Gemini 3.1 Pro Preview Custom Tools

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Data updated on September 30, 2026· 217 models

GoogleCustom Tools

Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...

Reasoning estimated
Speed estimated
Input
Output
Context
1 M tokens
Max output
66 K
Input, $ per 1M tokens
$2.00
Output, $ per 1M tokens
$12.00
Cache read, $ per 1M
$0.200
Batch (input / output)
—
Tool calling
Yes
Released
02/19/2026
Knowledge cutoff
2025-01
API id
google/gemini-3.1-pro-preview-customtools

Summary from the data

Gemini 3.1 Pro Preview Custom Tools is a Google model available by API since 02/19/2026. It costs $2.00 per million input tokens and $12.00 per million output tokens, accepts 1 M tokens of context and generates up to 66 K tokens per response. Input: text, audio, image, video, PDF / file; output: text. It has a reasoning mode. It supports tool calling. With 10,000 requests a month of 1,500 input and 400 output tokens it would cost about $78.00 a month.

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What would your product cost?

Estimate the monthly cost with your app's real volume. List prices, no cache or batch discounts.

Gemini 3.1 Pro Preview Custom Tools
$78.00/mo

The 6 cheapest for this scenario (chat, last 12 months)

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Frequently asked questions

How much does Gemini 3.1 Pro Preview Custom Tools cost per million tokens?

Gemini 3.1 Pro Preview Custom Tools costs $2.00 per million input tokens and $12.00 per million output tokens (USD, list price). Cache read: $0.200. Batch tier: not published.

What context window does Gemini 3.1 Pro Preview Custom Tools have?

Gemini 3.1 Pro Preview Custom Tools accepts 1 M tokens of context per request and generates up to 66 K tokens per response.

Does Gemini 3.1 Pro Preview Custom Tools accept images, audio or files?

Input: text, audio, image, video, PDF / file. Output: text.

Does Gemini 3.1 Pro Preview Custom Tools have a reasoning mode and tool calling?

It has a reasoning mode. It supports tool calling.

When was Gemini 3.1 Pro Preview Custom Tools released and what is its knowledge cutoff?

Gemini 3.1 Pro Preview Custom Tools has been available by API since 02/19/2026. Knowledge cutoff: 2025-01.

What would an app built on Gemini 3.1 Pro Preview Custom Tools cost?

With 10,000 requests a month of 1,500 input and 400 output tokens, Gemini 3.1 Pro Preview Custom Tools would cost about $78.00 a month at list price, without cache or batch discounts.

What is the API id of Gemini 3.1 Pro Preview Custom Tools?

The id is google/gemini-3.1-pro-preview-customtools. It is the name passed in the model parameter of the API (or on OpenRouter).

Where do the prices come from and how often are they updated?

From the public catalogs of OpenRouter, models.dev and LiteLLM, which publish each provider's list prices. They sync once a day and the last update date is shown above the comparison.

What does price per million tokens mean?

It is what the provider charges per million tokens you send (input) or the model generates (output). A token is roughly 4 characters. Output almost always costs more than input.

Sources: OpenRouter, models.dev and LiteLLM. Prices in USD per million tokens, list price, no volume discounts. Prompt tokens are an estimate; each provider's tokenizer may differ.