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Google: Gemini 3.1 Pro Preview Custom Tools

google/gemini-3.1-pro-preview-customtools
Feb 25, 20261.0M context65.5K max output$2.00/M in · $12.00/M outReasoning

Description

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 or user-defined functions are available. This specialized preview endpoint significantly increases function calling reliability and ensures the model selects the most appropriate tool in coding agents and complex, multi-tool workflows.

It retains the core strengths of Gemini 3.1 Pro, including multimodal reasoning across text, image, video, audio, and code, a 1M-token context window, and strong software engineering performance.

Specifications

Provider
google
Context Length
1.0M
Max Output
65.5K
Modality
Intextaudioimagevideofile
Outtext

Pricing

Type≤200K>200K
Input$2.00$4.00
Output$12.00$18.00
Cache Read$0.20$0.40
Cache Write$0.38$0.38
Audio Input$2.00$4.00
Audio Cache$0.20$0.40
Reasoning$12.00
Image Input$2.00
Web Search$0.01 / call

Quick Start

curl https://api.ominigate.ai/v1/chat/completions \
  -H "Authorization: Bearer sk-omg-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-3.1-pro-preview-customtools",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
Google: Gemini 3.1 Pro Preview Custom Tools — Pricing & API on OminiGate