Gemini 3.1 Pro Preview

GOOGLE Developer Architecture Profile

OpenRouter ↗HuggingFace ↗

Intelligence (ELO)1503Aider: 60.9%

Max Context Limit1,048,576Max Out: 65,536 tokens

Prompt Caching90% OFF$0.20 / 1M cached

Standard API / 1M$14.00🧠 Deep Reasoner

Model Capabilities & Contract SLAs

Fictional
Drafting
Classification
Conversational
Reasoning
Agentic
Coding & Logic
📋 Strict JSON Schema
🛠️ Native Tool Calling
🧠 Extended Test-Time Reasoning

Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation...

Granular Pricing Matrix

Input Tokens (Standard Prompt)$2.00 / 1M

⚡ Cached Input (Prompt Cache Read)90% OFF$0.20 / 1M

Output Tokens (Completion)$12.00 / 1M

Internal Reasoning Tokens$12.00 / 1M

Pricing data via OpenRouter. Sync: 10/2/2026

Evaluate Competitors

VS Engine MatchupGemini 3.1 Pro Preview vs OpenAI: GPT-5.6 Sol Pro VS Engine MatchupGemini 3.1 Pro Preview vs OpenAI: GPT-5 Image Mini VS Engine MatchupGemini 3.1 Pro Preview vs Anthropic: Claude Opus 5.5 (batch)VS Engine MatchupGemini 3.1 Pro Preview vs Google: Gemini 3.7 Flash (batch)VS Engine MatchupGemini 3.1 Pro Preview vs Anthropic: Claude Opus 5 VS Engine MatchupGemini 3.1 Pro Preview vs Google: Gemini 3.5 Flash Lite