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Gemini 3.1 Pro Preview pricing and routing profile

Gemini 3.1 Pro Preview from Google lists at $2.00 per million input tokens and $12.00 per million output tokens, with a 1,048,576-token context window. Prices from OpenRouter's catalogue on 2026-09-28.

Input, per 1M tokens$2.00

Output, per 1M tokens$12.00

Cached input, per 1M$0.20

Context window1.05M

Confidence signalNot exposed

Tool callingStructured outputReasoning control

Cost per 1,000 requests

Request shape	List cost
Classification or routing (600 tokens in, 10 out)	$1.32
Chat reply (2,000 in, 400 out)	$8.80
Retrieval-augmented answer (8,000 in, 500 out)	$22.00

Before prompt caching. Try your own shape in the cost calculator.

Can Gimbix route to it first?

Not as a first-answer model through OpenRouter: no host returns token log probabilities for Gemini 3.1 Pro Preview. It can still be the model Gimbix falls back to when a cheaper model is unsure.

Who serves Gemini 3.1 Pro Preview

Host	Input / output per 1M	Log probabilities	Uptime, last 30 min
Google	$1.00 / $6.00	no	99.3%
Google AI Studio	$1.00 / $6.00	no	—
Google	$2.00 / $12.00	no	99.9%
Google AI Studio	$2.00 / $12.00	no	100.0%
Google	$3.60 / $21.60	no	—
Google AI Studio	$3.60 / $21.60	no	—

A host that lists log probabilities may still omit them; Gimbix checks each one before relying on it.

Cheaper models that can answer first

Models priced below Gemini 3.1 Pro Preview that expose a confidence signal. Whether they answer your traffic as well is what a Gimbix pilot measures.

Model	Input / output per 1M	Cheaper on a chat reply
Grok 4.7	$1.60 / $4.80	42%
Qwen3.7 Max	$1.48 / $4.42	46%
GLM 5.1	$1.40 / $4.40	48%
Qwen3.6 Max Preview	$1.03 / $6.16	49%
Grok 4.3	$1.25 / $2.50	60%
Grok 4.20 Multi-Agent	$1.25 / $2.50	60%

Compare Gemini 3.1 Pro Preview

Questions

How much does Gemini 3.1 Pro Preview cost?

Gemini 3.1 Pro Preview lists at $2.00 per million input tokens and $12.00 per million output tokens on OpenRouter as of 2026-09-28. A typical chat reply of 2,000 input and 400 output tokens costs about $8.80 per 1,000 requests.

What is the context window of Gemini 3.1 Pro Preview?

1,048,576 tokens.

Can a cheaper model replace Gemini 3.1 Pro Preview?

Sometimes. Gimbix proves it on your own traffic before routing: the cheaper model must match Gemini 3.1 Pro Preview on one half of your requests and make at most three answers worse on the other.