Gemini 3.1 Pro Preview
Google Gemini 3.1 Pro Preview — pricing, 1049k context window, API cost calculator and alternatives.
By Google
Specs
- Provider
- Slug
- google/gemini-3-1-pro-preview
- Capabilities
- vision, tools, json_mode
Pricing freshness
- Tier
- standard
- Currency
- USD
- As of
- 2026-05-08 17:08 UTC
Pricing history
Tracking Gemini 3.1 Pro Preview pricing since 2026-05-08. We'll plot the chart here once it changes.
Quickstart — call Gemini 3.1 Pro Preview from your app
curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3-1-pro-preview:generateContent" \
-H "Content-Type: application/json" \
-H "x-goog-api-key: $GOOGLE_API_KEY" \
-d '{
"contents": [{"parts": [{"text": "Hello!"}]}]
}'Official docs: https://ai.google.dev/api/generate-content
# pip install google-genai
from google import genai
client = genai.Client() # reads GOOGLE_API_KEY from env
resp = client.models.generate_content(
model="gemini-3-1-pro-preview",
contents="Hello!",
)
print(resp.text)Official docs: https://ai.google.dev/api/generate-content
// npm install @google/genai
import { GoogleGenAI } from "@google/genai";
const ai = new GoogleGenAI({ apiKey: process.env.GOOGLE_API_KEY });
const resp = await ai.models.generateContent({
model: "gemini-3-1-pro-preview",
contents: "Hello!",
});
console.log(resp.text);Official docs: https://ai.google.dev/api/generate-content
Related models
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Frequently asked questions
What is Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview is a large language model API from Google with a 1M-token context window. It costs $2 per 1M input tokens and $12 per 1M output tokens.
How much does Gemini 3.1 Pro Preview cost?
Gemini 3.1 Pro Preview is priced at $2 per 1M input tokens and $12 per 1M output tokens via the Google API. A 50/50 input/output workload of 1M total tokens costs about $7.
What is the context window of Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview supports up to 1M tokens of context per request — roughly 2097 pages of English text or 131072 lines of code at a typical density.
Does Gemini 3.1 Pro Preview support vision, tool use, or JSON mode?
Gemini 3.1 Pro Preview supports vision, tool/function calling, and structured JSON mode.
Who makes Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview is built and operated by Google. Pricing, context window, and capabilities on this page are refreshed nightly from Google's public catalog.
Can I self-host Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview is API-only — its weights are not publicly distributed by Google, so it cannot be self-hosted today.