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Google: Gemini 3.1 Pro Preview Custom Tools pricing

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… Google: Gemini 3.1 Pro Preview Custom Tools from OpenRouter costs $2.00 per 1M input tokens and $12.00 per 1M output tokens. Cached input is $0.200 per 1M. Context window 1,048,576 tokens.

API id google/gemini-3.1-pro-preview-customtools · OpenRouter · source · updated 2026-09-25 · general-purpose

$2.00
Input / 1M tokens
$12.00
Output / 1M tokens
$0.200
Cached input / 1M
1M
Context window

Google: Gemini 3.1 Pro Preview Custom Tools specifications

Provider
OpenRouter
API id
google/gemini-3.1-pro-preview-customtools
Model type
general-purpose
Context window
1M tokens
Max output
66K tokens
Currency
USD
Price source
Provider API
Last checked
2026-09-25

Tags

  • flagship
  • preview
  • vision

What Google: Gemini 3.1 Pro Preview Custom Tools costs in practice

Estimated cost at common usage volumes
WorkloadInput tokensOutput tokensEstimated cost
Short chat turn1,000500$0.0080
Document summary50,0002,000$0.12
1M tokens in, 200K out1,000,000200,000$4.40

Estimates use the standard tier and ignore caching discounts, so real bills with repeated prompt prefixes are typically lower.

Common questions

How much does Google: Gemini 3.1 Pro Preview Custom Tools cost per 1M tokens?
Google: Gemini 3.1 Pro Preview Custom Tools costs $2.00 per 1M input tokens and $12.00 per 1M output tokens on the standard tier. Cached input is $0.200 per 1M.
What is Google: Gemini 3.1 Pro Preview Custom Tools's context window?
Google: Gemini 3.1 Pro Preview Custom Tools accepts up to 1,048,576 tokens in a single request, and can return up to 65,536 output tokens.
Is there a cheaper OpenRouter model than Google: Gemini 3.1 Pro Preview Custom Tools?
Yes. OpenAI: GPT-3.5 Turbo is $0.500 per 1M input tokens versus $2.00 for Google: Gemini 3.1 Pro Preview Custom Tools, with a 16,385 token context window.
Where does this Google: Gemini 3.1 Pro Preview Custom Tools price come from?
From the OpenRouter catalogue, because OpenRouter does not publish machine-readable pricing. OpenRouter is a reseller, so its rate can differ from OpenRouter's own — verify before committing spend.

Head-to-head comparisons

Other OpenRouter models

See all OpenRouter pricing →