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Google: Gemini 3.1 Pro Preview Custom Tools API Pricing

Google: Gemini 3.1 Pro Preview Custom Tools is an API model from google. It costs $2 per 1M input tokens and $12 per 1M output tokens, with cached input at $0.2. Its context window is 1,048,576 tokens with up to 65,536 output tokens. A workload of 10M input + 2M output tokens costs about $44 per month.
Input
$2
per 1M tokens
Output
$12
per 1M tokens
Cached input
$0.2
per 1M tokens
Context window
1.04858M
1,048,576 tokens
Blended (80/20)
$4
per 1M tokens

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...

How much does Google: Gemini 3.1 Pro Preview Custom Tools cost for a real workload?

At 10M input + 2M output tokens per month, Google: Gemini 3.1 Pro Preview Custom Tools costs about $44 ($20 input + $24 output). Try your own volumes in the cost calculator.

What are cheaper alternatives to Google: Gemini 3.1 Pro Preview Custom Tools?

Where to run Google: Gemini 3.1 Pro Preview Custom Tools

AI/ML API: one API key for 400+ models, including most models tracked here · Novita AI: pay-as-you-go APIs for open models (DeepSeek, Qwen, Llama and more) plus GPU cloud. Prices there follow each platform's own catalog and can differ from the list prices tracked here.

Run it on AI/ML API →Run it on Novita AI →

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Compare Google: Gemini 3.1 Pro Preview Custom Tools with other models

Google: Gemini 3.1 Pro Preview Custom Tools vs Google: Gemma 4 26B A4B (free)Google: Gemini 3.1 Pro Preview Custom Tools vs Google: Gemma 4 31B (free)Google: Gemini 3.1 Pro Preview Custom Tools vs Google: Lyria 3 Pro PreviewGoogle: Gemini 3.1 Pro Preview Custom Tools vs Google: Lyria 3 Clip PreviewGoogle: Gemini 3.1 Pro Preview Custom Tools vs Google: Gemma 3 4BGoogle: Gemini 3.1 Pro Preview Custom Tools vs Google: Gemma 3 12B

Frequently asked questions

How much does Google: Gemini 3.1 Pro Preview Custom Tools cost?

Google: Gemini 3.1 Pro Preview Custom Tools costs $2 per 1M input tokens and $12 per 1M output tokens (list price, snapshot October 22, 2026). At 10M input + 2M output tokens per month that is about $44.

What is the context window of Google: Gemini 3.1 Pro Preview Custom Tools?

Google: Gemini 3.1 Pro Preview Custom Tools has a context window of 1,048,576 tokens and can return up to 65,536 output tokens per response.

What are cheaper alternatives to Google: Gemini 3.1 Pro Preview Custom Tools?

Cheaper models include MoonshotAI: Kimi K3 (batch) ($2.28 in / $11.4 out), Xiaomi: MiMo-V2.6-Pro-UltraSpeed ($4.35 in / $8.7 out), OpenAI: GPT Audio ($2.5 in / $10 out). See the full list on this page.

Is Google: Gemini 3.1 Pro Preview Custom Tools free to use?

No. Google: Gemini 3.1 Pro Preview Custom Tools is a paid model at $2 input / $12 output per 1M tokens. 21 free models are listed on the free models page.

Provider: google · Model ID: google/gemini-3.1-pro-preview-customtools · Modality: text+image+file+audio+video->text · Price snapshot October 22, 2026, refreshed daily. How we collect prices