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Every Gemini Model, Explained

Which Gemini model to pick and why: Gemini 3.1 Pro, Gemini 3 Flash, Gemini 3.1 Flash-Lite, what each one is built for, the 1 million token context window they share, and what the Free, Google AI Pro and AI Ultra plans include. Each guide is verified against Google's own documentation at its date.

Model facts are Google's published specs at each article's date. AI Toolbox works with every Gemini model and lets you file conversations by model in folders.

Same workflows, every AI

Guides for the other AI Toolbox modules

One extension, four modules, each with its own guide collection shaped by what that platform lacks.

FAQ

Quick answers before you read

What Gemini models are available in 2026?

Google's current lineup is Gemini 3.1 Pro, Gemini 3 Flash, Gemini 3.1 Flash-Lite. Gemini 3.1 Pro is the most capable model for complex reasoning, long documents and agentic coding; Gemini 3 Flash gives frontier-class performance at a fraction of the cost; Gemini 3.1 Flash-Lite is the lowest-cost option. The 2.5 generation is deprecated.

Which Gemini model should I use?

For hard reasoning, long context and coding, Gemini 3.1 Pro. For everyday and high-volume work that still needs strong quality, Gemini 3 Flash. For the lowest cost per token, Gemini 3.1 Flash-Lite. All three share a 1 million token context window, so the choice is about capability and price rather than how much fits.

What do the Gemini plans cost?

Gemini has a Free tier, Google AI Pro at $19.99 a month, and Google AI Ultra at $99.99 or $199.99 a month, with the higher tiers unlocking more Pro-model usage, Deep Research capacity and Workspace features. The pricing guide above lists what each plan includes and the API costs per model, as of its publication date.

Does the model I use change how AI Toolbox works?

No. AI Toolbox is a browser-extension layer on top of gemini.google.com, so search, folders, bookmarks, export and the prompt library behave the same with Gemini 3.1 Pro, Gemini 3 Flash, Gemini 3.1 Flash-Lite, and all future Google Gemini models. It does not replace your Google plan or give access to a model your plan does not include. The Context Meter reads the window of the model you are on.

Does AI Toolbox work in Edge, Brave or Firefox?

It installs from the Chrome Web Store into any Chromium browser: Chrome, Edge, Brave, Opera and Arc. There is no Firefox version.

Pricing

Free to start, one lifetime price if you stay

Every guide works on the free plan. Premium removes the caps on one platform; All Access covers all four. Not an AI subscription: you keep using your own Gemini account.

Free

$0forever

  • 2 root folders, 5 search results per query, unlimited TXT export
  • All four modules, no account needed
Install free

Gemini Premium

$9.99/ month, or $99 once

  • Unlimited folders, search results, bookmarks and exports
  • Lifetime pays for itself in under 10 months
See Gemini plans
  • 14-day money-back on a first purchase
  • Conversations stay in your browser
  • Chrome Web Store listing, 4.7/5

Put the guides to work

Add AI Toolbox and try the first guide in two minutes

Install once, then folders, full-text search and export appear inside Gemini. The free plan has no time limit.