Google · MultimodalReleased 2025-11-18

gemini-3.1-pro

google/gemini-3.1-pro-preview id

This model improves upon Gemini 2.5 Pro and is catered towards challenging tasks, especially those involving complex reasoning or agentic workflows. Improvements highlighted include use cases for coding, multi-step function calling, planning, reasoning, deep knowledge tasks, and instruction following.

Tool useReasoningChatWeb searchLong contextPreview
Type
Use gemini-3.1-pro
# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$
$ const { text } = await generateText({
$ model: 'google/gemini-3.1-pro-preview',
$ baseURL: 'https://synapse.garden/api/v1',
$ apiKey: process.env.MG_KEY,
$ prompt: 'Why is the sky blue?',
$ })
1M
CONTEXT WINDOW
64K
MAX OUTPUT
$2.20/M
INPUT · PER M
$13.20/M
OUTPUT · PER M
PRICING

List prices, every modality.

RatePer million tokens · USD
Input$2.20/M
Output$13.20/M
Cache read$0.220/M
Honest list pricesHow we calculate prices
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FAQ · GEMINI-3.1-PRO

Frequently asked

01 / 04

How do I call gemini-3.1-pro from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘google/gemini-3.1-pro-preview and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does gemini-3.1-pro cost?

Input: $2.20/M per million tokens. Output: $13.20/M per million tokens. The free tier includes a million tokens every month at no cost.

03 / 04

What's the context window for gemini-3.1-pro?

gemini-3.1-pro supports a context window of 1M tokens, with a maximum output of 64K tokens.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try gemini-3.1-pro in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.