Models/Google/Gemini 3.1 Pro Preview Custom Tools

Gemini 3.1 Pro Preview Custom Tools

Name: Gemini 3.1 Pro Preview Custom Tools API access
Brand: Google

Google · Proprietary · Released Feb 25, 2026 · google/gemini-3.1-pro-preview-customtools

Best $2.00 in / $12.00 out via Google AI Studio

Compare Estimate cost

1.05M contextVisionToolsReasoningStructured outputPrompt cachingAudio input

Available from 1 providerUSD / MTOK · PRICES 23 MINUTES AGO · SPEED 11 DAYS AGO

EST. MONTHLY COSTclick a row for detail · click headers to sort

PROVIDER	INPUT	OUTPUT	CACHE	CONTEXT	QUANT	TTFT	TPS	UPTIME
Google AI Studio	$2.00	$12.00	$0.20	1.05M	—	2.8s	340 tok/s	100.0%

TTFT/TPS: median (P50) over trailing 504h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · methodology v1.1 · measured 11 days ago

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Pricing variants · USD / MTok in / out

STANDARD

$2.00 / $12.00

per MTok in / out

CACHE READ $0.20CACHE WRITE $0.375WEB SEARCH $0.014 / search

About

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...

Specifications

Context window1,048,576

Max output65,536

Modalities intext, audio, image, video, file

Modalities outtext

LicenseProprietary

ReleasedFeb 25, 2026

TokenizerGemini

Nano Banana 2.1$1.50 / $7.50 Gemini 3.8 Flash$0.75 / $3.75 Gemini 3.7 Flash$0.75 / $3.75 Gemini 3.6 Flash$0.75 / $3.75

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Gemini 3.1 Pro Preview Custom Tools price and speed badge

[![Gemini 3.1 Pro Preview Custom Tools](https://modelindex.ai/badge/google/gemini-3.1-pro-preview-customtools)](https://modelindex.ai/models/google/gemini-3.1-pro-preview-customtools)

Sources

OpenRouter API23 minutes ago

AGGREGATOR

LiteLLM dataset23 minutes ago

AGGREGATOR

ModelIndex benchmarks11 days ago

MEASURED

Verified 23 minutes ago · list prices, not negotiated rates.