LLM Reference
OpenRouter

Using Gemini 3.1 Pro Preview Custom Tools on OpenRouter

Implementation guide · Gemini 3.1 · Google DeepMind

Serverless

OpenRouter exposes Gemini 3.1 Pro Preview Custom Tools through model ID google/gemini-3.1-pro-preview-customtools. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-06-15. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at OpenRouter and generate an API key.
  2. 2
    Use the OpenRouter SDK or REST API to call google/gemini-3.1-pro-preview-customtools — see the documentation for request format.
  3. 3
    You'll be billed $2.00/1M input, $12.00/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See OpenRouter documentation for integration details.

Pricing on OpenRouter

TypePrice (per 1M)
Input tokens$2.00
Output tokens$12.00

Capabilities

VisionMultimodalStructured Outputs

About Gemini 3.1 Pro Preview Custom Tools

Google: Gemini 3.1 Pro Preview Custom Tools available via OpenRouter. Pricing: $2/1M input, $12/1M output.

Full model details →

Model Specs

Released2026-01-01
Context1m
ArchitectureDecoder Only
Knowledge cutoff2025-01

More Models on OpenRouter

Gemini 3.1 Flash-LiteGemini 3.1 Flash Lite PreviewNano Banana 2 (Gemini 3.1 Flash Image Preview)Gemini 3.1 Pro Preview
All models on OpenRouter →

Provider

OpenRouter
OpenRouter

OpenRouter, Inc.

New York, NY, USA