Veo 3.1 Fast Extend Video overview
Veo 3.1 Fast Extend Video by Google
With optional audio synthesis (on/off toggle), Veo 3.1 Fast empowers creators to tailor multimodal experiences without compromising quality or workflow agility.
Veo 3.1 Fast Extend Video specs
- Model ID
veo3.1/fast/extend-video- Developer
- Input
- Text, Video
- Output
- Video
- Endpoint
POST https://api.aimlapi.com/v2/video/generations
High-Speed Video Extension with Audio Control
Veo 3.1 Fast Extend Video revolutionizes video generation by streamlining the extension workflow. This iteration delivers identical extend capabilities as prior versions but at a fraction of the cost and with dramatically faster iteration times. Optimized for creators needing quick refinements, it introduces flexible audio on/off modes to support both silent visuals and full soundtracks.
Why Choose?
For teams prioritizing speed, cost-efficiency, and editorial control, Veo 3.1 Fast redefines iterative video creation. It’s not just faster, it’s smarter: preserving context, supporting multimodal choices, and integrating seamlessly into high-volume workflows. Whether you're scaling ad campaigns or prototyping film sequences, Veo 3.1 Fast delivers studio-quality extensions at developer-friendly speeds.
Technical Specifications
Veo 3.1 Fast Extend focuses on efficiency without sacrificing quality, targeting real-time workflows.
- Input Types: Video clips (MP4, AVI up to 1080p), text prompts, image references for style transfer.
- Output Resolution: Up to 1080p at 30 FPS; supports 4K upscaling via post-processing.
- Extension Length: 2-10 seconds per iteration; chainable for longer videos.
- Audio Modes: On (generative soundtrack synced to visuals) / Off (silent video only).
- Model Size: 12B parameters, optimized for edge deployment.
Performance Benchmarks
Independent tests on standard datasets (e.g., UCF-101, Kinetics-400) highlight Veo 3.1's edge in speed and economy.
Key Features
This model prioritizes speed and flexibility for iterative creative processes.
- Rapid extension workflow appends seamless footage to existing videos using context-aware diffusion.
- Audio toggle enables silent generation for lip-sync edits or full audio synthesis with environmental sounds and dialogue.
- Cost-efficient scaling handles high-volume tasks like batch extensions without premium pricing.
- Style consistency preserves motion dynamics, lighting, and semantics across extensions.
Use Cases
Veo 3.1 excels in fast-paced production environments requiring quick video tweaks.
- Social Media Clips: Extend short TikTok/Reels videos with matching audio for viral loops.
- Advertising Prototyping: Rapidly iterate ad extensions, toggling audio to test voiceover vs. music.
- Film Previs: Append scenes to storyboards cost-effectively during early editing.
- E-Learning Videos: Silently extend tutorials, adding narration only in final passes.
- Gaming Assets: Generate looping animations with/without SFX for trailers or cinematics.
Use cases
Extending short AI-generated videos is a documented use case for this model, letting creators continue an existing Veo-generated clip rather than starting over.
Building longer cinematic sequences is another stated use case, since the model extends previously generated footage into a longer finished video.
Social media ad continuation is also listed, with examples such as extending ads, promos, and Shorts/Reels with extra moments or alternate endings.
Rapid iteration for fast-turn video production is a documented fit, especially for workflows that need quick creative feedback and speedy turnaround.
Veo 3.1 Fast Extend Video API pricing
| Usage | Price | Unit |
|---|---|---|
| Video generation | $0.1 | per second |
| Additional | $0.195 | per /sec |
The final price depends on request parameters such as resolution or duration.
Prices from the AI/ML API price list, checked on Nov 4, 2026.
Veo 3.1 Fast Extend Video vs other video models: prices
AI/ML API rates for 5 models, per second.
| Model | Per second |
|---|---|
 Veo 3.1 Fast Extend Video | $0.1 |
| Veo 3.1 Lite | $0.03 |
| Veo 3.1 Fast | $0.08 |
| Gemini Omni 1.1 Flash | $0.1014 |
| Veo 3.1 | $0.2 |
How to use the Veo 3.1 Fast Extend Video API
View docs
Build with your agent
Give your agent the model details, code and documentation.
1Get your API key
Create API keyexport AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"2Make your first request
curl 'https://api.aimlapi.com/v2/video/generations' \
-H "Authorization: Bearer $AIMLAPI_KEY" \
-H 'Content-Type: application/json' \
-d '{
"model": "veo3.1/fast/extend-video",
"prompt": "A slow dolly shot through a sunlit greenhouse full of ferns, light dust in the air, natural camera motion",
"video_url": "https://example.com/input.mp3"
}'import os
import requests
headers = {
"Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
"Content-Type": "application/json",
}
payload = {
"model": "veo3.1/fast/extend-video",
"prompt": "A slow dolly shot through a sunlit greenhouse full of ferns, light dust in the air, natural camera motion",
"video_url": "https://example.com/input.mp3"
}
response = requests.post("https://api.aimlapi.com/v2/video/generations", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())const response = await fetch("https://api.aimlapi.com/v2/video/generations", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
"model": "veo3.1/fast/extend-video",
"prompt": "A slow dolly shot through a sunlit greenhouse full of ferns, light dust in the air, natural camera motion",
"video_url": "https://example.com/input.mp3"
}),
});
if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());The request returns a generation id. Poll GET https://api.aimlapi.com/v2/video/generations?generation_id=<id> until the status is completed.
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Veo 3.1 Fast Extend Video FAQ
What inputs and outputs does Veo 3.1 Fast Extend Video support?
Veo 3.1 Fast Extend Video takes video as input and returns video.
How much does Veo 3.1 Fast Extend Video cost?
Veo 3.1 Fast Extend Video costs $0.1 per second on AI/ML API, billed as you go with no subscription.
How is Veo 3.1 Fast Extend Video billed?
Veo 3.1 Fast Extend Video costs $0.1 per second on AI/ML API, billed as you go with no subscription.
Who created Veo 3.1 Fast Extend Video?
Veo 3.1 Fast Extend Video was built by Google.
How do I call Veo 3.1 Fast Extend Video on AI/ML API?
Send a request to v2/video/generations with veo3.1/fast/extend-video as the model id.
Is Veo 3.1 Fast Extend Video available through a single API key?
Yes. Veo 3.1 Fast Extend Video is served through AI/ML API, so the same key and endpoint format used for other models applies.
What is the Veo 3.1 Fast Extend Video model ID?
Use veo3.1/fast/extend-video as the model parameter. Requests go to https://api.aimlapi.com/v2/video/generations with your AI/ML API key.