs.s3.amazonaws.com/c226e2cf-49ea-4b8d-a630-9847c0efbbce-Beach-walk.png", "tag": "model"}, {"uri": "https://segmind-resources.s3.amazonaws.com/output/cfda480d-86f3-4230-aed3-fcfae874df3b-saree.webp", "tag": "cloth"}],
11 ratio="1280:720",
12)
13print(result["status"]) # COMPLETED
14print(result.get("output")) # model output (e.g. media URL)
15print(result["metrics"]["inference_time"]) # server compute seconds
16
17# --- Or submit + poll manually (track request_id, control the cadence) ---
18from segmind import SegmindClient, InferenceFailed, InferenceTimeout
19
20client = SegmindClient() # reads SEGMIND_API_KEY
21payload = {
22 "promptText": "photo of a model wearing a cloth and standing in a garden.",
23 "referenceImages": [{"uri": "https://segmind-inference-inputs.s3.amazonaws.com/c226e2cf-49ea-4b8d-a630-9847c0efbbce-Beach-walk.png", "tag": "model"}, {"uri": "https://segmind-resources.s3.amazonaws.com/output/cfda480d-86f3-4230-aed3-fcfae874df3b-saree.webp", "tag": "cloth"}],
24 "ratio": "1280:720",
25}
26job = client.submit_async("runway-gen4-image", **payload)
27print(job.request_id) # available immediately
28try:
29 result = job.wait(timeout=600, interval=1.0)
30except InferenceTimeout as e:
31 print("still running:", e.request_id)
32except InferenceFailed as e:
33 print("failed:", e.detail) 1# pip install "segmind>=1.1.0"
2# export SEGMIND_API_KEY="YOUR_API_KEY"
3import segmind
4
5# Async (v2): submit to the queue and block until COMPLETED.
6# run() returns the final result dict (600s deadline, 1.0s poll by default).
7result = segmind.run(
8 "runway-gen4-image",
9 promptText="photo of a model wearing a cloth and standing in a garden.",
10 referenceImages=[{"uri": "https://segmind-inference-inputs.s3.amazonaws.com/c226e2cf-49ea-4b8d-a630-9847c0efbbce-Beach-walk.png", "tag": "model"}, {"uri": "https://segmind-resources.s3.amazonaws.com/output/cfda480d-86f3-4230-aed3-fcfae874df3b-saree.webp", "tag": "cloth"}],
11 ratio="1280:720",
12)
13print(result["status"]) # COMPLETED
14print(result.get("output")) # model output (e.g. media URL)
15print(result["metrics"]["inference_time"]) # server compute seconds
16
17# --- Or submit + poll manually (track request_id, control the cadence) ---
18from segmind import SegmindClient, InferenceFailed, InferenceTimeout
19
20client = SegmindClient() # reads SEGMIND_API_KEY
21payload = {
22 "promptText": "photo of a model wearing a cloth and standing in a garden.",
23 "referenceImages": [{"uri": "https://segmind-inference-inputs.s3.amazonaws.com/c226e2cf-49ea-4b8d-a630-9847c0efbbce-Beach-walk.png", "tag": "model"}, {"uri": "https://segmind-resources.s3.amazonaws.com/output/cfda480d-86f3-4230-aed3-fcfae874df3b-saree.webp", "tag": "cloth"}],
24 "ratio": "1280:720",
25}
26job = client.submit_async("runway-gen4-image", **payload)
27print(job.request_id) # available immediately
28try:
29 result = job.wait(timeout=600, interval=1.0)
30except InferenceTimeout as e:
31 print("still running:", e.request_id)
32except InferenceFailed as e:
33 print("failed:", e.detail)API Endpoint
https://api.segmind.com/v1/runway-gen4-imageParameters
promptTextrequiredstringDescribes the desired animation. Use 'rainforest waterfall' for nature or 'cyberpunk alley' for futurism.
referenceImagesrequiredobject[]Upload images and select appropriate labels
urioptionalstring (uri)A list of images and tags.
tagrequiredstringTag for this image
ratiooptionalstringSets output aspect ratio. Choose 1280:720 for YouTube or 1920:1080 for HD movies.
"1280:720""1280:720""720:1280""1104:832""832:1104""960:960""1584:672""1920:1080""1080:1920"Response Type
Returns: Image
Asynchronous requests (v2)
Use Async for video, long-running (>~60s), or high-concurrency workloads; Sync is simplest for fast image & LLM calls. Async submits a request and you poll it to completion.
- 1
POST /v2/runway-gen4-imageSubmit — returns request_id, status_url, response_url
- 2
GET /v2/requests/{id}/statusPoll — until COMPLETED or FAILED
- 3
GET /v2/requests/{id}Result — final response body
Status states
- A FAILED request is served as HTTP 422 — the body still carries the error detail.
- An unknown or expired request_id returns HTTP 404.
- Results are retained for 1 hour, then expire.
- Content / RAI blocks surface as FAILED, not a separate state.
- Track completion by polling the status endpoint.
Common Error Codes
The API returns standard HTTP status codes. Detailed error messages are provided in the response body.
Bad Request
Invalid parameters or request format
Unauthorized
Missing or invalid API key
Forbidden
Insufficient permissions
Not Found
Model or endpoint not found
Insufficient Credits
Not enough credits to process request
Rate Limited
Too many requests
Server Error
Internal server error
Bad Gateway
Service temporarily unavailable
Timeout
Request timed out