Google

Gemini 3.1 Pro Preview Custom Tools

CTX1.05M

Preview

87Quality

Reasoning · Vision · Tools

Input$2/M

Output$12/M

Advanced Gemini model for complex reasoning, coding, and multimodal analysis

PaidProprietary794/1044

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GoogleTextRarePreview

Gemini 3.1 Pro Preview Custom Tools

Advanced Gemini model for complex reasoning, coding, and multimodal analysis

gemini-3.1-pro-preview-customtools

Type: Text
Quality: 87 · Top 13% on the Epoch Capabilities Index
Context window: 1,048,576 tokens
Max output: 65,536 tokens
Input price: $2.00 / 1M tokens
Output price: $12.00 / 1M tokens
Cache read: $0.20 / 1M tokens
Cache write: —
Released: Feb 19, 2026
Knowledge cutoff: Jan 2025
Takes in: Text, Image, Audio, Video, PDF
Puts out: Text
Reasoning: Yes
Tool calling: Yes
Structured output: Yes
File attachments: Yes
Access: Paid
License: Proprietary
Rarity: Rare
Set number: 794/1044

Open Google docs Quality 87 Where to run it 13 Evolution 2/2 Meet its creature Battle GPT-5.6 Terra

Weights aren’t public. Use is governed by Google’s terms. Specs from models.dev, last changed Oct 19, 2026. Official source: ai.google.dev.

How good is it?

Public leaderboard scores for Gemini 3.1 Pro Preview Custom Tools, refreshed daily from Epoch AI and LMArena.

Top 13% of the 277 models on the Epoch Capabilities Index: #36.

Quality is the share of a leaderboard’s models this one beats, from 0 to 100. Chat models are rated on Epoch AI’s Capabilities Index when it lists them, otherwise on LMArena; image and video models on LMArena’s image and video arenas.

Leaderboards

Epoch Capabilities Index#36 of 277
One number fitted from dozens of hard benchmarks, from science questions to agentic coding.154.7 index
Listed as Gemini 3.1 Pro

Benchmarks Epoch AI runs

76%SWE-bench VerifiedFixing real issues in open-source Python projects

Scores from Epoch AI, licensed CC BY 4.0. Boards list models under their own names, so a close match is shown with the name it was scored under. Credits

Where to run it

13 providers sell Gemini 3.1 Pro Preview Custom Tools through an API. Prices are per million tokens, cheapest first.

CheapestAIHubMix$2.00 in · $12.00 out
From the labGoogle$2.00 in · $12.00 out

API providers

Provider	Input	Output	Context
AIHubMixCheapest paid`gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
Databricks`databricks-gemini-3-1-pro`	$2.00	$12.00	1.05M
Eden AI`google/gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
GoogleOfficial`gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
Kilo Gateway`google/gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
Merge Gateway`google/gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
NanoGPT`google/gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
Neon`gemini-3-1-pro`	$2.00	$12.00	1.05M
OpenRouter`google/gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
OrcaRouter`google/gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M

Show 3 more providers

Provider	Input	Output	Context
Tempr Gateway`google/gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
Vertex`gemini-3.1-pro-preview-customtools`	$2.00	$12.00	1.05M
AI/ML API`google/gemini-3.1-pro-preview-customtools`	$2.75	$16.50	1.05M

From models.dev and Hugging Face, checked daily. Resellers’ listings can lag behind their price pages, so confirm with the provider before you commit.

Face off

Current text models from other labs at a similar output price.