Google: Gemini 3.1 Pro (Preview)

Name: Gemini 3.1 Pro (Preview) API
Brand: Google

preview

Gemini 3.1 Pro (Preview) is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

gemini-3.1-pro-previewgemini-3released Feb 19, 2026

Provider Quick start

Context

1.0M

tokens

Max output

65.5K

tokens

Input

$2.00

per 1M

Output

$12.00

per 1M

Activity

Daily period usage

Aggregated managed Everstack traffic. Buckets below 5 tenants or 100 requests are withheld.

Providers

ProviderContextInput /MOutput /M

Google

1.0M$2.00$12.00

Pricing

Item	Price	Unit
Input	$2.00	per 1M tokens
Output	$12.00	per 1M tokens
Cache read	$0.20	per 1M tokens

Performance

Reliability

Compare

Compare usage and performance

Place this model beside up to three other catalog models.

Capabilities

Modalities

Input

Output

Details

Model ID: gemini-3.1-pro-preview
Family: gemini-3
Status: preview
Knowledge: -
Released: Feb 19, 2026

Gateway Config

API: 2024-01-01
Auth: GOOGLE_API_KEY
Discovery: static
Provider type: static

Quick Start

index.ts

import Everstack from "@everstack/node";const client = new Everstack({  apiKey: process.env.EVERSTACK_API_KEY!,  baseUrl: "https://{instance}.{region}.everstack.ai",});const completion = await client.chat.completions.create({  model: "@google/gemini-3.1-pro-preview",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL

https://generativelanguage.googleapis.com/v1

Chat completions

https://generativelanguage.googleapis.com/v1/chat/completions

Model

gemini-3.1-pro-preview

Auth env

GOOGLE_API_KEY

Gemini 3.1 Pro (Preview) FAQ

How much does the Gemini 3.1 Pro (Preview) API cost?

Through Google, Gemini 3.1 Pro (Preview) costs $2.00 per 1M input tokens and $12.00 per 1M output tokens.

What is the context window of Gemini 3.1 Pro (Preview)?

Gemini 3.1 Pro (Preview) accepts up to 1.0M tokens of context and returns up to 65.5K output tokens on Google.

What can Gemini 3.1 Pro (Preview) do?

Gemini 3.1 Pro (Preview) supports chat, function calling, image input and reasoning. It accepts text, image, video, audio and PDF input.

How do I call Gemini 3.1 Pro (Preview) through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @google/gemini-3.1-pro-preview. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.