Developers who need Google's strongest reasoning in the API will pay $2 and $12 per million tokens, with no free tier.

Kenning's take

What it does

Gemini 3.1 Pro is the upgraded core of the Gemini 3 series and the base for Deep Think. Google reported 77.1% on the ARC-AGI-2 reasoning test, more than double Gemini 3 Pro. It is in the Gemini app with higher limits on AI Pro and Ultra, in NotebookLM for Pro and Ultra users, and in preview in the Gemini API.

• Stronger reasoning than Gemini 3 Pro
• Agentic and coding tasks
• 1 million token context in paid plans
• Available in Antigravity, Gemini CLI and Android Studio

Who it suits. People with hard reasoning, research or coding tasks, and developers needing Google's top model.

Key facts

Category

AI models

Part of

Google Gemini

Made by

Google

Based in

United States

Released

19 February 2026

How to get it

Gemini app (higher limits on Google AI Pro and Ultra), NotebookLM for Pro and Ultra, Gemini API preview, Vertex AI and Gemini Enterprise

Works on

Web, Android, iOS, API

In the UK

Yes

Free plan

No free tier in the Gemini API

API price

$2.00 / $12.00 per million input/output tokens up to 200k tokens; $4.00 / $18.00 above 200k

FAQ

Facts from the maker's own pages and the sources listed. Checked 2026-10-11.