> ## Documentation Index
> Fetch the complete documentation index at: https://docs.venice.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Flux 3 Extend API

> Flux 3 Extend API on Venice: text to video, up to 4K and 20s clips, priced per clip with /video/quote. Anonymized access without your identity. Generates audio.

> [accordion] Plain-text specification
>
> ## Flux 3 Extend API
>
> Flux 3 Extend is a text to video model by Black Forest Labs, available on the Venice API as `flux-3-extend-video`. Requests are anonymized, so the provider never sees your identity.
>
> ### Flux 3 Extend API pricing
>
> | Model ID | Variant | Privacy | Price |
> | - | - | - | - |
> | `flux-3-extend-video` | Text to video | Anonymized | priced by source |
>
> ### Flux 3 Extend specifications
>
> | Spec | Value |
> | - | - |
> | Provider | Black Forest Labs |
> | Released | Aug 4, 2026 |
> | Privacy | Anonymized |
> | Status | Stable |
> | Modes | text to video |
> | Resolutions | 720p, 1080p, 1440p, 4K |
> | Durations | 5s, 10s, 15s, 20s |
> | Aspect ratios | auto, 21:9, 16:9, 4:3, 1:1, 3:4, 9:16, 9:21 |
> | Audio | Always generated |
>
> ### How to use the Flux 3 Extend API
>
> Send requests to `POST https://api.venice.ai/api/v1/video/queue` with `"model": "flux-3-extend-video"` and your API key.
>
> ```bash theme={"system"}
> # 1. Queue the job (returns a queue_id)
> curl https://api.venice.ai/api/v1/video/queue \
>   -H "Authorization: Bearer $VENICE_API_KEY" \
>   -H "Content-Type: application/json" \
>   -d '{
>     "model": "flux-3-extend-video",
>     "prompt": "Slow aerial drone shot over a misty mountain valley at golden hour",
>     "duration": "5s",
>     "resolution": "720p",
>     "aspect_ratio": "auto",
>     "video_url": "https://example.com/source.mp4"
>   }'
>
> # 2. Poll until the MP4 is ready
> curl https://api.venice.ai/api/v1/video/retrieve \
>   -H "Authorization: Bearer $VENICE_API_KEY" \
>   -H "Content-Type: application/json" \
>   -d '{ "model": "flux-3-extend-video", "queue_id": "<queue_id>" }' --output video.mp4
> ```
>
> ### Related models
>
> * [MiniMax H3 Enhanced API](https://docs.venice.ai/models/minimax-h3-enhanced.md): from \$0.10 / sec
> * [Seedance 2.5 API](https://docs.venice.ai/models/seedance-2-5.md): from \$0.1685 / sec
> * [Wan 3.0 API](https://docs.venice.ai/models/wan-3-0.md): from \$0.065 / sec
> * [MiniMax H3 API](https://docs.venice.ai/models/minimax-h3.md): from \$0.10 / sec


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