How much does Gemini 3.1 Pro Preview Custom Tools cost?

Gemini 3.1 Pro Preview Custom Tools costs $2.00 per million input tokens and $12 per million output tokens on standard pricing. A workload of 20M input and 5M output tokens a month is about $100.

What is the context length of Gemini 3.1 Pro Preview Custom Tools?

Gemini 3.1 Pro Preview Custom Tools accepts up to 1,048,576 tokens (1M) of input and can return up to 65,536 tokens in one response.

Does Gemini 3.1 Pro Preview Custom Tools support tool calling and structured outputs?

Yes, Gemini 3.1 Pro Preview Custom Tools supports function/tool calling and structured (JSON) outputs. Supported tools: Function calling, Structured outputs, JSON mode, Reasoning, Deterministic seed, Prompt caching.

What inputs and outputs does Gemini 3.1 Pro Preview Custom Tools support?

Gemini 3.1 Pro Preview Custom Tools accepts Text, Audio, Image, Video, PDF as input and produces Text as output.

When was Gemini 3.1 Pro Preview Custom Tools released?

Gemini 3.1 Pro Preview Custom Tools was released by Google in 2026-02-25.

Gemini 3.1 Pro Preview Custom Tools

gemini-3.1-pro-preview-customtools

API Provider site

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... Built by Google.

Prices updated recently

Input price

$2.00

per 1M tokens · Standard

Output price

$12

per 1M tokens · Standard

Input limit

tokens

Output limit

66K

tokens

Input formats

TextImageVideoAudioPDF

Output formats

TextImageVideoAudioPDF

Compare

Gemini 3.1 Pro Preview Custom Tools price history

2 price records since 9/25/2026

Gemini 3.1 Pro Preview Custom Tools cost calculator

Input20M tokens

Output5M tokens

$100/month

Standard pricing

Overview

What is Gemini 3.1 Pro Preview Custom Tools?

Gemini 3.1 Pro Preview Custom Tools is a text & reasoning and vision model from Google. 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... Its 1M context window and $2.00 input price make it a candidate for quality-focused production applications.

Image understandingDocument analysisContent workflowsClassification

Rates

Gemini 3.1 Pro Preview Custom Tools pricing

Pricing is based on token usage. Provider-specific caching, batch, regional, and tool charges may affect the final cost.

Input · Standard

$2.00

Per 1M tokens

Cached input · Standard

$0.20

Per 1M tokens

Capabilities

Gemini 3.1 Pro Preview Custom Tools Tools

Tools available when using Gemini 3.1 Pro Preview Custom Tools through supported provider APIs.

Function calling

Supported

Structured outputs

Supported

JSON mode

Supported

Reasoning

Supported

Built-in web search

Not supported

Log probabilities

Not supported

Deterministic seed

Supported

Parallel tool calls

Not supported

Prompt caching

Supported

Strengths and limitations

Strengths

Priced at $2.00 input and $12 output per million tokens.
1M context supports large documents, repositories and extended conversations.
Supports text & reasoning and vision workloads in one model.

Limitations

Generated tokens cost 6× more than input tokens, which matters for verbose responses.
Large context capacity does not guarantee consistent retrieval across the entire prompt.
Arena Elo and MMLU-Pro are directional; test accuracy, latency and reliability on your own workload before committing.

Arena Elo, MMLU-Pro and pricing figures are illustrative; validate current vendor terms before purchase.

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