Wan 3.0 first and last frame: animate between two images

Yes, Wan 3.0 can animate between two images. On Sume, send frame_images to wan-3.0 with one entry as first_frame and one as last_frame; the clip starts on the first and is generated toward the second. A last_frame on its own is refused.

Alibaba's Wan3.0 guide lists first-frame and first/last-frame control among its features, and Sume's Video generation docs give the request shape. Read 2026-09-29.

What does the request look like?

curl -X POST https://api.sume.com/v1/videos \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: wan-frames-001" \
  -d '{
    "model": "wan-3.0",
    "prompt": "The seed sprouts and grows into a tall sunflower, time-lapse, static camera",
    "duration": 8,
    "resolution": "720p",
    "frame_images": [
      { "type": "image_url", "image_url": { "url": "https://example.com/seed.png" }, "frame_type": "first_frame" },
      { "type": "image_url", "image_url": { "url": "https://example.com/sunflower.png" }, "frame_type": "last_frame" }
    ]
  }'

What are the rules?

How do I make the two frames match?

Use images with the same subject, framing and light, and describe the change between them, not the frames themselves. A start and an end that differ in everything leave the model to invent a bridge you may not want.

Does a longer clip help?

It gives the change more time. A 2 second clip suits a small move; a 10 to 30 second clip suits a large one. Price rises with seconds, so see Wan 3.0 pricing per second.