Gemini 3.1 Pro (Preview) API
About
Build advanced reasoning agents with Gemini 3.1 Pro (Preview), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $2.00/1M input and $12.00/1M output tokens, native tool calling support. Access Gemini 3.1 Pro (Preview) via the LLM Gateway API with up to 66K output tokens.
Capabilities
Input Modalities
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Output Modalities
text
Reasoning
Yes
Structured Output
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
66K
Tokens
Pricing
Standard (per 1M tokens)
Input
$2.00
Output
$12.00
Caching (per 1M tokens)
Read
$0.20
Frequently Asked Questions
Gemini 3.1 Pro (Preview) by LLM Gateway costs $2.00 per 1M input tokens and $12.00 per 1M output tokens. Cached reads cost $0.20 per 1M tokens.
Model Details
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
LLMGATEWAY_API_KEY
API Base URL
https://api.llmgateway.io/v1