Google: Gemini 3.1 Pro Preview

proprietary

Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows.

Context
1.0M
Max output
66K
Input price
$2/1M tokens
Output price
$12/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDgoogle/gemini-3.1-pro-preview
Provider OpenRouter
Creator Google AI
Familygemini-3.1
Licenseproprietary
Statusactive
Typechat
Input modalitiesaudio, image, text, video
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1.0M tokens
Max input—
Max output66K tokens
Reasoning tokens—
Knowledge cutoff
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$2
Output
$12
Cache write
—
Cache read
$0.2
Batch in
—
Batch out
—

Family Comparison: gemini-3.1

ModelContextMax outPricing
Google: Gemini 3.1 Flash Lite (batch)1.0M66K$0.13$0.75
Google: Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)66K59K$0.25$1.5
Google: Gemini 3.1 Flash Lite Preview1.0M66K$0.25$1.5
Google: Gemini 3.1 Flash Lite1.0M66K$0.25$1.5
Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview)66K59K$0.5$3
Google: Nano Banana 2 (Gemini 3.1 Flash Image)131K33K$0.5$3
Google: Gemini 3.1 Pro Preview (batch)1.0M66K$1$6
Google: Gemini 3.1 Pro Preview Custom Tools1.0M66K$2$12
Google: Gemini 3.1 Pro Preview1.0M66K$2$12

API

GET/v1/models/openrouter/google/gemini-3.1-pro-preview