Veo 3.1 Fast API
About
Veo 3.1 Fast is a high-performance LLM available via the LLM Gateway API, ideal for scalable text generation and natural language processing. This model delivers available completely free of charge. Access Veo 3.1 Fast via the LLM Gateway API with up to 1 output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
No
Structured Output
No
Tool Use
No
WeightsClosed
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
33K
Tokens
Input Limit
33K
Tokens
Max Output
1
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Frequently Asked Questions
Veo 3.1 Fast by LLM Gateway costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
ID
veo-3.1-fast-generate-preview
Provider
LLM GatewayFamily
gemini
Release Date
Mar 14, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
LLMGATEWAY_API_KEY
API Base URL
https://api.llmgateway.io/v1