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NanoGPT

Gemini 3.1 Pro (Preview Custom Tools) API

NanoGPT
About

Build advanced reasoning agents with Gemini 3.1 Pro (Preview Custom Tools), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $2.00/1M input and $12.00/1M output tokens, native tool calling support. Access Gemini 3.1 Pro (Preview Custom Tools) via the NanoGPT API with up to 66K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
1.0M

Tokens

Input Limit
1.0M

Tokens

Max Output
66K

Tokens

Pricing

Standard (per 1M tokens)

Input
$2.00
Output
$12.00

Caching (per 1M tokens)

Read
$0.20
Frequently Asked Questions

Gemini 3.1 Pro (Preview Custom Tools) by NanoGPT costs $2.00 per 1M input tokens and $12.00 per 1M output tokens. Cached reads cost $0.20 per 1M tokens.

Model Details
ID
google/gemini-3.1-pro-preview-customtools
Provider
NanoGPT
Family
Release Date
Feb 27, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
NANO_GPT_API_KEY
API Base URL
https://nano-gpt.com/api/v1
Documentation