AI Token Price
Google

Google · Gemini Pro family · released Feb 2026

Gemini 3.1 Pro API pricing

Estimate your costCompare with…

Google's most capable Gemini line. Gemini 3.1 Pro costs $2 / $12 per 1M tokens for prompts up to 200K tokens and $4 / $18 above that.

Input
$2.00
per 1M tokens
Output
$12.00
per 1M tokens
Cached input
$0.20
90% off input
Batch
50% off
for jobs that can wait
Context window
1M
tokens
Verified 27 Sep 2026Gemini API pricing Compared with Gemini 2.5 Pro: 60% more on input, 20% more on output

What it costs in practice

Gemini 3.1 Pro at list prices, no batch discount.

1,000 chat replies1,500 tokens in and 300 out each$6.60
Summarising 100 long reports20,000 tokens in and 800 out each$4.96
A month of a coding agent400 tasks, 85% of input cached$449

The coding-agent example assumes 85% of input is served from cache, typical for agents that resend the same context each step. Model your own workload

Details

API model IDgemini-3.1-pro-preview
ReleasedFeb 2026
Long promptsPrompts over 200K tokens: $4 / $18
Arena text score1487 (25 Sep)
StatusCurrent
  • Still labelled a preview model.
  • Prompts above 200K tokens cost $4 / $18 per 1M.

Checked 27 Sep 2026 against Gemini API pricing .

Other Gemini Pro versions

No Gemini 3.5 Pro has shipped. Gemini 2.5 Pro is only available to accounts that used it before.

Model Input / 1M Output / 1M Cached input Context Released
Gemini 2.5 ProPrevious
 $1.25 $10.00 $0.13 1M 17 Jun 2025

Gemini 2.5 Pro details

Gemini 2.5 Pro

Previous

$1.25 / $10.00 per 1M tokenscached $0.13 · batch 50% off · 1M context

Released 17 Jun 2025 · gemini-2.5-pro · Prompts over 200K tokens: $2.50 / $15

  • Only available to accounts that used it before; new users can't enable it.

Newer option: Gemini 3.1 Pro at $2.00 / $12.00. Checked 27 Sep 2026 against Gemini API pricing and Gemini 2.5 Pro model page .

Compare Gemini 3.1 Pro

Compare with any model

Price history

All changes

No price changes recorded since we began tracking in June 2026.

Google pricing rules

  • Batch requests cost 50% less.
  • Gemini 3.1 Pro charges a higher rate for prompts above 200K tokens.
  • Gemini 3.8 Flash is on a promotional price until 31 December 2026.

All Google models

Questions

How much does Gemini 3.1 Pro cost?

As of 27 Sep 2026, Gemini 3.1 Pro costs $2 per million input tokens and $12 per million output tokens, and $0.20 per million cached input tokens. Batch requests cost 50% less. Prices checked 27 Sep 2026.

What is the cheapest Gemini Pro model?

Gemini 2.5 Pro, at $1.25 / $10 per million input / output tokens.

What is Gemini 3.1 Pro's context window?

1M tokens.

Does Gemini 3.1 Pro support prompt caching?

Yes. Repeated input read from the cache costs $0.20 per million tokens, 90% less than normal input.