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Gemini 3.1 Pro (Preview Custom Tools)

Added Feb 27, 2026

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Use in the app

Gemini 3.1 Pro preview variant tuned for better tool selection behavior in coding agents and multi-tool workflows. It reduces overuse of generic bash tools and improves function-calling reliability while retaining Gemini 3.1 Pro's multimodal reasoning and 1M-token context. NOTE: Inputs > 200k tokens are charged at 2x input and 1.5x output rates.

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • Audio input
  • Video input
Input
Text, Images, Video, Audio
Output
Text
Reasoning effort
low · medium · high
Discovery tier
Frontier

Pricing

USD per 1M tokens
Input
$2.00
Output
$12.00
Cache read
$0.20
Cache write
$0.38

Reference prices as published by the model provider. API example

Specifications

Context window
1M
Max output
65.5K
Average output (7 days)
903 tokens
Longer than 68% of 465 models

Side by side

Gemini 3.1 Pro (Preview Custom Tools) compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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Gemini 3.1 Pro (Preview Custom Tools)GoogleThis modelMiniMax M3MiniMaxRemove
ProviderGoogleMiniMax
Discovery tierFrontierOpen weights
AddedFeb 27, 2026Jun 1, 2026
Limits
Context window1.05MBest512K
Max output65.54K80KBest
Average output903 tokens491 tokens
Pricing, USD per 1M tokens
Input$2.00$0.23Best
Output$12.00$0.96Best
Cache read$0.20$0.05Best
Cache write$0.38—
Performance
Throughput—87.7 tok/s
Time to first token—1.8 s
Request success (24h)—99.9%
Benchmark indexes
Intelligence Index29.7Best29.2
Coding Index68.8Best58.6
Capabilities
ReasoningYesNo
ToolsYesYes
VisionYesYes
Structured outputYesYes
Audio inputYesNo
Video inputYesNo
Reasoning effortlow, medium, high—

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • Gemini 3.1 Pro (Preview Custom Tools)
  • MiniMax M3

Intelligence Index

  • Gemini 3.1 Pro (Preview Custom Tools)29.7
  • MiniMax M329.2

Gemini 3.1 Pro (Preview Custom Tools): Better than 71% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • Gemini 3.1 Pro (Preview Custom Tools): 68.8Top
    • MiniMax M3: 58.6

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • Gemini 3.1 Pro (Preview Custom Tools): 35.4%Top
    • MiniMax M3: 21.3%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • Gemini 3.1 Pro (Preview Custom Tools): 9.4%Top
    • MiniMax M3: 4.4%

  • Harvey LAB-AAv1.1

    Legal tasks passed in full, with no material hallucination

    • Gemini 3.1 Pro (Preview Custom Tools): 0.0%Top
    • MiniMax M3: 0.0%Top

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • Gemini 3.1 Pro (Preview Custom Tools): 456 Elo
    • MiniMax M3: 1,089 EloTop

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • Gemini 3.1 Pro (Preview Custom Tools): 791 Elo
    • MiniMax M3: 1,243 EloTop

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • Gemini 3.1 Pro (Preview Custom Tools): 17.8%Top
    • MiniMax M3: 9.8%

  • AA-LCRv1.1

    Reasoning across long documents

    • Gemini 3.1 Pro (Preview Custom Tools): 82.0%
    • MiniMax M3: 83.0%Top

  • MLCR-AA

    Long-context reasoning over medical records

    • Gemini 3.1 Pro (Preview Custom Tools): 11.1%Top
    • MiniMax M3: 4.4%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Gemini 3.1 Pro (Preview Custom Tools): 47.0%Top
    • MiniMax M3: 39.0%

  • GPQA Diamond

    Graduate-level science questions

    • Gemini 3.1 Pro (Preview Custom Tools): 94.1%Top
    • MiniMax M3: 92.9%

  • IFBench

    Following precise output instructions

    • Gemini 3.1 Pro (Preview Custom Tools): 77.1%
    • MiniMax M3: 82.9%Top

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • Gemini 3.1 Pro (Preview Custom Tools): 4.0%Top
    • MiniMax M3: 2.0%

  • SciCode

    Scientific computing in Python

    • Gemini 3.1 Pro (Preview Custom Tools): 58.7%Top
    • MiniMax M3: 47.1%

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • Gemini 3.1 Pro (Preview Custom Tools): 53.8%Top
    • MiniMax M3: 42.4%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • Gemini 3.1 Pro (Preview Custom Tools): 95.6%Top
    • MiniMax M3: 88.9%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Gemini 3.1 Pro (Preview Custom Tools): 82.0%
    • MiniMax M3: 83.0%Top

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-3.1-pro-preview-customtools",
    "reasoning_effort": "medium",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="google/gemini-3.1-pro-preview-customtools",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

Google

Other Google models, starting with the same family.