Google

Gemini 3.1 Pro Preview

CTX1.05M

Preview

87Quality

Reasoning · Vision · Tools

Input$2/M

Output$12/M

Reasoning-first Gemini preview for agentic coding and complex problem solving

PaidProprietary793/1040

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GoogleTextRarePreview

Gemini 3.1 Pro Preview

Reasoning-first Gemini preview for agentic coding and complex problem solving

gemini-3.1-pro-preview

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: 793/1040

Open Google docs Quality 87 Where to run it 35 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 18, 2026. Official source: ai.google.dev.

How good is it?

Public leaderboard scores for Gemini 3.1 Pro Preview, 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
LMArena Text#19 of 416
People compare two anonymous answers and vote for the better one.1,480 rating
LMArena Text · Coding#49 of 411
The text arena’s coding prompts only.1,484 rating
LMArena Text · Math#27 of 400
The text arena’s math prompts only.1,485 rating
LMArena Text · Creative writing#14 of 414
The text arena’s creative writing prompts only.1,482 rating
LMArena WebDev#73 of 144
Each model builds a web app from the same prompt; people pick the better one.1,447 rating
LMArena Vision#22 of 165
Questions about images, voted by people.1,296 rating

Benchmarks Epoch AI runs

Scores from Epoch AI and LMArena, 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

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

CheapestKilo Gateway$1.00 in · $6.00 out
Free to try1 providerKenari
From the labGoogle$2.00 in · $12.00 out

API providers

Provider	Input	Output	Context
KenariFree`gemini-3-1-pro`	Free	Free	1.05M
Kilo GatewayCheapest paid`google/gemini-3.1-pro-preview`	$1.00	$6.00	1.05M
302.AI`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Abacus`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
AIHubMix`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Auriko`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
CrossModel`gemini/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
DaoXE`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
DevPass (LLM Gateway)`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Eden AI`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M

Show 25 more providers

Provider	Input	Output	Context
FastRouter`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
FrogBot`gemini-3-1-pro-preview`	$2.00	$12.00	1M
GoogleOfficial`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Impossibl`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
LLM Gateway`quartz/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Merge Gateway`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
NanoGPT`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Ofox`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
OpenCode`gemini-3.1-pro`	$2.00	$12.00	1.05M
OpenRouter`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Opper`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
OrcaRouter`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Perplexity Agent`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Pioneer`gemini-3.1-pro`	$2.00	$12.00	1M
Prime Inference`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Requesty`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Standard Compute`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Tempr Gateway`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Vercel AI Gateway`google/gemini-3.1-pro-preview`	$2.00	$12.00	1M
Vertex`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Vivgrid`gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
ZenMux`google/gemini-3.1-pro-preview`	$2.00	$12.00	1.05M
Venice AI`gemini-3-1-pro-preview`	$2.50	$15.00	1M
AI/ML API`google/gemini-3.1-pro-preview`	$2.60	$15.60	1M
Snowflake Cortex`gemini-3.1-pro`	—	—	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.