Veo 3.1 Fast: quick video generation with audio by Google
Veo 3.1 Fast is the fast tier of Google DeepMind's Veo 3.1 video model, released on October 15, 2025. It generates 4, 6 or 8 second clips with native audio in 720p, 1080p and 4K, noticeably faster than the flagship mode at close quality. On Genosai.io it starts from 60 credits per clip.
Updated: July 7, 2026
- Render speed — The fast tier of Veo 3.1 returns a finished clip noticeably quicker than the flagship, which suits iteration and volume content.
- Native audio — Generates speech, sound effects and ambience inside the frame, syncing dialogue to the character's lip movement.
- Clips up to 8 seconds — Creates 4, 6 or 8 second clips, and scenes can be extended into coherent episodes longer than a minute.
- 720p, 1080p and 4K — Renders in three resolutions: 720p for drafts, 1080p for editing and 4K for final shots.
- Text and image input — Works in text-to-video and image-to-video modes, animating a scene description or an uploaded frame.
- References and transitions — Keeps a character's look via reference images and builds a transition between a start and end frame with audio.
Contents
- What is Veo 3.1 Fast
- Capabilities
- Examples
- How to use on Genosai
- Prompts
- Generation cost
- How it compares
- Limitations and tips
- FAQ
What is Veo 3.1 Fast
Veo 3.1 Fast is the fast tier of the Veo 3.1 video model from Google DeepMind. Veo 3.1 itself was released on October 15, 2025, roughly five months after Veo 3 shown at Google I/O 2025. In the three-mode lineup, Fast sits in the middle: it returns a finished clip noticeably faster than the flagship Quality mode while keeping quality close to it on most scenes.
The core idea of the fast tier is iteration speed. When you are dialing in a shot, an angle or a motion, you do not want to wait minutes for each attempt. Fast generates 4, 6 or 8 second clips with native audio and, across many generations, saves meaningful time. The gap versus the standard mode mainly appears on very complex prompts with many elements moving at once.
The defining trait of the whole Veo 3.1 family is native audio. The model generates three layers simultaneously: dialogue and speech synced to lip movement, sound effects matched to on-screen action, and background ambience. Version 3.1 adds spatial audio — the stereo field follows the source, interiors gain reverb, and outdoor scenes have natural falloff.
On Genosai.io Veo 3.1 Fast is built into the video studio and runs in the browser. Pricing depends on resolution: 60 credits for 720p, 65 for 1080p and 180 for 4K per clip. If quality on a complex scene is critical, look at the flagship Veo 3.1 Quality; if you need the cheapest draft pass, look at Veo 3.1 Lite.
Capabilities
Veo 3.1 Fast is built for regular work where speed and predictability matter. Below are the areas where this shows most.
Speed and iteration
The fast tier returns a finished clip noticeably quicker than the flagship. In practice this changes the workflow: you can run through several variants of a scene, camera move and audio in a short time, then send the final shot to a heavier mode if needed. For social content, internal tasks and ad drafts, this quality level is usually enough.
Native audio
The model generates audio together with the video rather than on top of it. A single clip simultaneously produces dialogue synced to the character's lips, sound effects under the action, and the ambience of the scene. Version 3.1 spatial audio adds a sense of volume: a source leaving the frame to the left is heard on the left.
Duration and scene extension
The base clip is 4, 6 or 8 seconds. Scene extension technology stitches 8-second segments into continuous video longer than a minute: each extension builds on the final second of the previous clip, preserving visual and audio continuity. That is how short clips assemble into a whole scene.
Text-to-video and image-to-video
Fast works in two modes. In text-to-video you describe the scene in words and the model builds a moving shot with sound. In image-to-video you upload a ready image and set the motion, light and camera — the static frame comes alive. You can also set a start and end frame and get a transition between them.
References and consistency
Using up to three reference images of a character, object or scene, the model keeps a recognizable look across shots. This matters when the same hero appears in several scenes and has to stay themselves as the setting changes.
Examples
There are no demo clips yet, but here are typical scenarios where Veo 3.1 Fast shines. Below are task descriptions, not finished videos.
The first scenario is text-to-video for social media. You describe a short scene: a barista pours a latte by a coffee shop window in morning light, the camera slowly pushes in, and you hear the clink of a cup and the muted hum of the room. Fast quickly returns a vertical clip with audio, ready for Reels or Shorts — and in a couple of iterations you dial in the rhythm and light.
The second scenario is image-to-video. You upload a photo of a product on a table and ask to animate the frame: a gentle camera move around the object, a glint of light across the surface, soft ambience. The model builds the motion and sound, turning a static shot into a short product clip for a listing or a story.
The third scenario is a two-frame transition. You set a start frame (an empty scene at dawn) and an end frame (the same scene by day with the hero in the center) and get a smooth transition between them with audio. This trick suits intros, bumpers and short sequences where a controlled beginning and end matter.
