Runway Grok Imagine 1.5 credits per second vs Sume's rate

Runway's API pricing page, read 2026-10-01, lists grok_imagine_1_5 at 10 credits per second at 480p, 16 at 720p and 29 at 1080p, plus 1 credit per image or audio reference. Credits are sold at $0.01 each, so a 5-second 720p clip is $0.80 before references.

On Sume the same model family is grok-imagine-video-1.5, with one per-second rate for both of its resolutions. A 5-second clip reserves $0.07 and a 10-second clip $0.13, at list x 1.25 rounded up to the cent.

How do the two price sheets compare?

The numbers are for each company's own product, so treat them as two quotes, not a like-for-like discount.

What does Sume's row not do?

The catalog row is narrower than the model Runway sells. It is image-to-video only, so image_url or first_frame_url is required, it has no end frame, no reference inputs and no audio, and it accepts 4 to 15 seconds at 480p or 720p. There is no 1080p tier and no aspect_ratio. See the video docs.

How do I call it?

Send the start image and a motion prompt. Sume reserves the amount at submit and releases it if the job fails.

curl -X POST https://api.sume.com/v1/videos \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: grok-run-001" \
  -d '{
    "model": "grok-imagine-video-1.5",
    "prompt": "Slow push-in, the lantern sways in the wind",
    "duration": 5,
    "resolution": "720p",
    "frame_images": [
      {
        "type": "image_url",
        "image_url": { "url": "https://example.com/lantern.png" },
        "frame_type": "first_frame"
      }
    ]
  }'