- 4, 6, or 8 s
Clip length
- 720p or 1080p
Resolution
- 16:9, 9:16
Aspect ratios
- Up to 4
Candidates
About Veo 3.1 Fast
Veo 3.1 Fast is the speed-focused tier of Google's Veo 3.1 video model. It takes the same inputs as Veo 3.1 (a text prompt, an optional first frame, an optional last frame, and up to 3 reference images) and generates audio with the video in the same pass, so a draft arrives with ambience, effects, or dialogue already in sync. It is also the Masonry CLI's built-in fallback when no video model is configured.
In Masonry, Veo 3.1 Fast renders 16:9 or 9:16 clips at 1280×720 or 1920×1080, in lengths of 4, 6, or 8 seconds, and can return up to 4 candidates per request. Use it where speed and volume matter more than the last increment of polish: exploring several directions for an ad, checking whether a motion idea works, or producing social drafts. When a direction is approved, re-run the same prompt and references on Veo 3.1 for the final.
In our same-brief test of six current video models, Veo 3.1 Fast returned an 8 second 1280×720 clip with audio and spoke the scripted line word for word, but it redrew the product's logo into a different mark. Treat it as a fast draft model and check brand marks frame by frame before anything ships.
Why teams choose Veo 3.1 Fast
Choose Veo 3.1 Fast when you need many video drafts with sound quickly. It keeps the Veo 3.1 inputs (first and last frames, references, native audio) at a faster, lower-cost tier, so you can explore before you spend on a final render. Move to Veo 3.1 when a direction is approved and quality matters most, and compare Kling O3 or MiniMax H3 Max if the product or logo must stay exact, since our test caught Veo 3.1 Fast redrawing a logo.
What Veo 3.1 Fast can do
The capabilities that set Veo 3.1 Fast apart and earn its place in a brief
Native Audio in the Same Pass
Ambience, sound effects, and dialogue are generated with the picture, so a draft already sounds like the finished idea. Turn audio off with the no-audio option when you plan to add your own track.
Built for Iteration
Request up to 4 candidates at once and compare them side by side, then take the winning direction to Veo 3.1 for the final render.
First Frame, Last Frame, and References
Start from an approved image, optionally fix the closing frame, and add up to 3 reference images to keep a product or character consistent.
Landscape or Vertical at up to 1080p
Choose 1280×720 or 1920×1080 in 16:9, or 720×1280 or 1080×1920 in 9:16, for ads, YouTube, and vertical social.
Clip Lengths of 4, 6, or 8 Seconds
Pick the shortest length that shows the idea. Shorter drafts are faster to review and cheaper to repeat.
Prompt Enhancement and Negative Prompts
Let Veo expand a short prompt, or keep it literal and use a negative prompt to steer away from details you do not want.
Where teams reach for Veo 3.1 Fast
- Exploring several directions for a video ad before choosing one
- Testing whether a camera move or action reads well on a product
- Vertical social drafts for Reels, TikTok, and Shorts with sound
- Animating an approved product image as a quick motion test
- Storyboard and pre-visualization clips for a client review
- Quick video drafts for coding agents using the Masonry CLI
Frequently asked questions
What teams need to know about creating with Veo 3.1 Fast in Masonry
What is Veo 3.1 Fast?
Veo 3.1 Fast is the speed-focused tier of Google's Veo 3.1 video model. It generates short clips with native audio from a prompt or an image, and it is meant for quick drafts and iteration rather than final renders.
How is Veo 3.1 Fast different from Veo 3.1?
Both take the same inputs in Masonry (prompt, first and last frame, up to 3 references, native audio) and the same 4, 6, or 8 second lengths at up to 1080p. Fast is the quicker, lower-cost tier, so use it to explore and Veo 3.1 for the version you deliver.
How long and how large are Veo 3.1 Fast clips?
Each generation is 4, 6, or 8 seconds, at 1280×720 or 1920×1080 in 16:9, or 720×1280 or 1080×1920 in 9:16. There is no square output on this route.
Does Veo 3.1 Fast generate sound?
Yes. Audio is on by default and is generated in the same pass as the video. In our test it spoke a scripted line word for word. Turn audio off if you will add your own soundtrack.
Can Veo 3.1 Fast animate an existing image?
Yes. Give it a first frame, and optionally a last frame, and it animates between them. Up to 3 reference images help keep a product or character consistent.
Will Veo 3.1 Fast keep my logo and label exact?
Not reliably. In our same-brief test it redrew a product logo into a different mark. Check every logo and label at full size, and for exact product shots compare a model that held the logo in our tests.
How much does Veo 3.1 Fast cost in Masonry?
Masonry bills each generation in credits and shows the exact cost before you run it. Cost grows with clip length and resolution, and Fast costs less than Veo 3.1.
How do I run Veo 3.1 Fast from the command line?
Install the Masonry CLI with npm install -g @masonryai/cli, sign in with masonry login, then run masonry video with your prompt and --model veo-3.1-fast-generate-preview to choose it explicitly.
How does my team use Veo 3.1 Fast in Masonry?
Open a Masonry canvas, pick Veo 3.1 Fast from the model selector, and describe the video you need: a product shot, an ad creative, a social post. Masonry generates it, then you refine, edit, and combine Veo 3.1 Fast with other models in one workspace.
Is Veo 3.1 Fast free to try?
New Masonry accounts get 50 free credits to try GPT Image 2.5 Flare. Veo 3.1 Fast is included in every paid plan, and the editor shows the exact credit cost before you generate.
How do I write good prompts for Veo 3.1 Fast?
Describe the scene, the motion, and the sound in one prompt, and keep each draft to one idea. Once a draft works, reuse the same prompt and references on Veo 3.1 for the final, and check logos and labels at full size. See the prompt gallery on this page for real Veo 3.1 Fast prompts you can copy and adapt.
Who makes Veo 3.1 Fast?
Veo 3.1 Fast is built by Google. Inside Masonry it runs alongside 50+ image and video models, so your team can pick the right one for each brief without switching tools.
Can I see examples made with Veo 3.1 Fast?
Yes, the prompt gallery on this page shows real videos teams have generated with Veo 3.1 Fast in Masonry, each paired with the exact prompt you can copy and adapt for your own brand.
Start creating with Veo 3.1 Fast
Generate, edit, and compare across 50+ models in one workspace.
Guides for Veo 3.1 Fast
Prompt walkthroughs and examples from the Masonry blog
Explore more AI models
Compare Veo 3.1 Fast with other models teams run in Masonry