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AI models · Google

Gemini 3.1 Pro Preview: release date and what it's for

Released , according to Google's changelog. The only Pro-tier Gemini you can call, and Google still labels it preview seven months in. Prompts over 200K tokens bill at double.

Status
Preview
Released
Lab
Google
Input
$2per million tokens
Output
$12per million tokens
Context window
1.05Mtokens
Max output
66Ktokens

API model ID: gemini-3.1-pro-preview

What we've written about Gemini 3.1 Pro Preview

September 23, 2026

Gemini models explained: 3.8 Flash vs Flash-Lite vs 3.1 Pro, with every release date

Google has shipped six Flash and Flash-Lite models since May, but the newest Pro you can call is still a February preview.

How Gemini 3.1 Pro Preview compares on price and context

Price per million tokens

inputoutput

  1. GPT-6 Astra$10 / $50
  2. Claude Fable 5.1$10 / $50
  3. Gemini 3.1 Pro Preview$2 / $12
  4. Muse Spark 1.3$1.25 / $4.25
  5. Gemini 3.8 Flash$0.75 / $3.75
  6. Gemini 3.7 Flash$0.75 / $3.75
  7. Gemini 3.6 Flash$0.75 / $3.75
Context window, in tokens

how much it reads at once

  1. GPT-6 Astra1.05M
  2. Gemini 3.1 Pro Preview1.05M
  3. Gemini 3.8 Flash1.05M
  4. Gemini 3.7 Flash1.05M
  5. Gemini 3.6 Flash1.05M
  6. Muse Spark 1.31.05M
  7. Claude Fable 5.11M

Next to the newest Google models and the current model from other labs. Prices are in US dollars per million tokens.

What is Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview is a model from Google, built in the US. You can use it, but the lab still calls it a preview, so expect it to change.

When did Gemini 3.1 Pro Preview come out?

Google released it on February 19, 2026. That date comes from Google's changelog.

More from Google

GoogleLive

Gemini 3.8 Flash

in /1M
$0.75
out /1M
$3.75
context
1.05M
GoogleLive

Gemini 3.7 Flash

in /1M
$0.75
out /1M
$3.75
context
1.05M
GoogleLive

Gemini 3.6 Flash

in /1M
$0.75
out /1M
$3.75
context
1.05M
GoogleLive

Gemini 3.5 Flash-Lite

in /1M
$0.30
out /1M
$2.50
context
1.05M
GoogleLive

Gemini 3.5 Flash

in /1M
$1.50
out /1M
$9
context
1.05M
GoogleLive

Gemini 3.1 Flash-Lite

in /1M
$0.25
out /1M
$1.50
context
1.05M
GooglePreview

Gemini 3 Flash Preview

in /1M
$0.50
out /1M
$3
context
1.05M
GoogleAnnounced

Gemini 4 Argon

in /1M
$2
out /1M
$10

More news: Google AI news: Gemini and DeepMind updates

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