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GoogleVideo

Veo 3.1 Fast

The faster, cheaper Veo tier for drafting shots with native audio.

video/veo3.1-fast
Try it in StudioUse with your agent or API

She spins around once in a full graceful twirl while a whirlwind of golden leaves wraps around her; as she comes back to face the camera her casual clothes have transformed into an elegant fantasy ranger outfit with a green hooded cloak, leather bracers and a bow on her back, and she strikes a confident pose. The camera slowly circles her. One continuous shot, no cuts, consistent character, correct anatomy and hands, no text, no logos, no captions.

Price
15 credits / second
Makes
Text to video, Image to video
Clip length
4 to 8 s

Best for

Veo 3.1 Fast is the speed tier of Google's Veo 3.1. It generates short 720p clips with native audio from a prompt or a starting image, which makes it a good first pass before committing to the full Veo 3.1 tier.

  • Drafting cutscene ideas quickly before paying for a premium render.
  • Animating sprite or character art to test how a motion reads.
  • Short social clips announcing an update or a jam entry.

Put it together

Where Veo 3.1 Fast fits in a game, with the models it works well with. Your agent runs every step.

Price

ModeModelPrice
Text to videoVeo 3.1 Fast15 credits / second
Image to videoVeo 3.1 Fast15 credits / second

Paid from your Summer credits.

Use it from code or your agent

Sign in once with summer login. Your agent or your code then runs it with your paid credits.

npx -y summer-engine@latest login
npx -y summer-engine@latest api run video/veo3.1-fast \
  --input '{"prompt":"a dragon circling a castle at dawn","duration":5}' \
  --download .

video/veo3.1-fast: $0.15 per second of video. Paid from your Summer credits.

Inputs

What input takes for video/veo3.1-fast. Send only what you need; Summer fills in tested defaults.

  • promptstringup to 4000 characters

    What happens in the clip. Needed without imageUrl.

  • imageUrlstringup to 2048 characters

    A public image URL to animate (image to video).

  • endImageUrlstringup to 2048 characters

    With imageUrl: the last frame. The same image as imageUrl makes a seamless loop. Models with an end frame: Seedance, Kling 3, Wan, Vidu, LTX 2.5, Luma, MiniMax.

  • referenceImageUrlsarray of string1 to 10 items

    Reference to video: public images of the characters, props or style to keep (with a reference model, e.g. kling-4-ref). Motion transfer: the character to move.

  • videoUrlstringup to 2048 characters

    An input clip (public URL, at most 20 s): restyle or reframe it, move a character with its motion, or add sound to it (e.g. kling-video-to-audio). Billed on the clip's length.

  • durationintegerDefault 5 · 1 to 20

    Seconds; the model renders its nearest supported length.

  • aspectRatioenumDefault 16:9
    • 16:9
    • 9:16
    • 1:1
    • 4:3
    • 3:4
    • 21:9
    • 3:2
    • 2:3
    • auto
  • negativePromptstringup to 1000 characters

    What the clip must not show.

  • resolutionenum

    Only a quality the model offers; leave out for its default.

    • 720p
    • 1080p
    • 4k
    • 480p
    • 768p
    • 2k
    • 768P
    • 1080P
    • 480P

Model docs · Summer API docs · Set up the Summer MCP server · Try it in the browser

Questions

What is Veo 3.1 Fast good for in game development?
Veo 3.1 Fast is the speed tier of Google's Veo 3.1. It generates short 720p clips with native audio from a prompt or a starting image, which makes it a good first pass before committing to the full Veo 3.1 tier. Typical game uses: drafting cutscene ideas quickly before paying for a premium render; animating sprite or character art to test how a motion reads; short social clips announcing an update or a jam entry.
How much does Veo 3.1 Fast cost in Summer?
In Summer Studio: Veo 3.1 Fast (text to video): 15 credits / second; Veo 3.1 Fast (image to video): 15 credits / second. It is charged from your Summer credits.
What can Veo 3.1 Fast generate, and how long are the clips?
In Summer, Veo 3.1 Fast supports text to video and image to video. Generated clips run 4, 6, and 8 seconds, in 16:9 and 9:16 aspect ratios at 720p, 1080p, and 4K.
Can I use Veo 3.1 Fast from Claude Code, Cursor or Codex?
Yes. Connect the Summer MCP server to Claude Code, Cursor, Codex or another MCP client, then ask your agent to generate with summer_generate_video with model: "veo3.1-fast". Setup instructions are at summerengine.com/mcp.
Where do Veo 3.1 Fast results go?
Every generation is saved to your Summer asset library. From there you can download it or bring it into a Summer Engine project.