Gemini 3.1 Pro Preview Custom Tools

GOOGLE Developer Architecture Profile

OpenRouter ↗HuggingFace ↗

Intelligence (ELO)1493Chatbot Arena Verified

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

Prompt Caching90% OFF$0.20 / 1M cached

Standard API / 1M$14.00Blended Standard Rate

Model Capabilities & Contract SLAs

Fictional
Drafting
Classification
Conversational
Agentic
Top Tier
Coding & Logic
📋 Strict JSON Schema
🛠️ Native Tool Calling

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...

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 Custom Tools vs Google: Gemini 3.5 Flash VS Engine MatchupGemini 3.1 Pro Preview Custom Tools vs Google: Gemini 3.5 Flash (batch)VS Engine MatchupGemini 3.1 Pro Preview Custom Tools vs Google: Gemini 3.1 Flash Lite VS Engine MatchupGemini 3.1 Pro Preview Custom Tools vs Google: Nano Banana 2 (Gemini 3.1 Flash Image Preview)VS Engine MatchupGemini 3.1 Pro Preview Custom Tools vs OpenAI: GPT-4.1 Mini VS Engine MatchupGemini 3.1 Pro Preview Custom Tools vs Qwen: Qwen3.8 Max Prime