How to use on Genosai
Everything runs in the browser through the video studio — no setup needed.
- Open the Genosai video studio and sign in.
- Pick Veo 3.1 Fast from the model list.
- Describe the scene and set the resolution — 720p, 1080p or 4K.
- To animate a photo, upload the image and describe the motion, camera and light.
- Describe the audio separately — lines, effects, background ambience.
- Run the generation, review the result and refine the prompt if needed.
Fast shines on quick iterations: dial in the shot and motion at 720p, then regenerate the final variant at 1080p or 4K. The more specific your camera, light and audio, the closer the result to the intent.
Prompts
Ready-made templates — swap your details for the values in angle brackets.
Text-to-video, 8 seconds: <scene>, camera move <pan/push-in>, natural light, native ambient audioVertical 9:16 clip for Reels: <hero and action>, dynamic cut, synced line "<text>"Image-to-video: animate the uploaded frame, <object motion>, subtle light glint, soft ambienceProduct clip: camera slowly orbits <product>, studio light, clean shadows, quiet backgroundTwo-frame transition: start <frame A>, end <frame B>, smooth light change, transition audioDialogue scene: <character> says "<line>", lips in sync, room tone with reverbAction 6 seconds: <dynamic action>, fast cut, sound effects under motion, 1080pGeneration cost
On Genosai Veo 3.1 Fast is priced by resolution per clip: 60 credits for 720p, 65 for 1080p and 180 for 4K. The jump to 4K is noticeable, so a sensible strategy is to find the composition, motion and audio at 720p and only render the final shot in 4K. For regular work and iteration, this is a moderately priced tier of the Veo 3.1 family.
Starter credits after sign-up let you try Veo 3.1 Fast for free, and top-ups work with Russian cards without a VPN. Current pricing and balance are in the Pricing section.
How it compares
Veo 3.1 Fast is the quick middle tier of the Veo family. Nearby in the catalog there is a higher-quality flagship, a cheaper light mode and strong competitors of the same class — the choice depends on the balance of speed, price and quality.
| Model | Class | Strength | Price per clip |
|---|---|---|---|
| Veo 3.1 Fast | Fast tier | Speed and audio at near-flagship quality | from 60 credits |
| Veo 3.1 Quality | Flagship | Top quality on complex scenes and audio | from 250 credits |
| Veo 3.1 Lite | Light tier | Cheapest draft pass | from 30 credits |
| Kling 2.5 Turbo | Competitor | Fast motion generation | from 42 credits |
If a complex scene needs maximum quality, take Veo 3.1 Quality. For cheap drafts, Veo 3.1 Lite fits, and among same-class competitors compare Kling 2.5 Turbo and Seedance 2.0 Fast. The full list of models is in the model catalog.
Limitations and tips
Fast is a trade-off between speed and quality. On very complex prompts with many objects moving at once, subtle light and long dialogue, the gap with the flagship becomes visible: if the scene is important, send the final to Veo 3.1 Quality. For drafts and previews, conversely, it is cheaper to switch to Lite.
Like any video model, Fast can slip on fine geometry, hands and complex motion physics — check important shots and refine the prompt if needed. The jump to 4K is noticeable, so find the composition at 720p and enable high resolution on the final pass.
To get the most, describe camera, light and audio separately and concretely: direction of motion, type of lighting, lines and background effects. For consistent characters supply up to three references, and for a controlled beginning and end use a start and end frame.
FAQ
What is Veo 3.1 Fast?
It is the fast tier of Google DeepMind's Veo 3.1 video model, released on October 15, 2025. It generates 4-8 second clips with native audio in 720p, 1080p and 4K noticeably faster than the flagship. On Genosai it starts from 60 credits per clip.
How does Veo 3.1 Fast differ from Veo 3.1 Quality?
Fast returns results faster and cheaper at quality close to the flagship on most scenes. Quality is stronger on very complex prompts with many moving objects and delivers the most refined audio. For social content and drafts, Fast is the smarter pick.
Does Veo 3.1 Fast have audio?
Yes. The model generates native audio in three layers: dialogue and speech synced to lips, sound effects matched to on-screen action, and background ambience. You do not need to add audio separately — it is born together with the video.
What resolution does Veo 3.1 Fast support?
On Genosai three resolutions are available: 720p, 1080p and 4K. 720p suits quick drafts, 1080p is ideal for clean editing, and 4K captures textures and fine detail for final materials.
How much does Veo 3.1 Fast generation cost on Genosai?
Pricing depends on resolution: 60 credits for 720p, 65 for 1080p and 180 for 4K per clip. It is the fast, moderately priced tier of the Veo 3.1 family, well suited to regular work and iteration.
Can Veo 3.1 Fast animate a photo?
Yes, the model works in image-to-video mode: upload a frame and describe the motion, light and sound. You can also set a start and an end frame to get a smooth transition between them with audio.