Google: Gemini 3.1 Pro Preview Custom Tools

Public pricingIntelligence 83/100Huge memoryVisionDeep thinkingTool use

Google: Gemini 3.1 Pro Preview Custom Tools is a audio model for agent workflows and tool use. It combines multimodal input handling and reliable tool use and agent behavior with a 1M+ tokens context window and a balanced-cost profile. Use it for audio understanding and multimodal input when latency, cost, and throughput matters.

Input

$2.00/1M

Output

$12.00/1M

Cached

$0.20/1M

Batch

$1.00/1M

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Technical specifications

Gemini 3.1 Pro Preview Custom Tools at a glance.

Memory

1,048,576

tokens

Max reply

65,536

tokens

Memory tier

Huge

multiple books or whole repositories

Tokenizer

sentencepiece

Released

Mar 2026

Training cutoff

Apr 2025

Availability

Public pricing

Status

active

Benchmarks

Quality benchmarks

Independent evaluations from public leaderboards. Higher is better.

  • frontiermath_tier_4

    16.7

  • gpqa_diamond

    94.1

  • humanitys_last_exam

    46.44

  • swe_bench_verified

    75.62

What it can do

Capabilities & limits.

  • Understands images
  • Deep step-by-step thinking
  • Uses tools / calls functions
  • Strict JSON output
  • Streams replies
  • Fine-tunable on your data

When to pick Gemini 3.1 Pro Preview Custom Tools

  • Multi-step reasoning, research agents, or hard math.
  • Screenshot analysis, image understanding, or document OCR.
  • Agentic workflows that call tools or APIs.
  • Long documents, full codebases, or extensive chat histories.

When to look elsewhere

  • Very latency-sensitive, real-time apps where every millisecond counts.

Alternatives

Similar models to compare.

FAQ

Gemini 3.1 Pro Preview Custom Tools — the questions we see most.

Pricing, capabilities, alternatives — generated from the same data that powers the calculator above.

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At a typical workload of 50,000 conversations a month with 1,500-token prompts and 800-token replies, Gemini 3.1 Pro Preview Custom Tools costs roughly $630 per month. Input is $2.00 /1M tokens and output is $12.00 /1M tokens.
Gemini 3.1 Pro Preview Custom Tools has a 1,048,576-token context window (huge memory — multiple books or whole repositories). That means you can fit about 196,608 words of input and history in a single call.
Beyond text generation, Gemini 3.1 Pro Preview Custom Tools supports understanding images, deep step-by-step reasoning, calling functions / tools, strict JSON output, fine-tuning on your own data. It streams replies by default.
Gemini 3.1 Pro Preview Custom Tools was released in March 2026, with training data cut off around April 2025.
Models in a similar class include Gemini 3.1 Pro Preview, Gemini 2.5 Pro, Gemini 2.5 Pro Preview 05-06. The "Similar models" section below this FAQ links into each.

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