Gemini 3.1 Pro Preview Custom Tools

Google audiochatreasoningtool_usevideovision Long

API ID: google/gemini-3.1-pro-preview-customtools-20260219

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Input Price
$2.00
/1M tokens
Output Price
$12.00
/1M tokens
Cached Input
$0.20
Save 90%

About Gemini 3.1 Pro Preview Custom 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 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.

💰
Price Ranking
#44 lowest price among 47 Audio models

Model Specifications

Context Length
1.0M
Max Output
66k
Release Date
2026-02-25
Capabilities
audio chat reasoning tool_use video vision
Input Modalities
textaudioimagevideofile
Output Modalities
text

Best For

  • Complex reasoning, math problems, multi-step logic
  • Image analysis, document understanding, visual Q&A
  • Conversations, content writing, general assistance

Consider Alternatives For

  • Simple Q&A (cheaper models available)

💰 Real-World Cost Examples

Estimated monthly costs for common use cases

Personal AI Assistant
$4.50
/month
50 conversations/day, ~500 tokens each
Customer Service Bot
$138.00
/month
1000 tickets/day, ~800 tokens each
Data Analysis Pipeline
$189.00
/month
500 analyses/day, ~2k tokens each
Calculate Your Custom Usage

Google Model Lineup

Compare all models from Google to find the best fit

Model Input Output Context Capabilities
Gemini 3.1 Pro Preview Custom Tools Current Free Free 1.0M audio chat reasoning tool_use video vision
Gemma 3n 4B Free Free 33k chat
Gemini 2.5 Flash Image Preview (Nano Banana) Free Free 33k chat vision image_gen
Gemma 3n 2B (free) Free Free 8k chat tool_use
Gemma 1 2B Free Free 8k chat
Gemma 1 2B Free Free 8k chat
View All Google Models →

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🚀 Quick Start

Get started with Gemini 3.1 Pro Preview Custom Tools API

Google AI Python SDK 
import google.generativeai as genai

genai.configure(api_key="YOUR_API_KEY")
model = genai.GenerativeModel("gemini-3.1-pro-preview-customtools-20260219")

response = model.generate_content("Hello!")
print(response.text)

Resources

Continue Your Decision

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