GoogleHow to Use Veo 3.1 Fast
Make a Veo 3.1 Fast video in the CheaperGen Studio — no code, no install, no Google account. Pick a mode, write one clear prompt, set the resolution and length and press Generate. A test costs $0.30; developers can follow the API tutorial instead.
- Modes
- 2
- Text → Video · Image → Video
- Test clip
- $0.30
- 4 s · 720p
- Length
- 4, 6, 8 s
- up to 4K
- Failed runs
- $0
- refunded automatically
Prompt builder
Build a Veo 3.1 Fast prompt
Fill in the parts of the shot; the prompt assembles itself. Send it to the playground below and run it — the steps after it explain each part.
Your Veo 3.1 Fast prompt
Fill in a few boxes — or start from the example — and the prompt appears here.
Try it
Try Veo 3.1 Fast here
Runs on your balance at the price on the button; failed runs are refunded. Results are saved to your account.
Before you start
Which Veo 3.1 Fast mode to use
Veo 3.1 Fast has 2 modes. Pick by what you already have.
| Mode | You give it | Best for | From |
|---|---|---|---|
| Text → Video | A prompt | Ideas from scratch: scenes, b-roll, concepts and storyboards. | $0.0736/s |
| Image → Video | A first frame, optionally a last frame, and a prompt | Bringing a picture you already have to life: a product shot, a character, an artwork. With a last frame: transitions and loops. | $0.0736/s |
Step by step
How to use Veo 3.1 Fast in 6 steps
- 1
Open Veo 3.1 Fast in the Studio
Open the Studio (it opens with Veo 3.1 Fast selected), or choose the Video tab and pick Veo 3.1 Fast in the model menu. Sign in with Google or your email; you pay per generation from prepaid credits.
- 2
Choose what to make
- Text → Video — a prompt.
- Image → Video — a first frame, optionally a last frame, and a prompt. Add it under “First frame” (and “Last frame” for a transition).
- 3
Write the prompt
One shot per prompt works best. Cover these, in plain sentences:
- Subject. Who or what is on screen, with the details that must stay consistent: age, clothing, materials, colours.
- Action. One clear action in the present tense. Keep it to one beat for short clips.
- Camera. Shot size and movement: close-up, wide, dolly-in, orbit, handheld, drone.
- Scene and light. Location, time of day, and where the light comes from.
- Style. Lens, film look, colour grade or animation style.
- Sound. Veo 3.1 Fast can add native audio (billed at a higher rate): describe ambience, effects or dialogue when generate_audio is on.
More structure and examples: the Veo 3.1 Fast prompt guide.
- 4
Set the options
The settings sit under the prompt; rarely needed ones are behind ⋯. What each does — and to the price — is in the table below.
- 5
Generate
The exact price is shown before you run: press Generate (or ⌘/Ctrl + Enter). The amount is held from your balance and refunded in full if the generation fails.
- 6
Download and iterate
Results appear above the prompt; download them from there. Change one thing per try — the prompt, the camera move or a setting — so you know what helped. Compare runs the same prompt on several models side by side, and Code shows the same request for the API.
Settings
Veo 3.1 Fast settings explained
For Text → Video; the other modes add their inputs (frames, references or images to edit). Prices are per second.
| Setting | Choices | Default | What it does | Price |
|---|---|---|---|---|
| Aspect ratio | 16:9, 9:16 | 16:9 | Landscape or portrait. | Changes the price |
| Resolution | 720p, 1080p, 4K | 720p | Output resolution. 1080p and 4K clips are always 8 seconds; 4K costs more per second. | $0.0736–$0.23/s |
| Duration | 4s, 6s, 8s | 8s | Clip length: 4, 6 or 8 seconds at 720p (1080p and 4K are always 8 s). You pay per second. | Price scales with length |
| Generate audio | On / off | On | Generate synchronized sound, ambience and dialogue. Clips with audio are billed at a higher per-second rate. | Audio is billed at a higher rate |
| Negative prompt(⋯) | Free text | — | Things to avoid in the output. | No effect on the price |
| Seed(⋯) | Free text | — | Use the same seed and settings to reproduce a result. Leave empty for random. | No effect on the price |
Every tier and a calculator: Veo 3.1 Fast API Pricing.
Worked example
A first prompt to try
Text → Video with the default settings. Paste it into the Studio and change one thing at a time.
“A golden retriever puppy chases bubbles in a sunny backyard, slow motion, happy barking”
Aspect ratio: 16:9 · Resolution: 720p · Duration: 8s · Generate audio: On
$0.60$0.80 for this clip
Try it in the StudioAvoid these
Common Veo 3.1 Fast mistakes
Drafting at 4K + audio
Every try at 4K + audio costs 3.8× one at 720p. Settle the composition and motion at 720p, then render the keeper at the resolution you deliver.
Leaving audio on for drafts
Native audio is billed at a higher rate. Turn Audio off while you iterate; switch it on for the final take, or add sound in your editor.
Expecting one long take
One generation is up to 8 seconds (4, 6, 8 s). Plan longer pieces as several shots, and keep the subject consistent with the same first frame in each.
Several actions in one prompt
Give each clip one clear action and one camera move. A list of events in one prompt usually gets merged or skipped.
Describing what you don't want
Prompts work better when they describe what should be on screen. "No blur" or "no extra fingers" can pull the result towards the very thing you name.
FAQ
How to use Veo 3.1 Fast: questions
Veo 3.1 Fast is developed by Google. CheaperGen provides API access and does not own the model. Trademarks belong to their respective owners.