Gemini 3.1 Pro (Preview Custom Tools) API
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
textimageaudio
Output Modalities
text
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
Write
$0.38
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. Cache writes cost $0.38 per 1M tokens.
Model Details
ID
google/gemini-3.1-pro-preview-customtools
Provider
NanoGPTFamily
gemini-pro
Release Date
Feb 19, 2026
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
NANO_GPT_API_KEY
API Base URL
https://nano-gpt.com/api/v1