Veo 3.1 Model

Overview

Veo 3.1 (Google DeepMind) is integrated as Veo 3.1 Fast in StoryFlow.

Capabilities

Fast Generation: Quicker results compared to Sora.
First/Last Frame Interpolation: Unique feature. Specify both the first and last frames, and Veo generates smooth transitions.

Inputs

Text (Prompt): Describe video content.
Reference Image:
- Upload 1–2 images.
- 1 image: used as the first frame.
- 2 images: used as first and last frames, even if they differ greatly.

Parameters

Parameter	Type	Default	Allowed	What it does
`generationMode`	string	`FIRST_LAST_FRAMES`	`FIRST_LAST_FRAMES`, `REFERENCE_2_VIDEO`	Controls how reference images are interpreted. `FIRST_LAST_FRAMES` uses 1–2 images as start/end frames. `REFERENCE_2_VIDEO` uses 1–3 images as references.
`aspectRatio`	string	`16:9`	`16:9`, `9:16`	Sets output aspect ratio.
`resolution`	string	`720p`	`720p`, `1080p`	Sets output resolution. `1080p` is only available for `16:9`.

Tips & Constraints

First/Last Frames: Connect 1–2 images; use 16:9 for 1080p.
Reference Mode: Only supported by veo3_fast; requires 16:9 and 1–3 images.
1080p Retrieval: May take longer. If the provider falls back, you may receive 720p instead.

Sora 2 / Pro (Video)Hailuo 2.3 (Video)