Model Guide

Veo 3.1

Veo 3.1 is provided by ToAPIs with General capabilities. Current pricing reference: Pay-as-you-go pricing. This page helps you understand positioning, parameters, and production-ready use cases before integration.

Vendor

ToAPIs

Modalities

General

Price

Pay-as-you-go pricing

Updated

Open in Playground Docs

Model Overview

Quick Answer

Veo 3.1 supports Text-to-Video, Image-to-Video, R2V, and Video Edit in one workflow.
Use this model guide page to validate parameters with minimal request/response examples.
Stabilize prompts here first, then move to production API integration.

Veo 3.1 Model Features

Core Section

Core capabilities and practical engineering value

Unified multi-mode testing

Switch across Text-to-Video, Image-to-Video, R2V, and Video Edit in one place.

Parameter-first validation

Iterate quickly on prompts, durations, and references before production rollout.

Production-ready handoff

Minimal request/response structure helps you move stable configs into API workflows.

How to Use Veo 3.1 API

Fill prompt and key parameters.
Run, inspect output structure, then iterate.
Move stable settings into production API.

Key Parameters

Parameter	Type	Required	Default	Range	Description
model	string	Yes	gemini_omni	-	Model identifier. Use the fixed value `gemini_omni`.
prompt	string	Yes	-	-	Main instruction describing the subject, action, scene, and style.
aspect_ratio	string	No	16:9	16:9 \| 9:16	Video aspect ratio. Defaults to `16:9`, corresponding to landscape or portrait output.
duration	integer	No	6	6 \| 10	Output duration in seconds. Defaults to `6` and currently supports only `6` and `10`.
resolution	string	No	720P	720P	Output resolution. Currently only `720P` is supported; if omitted, the default value is used.

Common Errors

400 invalid_request_error

Trigger: Request payload misses required fields or has invalid field types.

Fix: Validate model, mode, and input schema before request.

Retry: Retry only after fixing payload; avoid blind retries.

401 authentication_error

Trigger: Missing Authorization header or invalid API key.

Fix: Verify Bearer token format and API key scope.

Retry: Retry after auth fix; rotate key if repeated failures continue.

429 rate_limit_exceeded

Trigger: Request rate, concurrency, or current quota hits upstream rate limiting.

Fix: Apply exponential backoff first, then review request rate, concurrency, and quota usage.

Retry: Use exponential backoff (e.g., 1s/2s/4s) with jitter; if it persists, reduce submission pressure.

500 internal_error

Trigger: Transient upstream error or internal processing failure.

Fix: Capture request id and trigger retry workflow.

Retry: Retry 2-3 times with short delays; escalate if persistent.

FAQ

When should I use Veo 3.1?

Use it to validate video concepts quickly, compare mode behavior, and converge prompts before API rollout.

How do I choose Text-to-Video vs Image-to-Video?

Use Text-to-Video when you only have instructions; use Image-to-Video when you already have key frames or composition.

What is the difference between R2V and Video Edit?

R2V focuses on reference-guided generation, while Video Edit focuses on modifying existing video assets.

Image or video model error: invalid apitype: -1

This usually means the request was sent to the wrong endpoint. Image and video models typically do not use the chat endpoint. Instead, submit the documented HTTP task request and poll the task status endpoint for results. Check the actual request code, URL, and payload first.

An image or video task failed, but the user was still charged

Ask the user for the task log or screenshot first and check whether input or output token usage appears. If token accounting shows up, the request was likely sent through a chat endpoint instead of the proper media workflow. Image and video models usually run as async HTTP task APIs: submit the task first, then poll by task id according to the relevant docs.

Mode Notes

Text to Video with Veo 3.1

Generate videos directly from prompts.

Mode Parameters

modelpromptaspect_ratiodurationresolution

Best Scenarios

Ad storyboard preview
Shot draft generation
Social content prototyping