gemini-3.1-pro-preview

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Integration guide

Overview

gemini-3.1-pro-preview is available on MAX API through the OpenAI-compatible API.

Pricing

Official list prices in USD. Token prices are per 1M tokens.

Input ≤ 200,000 tokens

Input: $2
Output: $12
Cache read: $0.2

Input > 199,999 tokens

Input: $4
Output: $18
Cache read: $0.4

Tier	Input	Output	Cache read
Input ≤ 200,000 tokens	$2	$12	$0.2
Input > 199,999 tokens	$4	$18	$0.4

This model uses tiered pricing: the tier is chosen by the total input length of each request.

Cache read applies to prompt tokens served from the prompt cache; cache write applies to tokens written into it.

Example request

curl https://<your-endpoint>/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-3.1-pro-preview",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

https://<your-endpoint> is a placeholder. Your endpoint is shown in the console after you sign in.