Google

Gemini 3.1 Pro Preview Custom Tools

google/gemini-3.1-pro-preview-customtools

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Specification

Published by the vendor; the platform bills at the target's declared price.

Gemini 3.1 Pro Preview Custom Tools

reasoning tools

Google google/gemini-3.1-pro-preview-customtools

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...

Input $/1M: $2.00
Output $/1M: $12.0
Context: 1.0M
Max output: 66K
Released: Feb 25, 2026
Modalities: textaudioimagevideofile

Cached input reads $0.20 per 1M

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targets.yamlyaml

# targets.yaml - declare a target that runs Gemini 3.1 Pro Preview Custom Tools
targets:
  - id: gemini-3-1-pro-preview-customtools
    kind: llm
    name: Gemini 3.1 Pro Preview Custom Tools
    metadata:
      model: google/gemini-3.1-pro-preview-customtools          # links the target to this catalogue entry
    capabilities:
      domains: [general]
      supports_tools: true
      context_window: 1048576
    cost:
      usd_per_1k_tokens: 0.007000

Price among Google models

Input list price per million tokens; Gemini 3.1 Pro Preview Custom Tools is the 12th cheapest of 13 listed.

1
Gemini 3.5 Flash Lite (batch)
$0.15
2
Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image)
$0.25
3
Gemini 3.5 Flash Lite
$0.30
4
Gemini 3.8 Flash (batch)
$0.38
5
Gemini 3.7 Flash (batch)
$0.38
6
Gemini 3.6 Flash (batch)
$0.38
7
Nano Banana 2 (Gemini 3.1 Flash Image)
$0.50
8
Gemini 3.8 Flash
$0.75
9
Gemini 3.7 Flash
$0.75
10
Gemini 3.6 Flash
$0.75
11
Gemini 3.5 Flash
$1.50
12
Gemini 3.1 Pro Preview Custom Tools
$2.00

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