What is Gemini 3.1 Pro Preview Custom Tools?

Gemini 3.1 Pro Preview Custom Tools is an AI model by Google.

How much does Gemini 3.1 Pro Preview Custom Tools cost on Zeplik?

Input tokens cost 24.0 credits per million and output tokens 144 credits per million (1 credit = $0.10; the raw provider rates are $2.00 and $12.00 per million). New accounts start with free credits.

How long can a conversation with Gemini 3.1 Pro Preview Custom Tools be?

Gemini 3.1 Pro Preview Custom Tools has a 1.0M-token context window (1,048,576 tokens), which covers the conversation plus any documents you attach.

Does Gemini 3.1 Pro Preview Custom Tools support images and tools?

Gemini 3.1 Pro Preview Custom Tools accepts image input and supports tool calling.

Gemini 3.1 Pro Preview Custom Tools

Fast and lightVisionTools

Google · Released February 2026

It is part of Google's Gemini and Gemma catalog: Pro tiers lead on capability, Flash tiers on speed and price, Nano Banana covers image generation, and Gemma models are open weight.

Facts and pricing

Provider: Google
Context window: 1.0M tokens
Input price: 24.0 credits / 1M tokens ($2.00 raw)
Output price: 144 credits / 1M tokens ($12.00 raw)
Vision (image input): Yes
Tool calling: Yes
Extended reasoning: No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.

What Gemini 3.1 Pro Preview Custom Tools is best for

High-volume everyday tasks where speed and cost matter: summaries, drafts, quick questions
Very long documents and codebases: a 1.0M-token window fits entire books or repositories in one conversation
Working with images: screenshots, charts, photos and scanned documents alongside text
Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a fast and light model like Gemini 3.1 Pro Preview Custom Tools:

Summarize this article in five bullet points
Rewrite this email to be shorter and friendlier
Give me ten name ideas for a hiking newsletter
Translate this paragraph to Spanish and keep the tone

Google family

Model	Context	Input cr/M	Output cr/M	Released
Gemini 4 Argon	1.0M	24.0	120	October 2026
Nano Banana 2.1	66K	18.0	90.0	October 2026
Gemini 3.8 Flash	1.0M	9.0	45.0	September 2026
Gemini 3.8 Flash (batch)	1.0M	4.5	22.5	September 2026
Gemini 3.7 Flash (batch)	1.0M	4.5	22.5	August 2026
Gemini 3.7 Flash	1.0M	9.0	45.0	August 2026
Gemini 3.6 Flash (batch)	1.0M	4.5	22.5	July 2026
Gemini 3.6 Flash	1.0M	9.0	45.0	July 2026
Gemini 3.5 Flash Lite (batch)	1.0M	1.8	15.0	July 2026
Gemini 3.5 Flash Lite	1.0M	3.6	30.0	July 2026

All 40 Google models

Model comparisons

Frequently asked questions

What is Gemini 3.1 Pro Preview Custom Tools?: Gemini 3.1 Pro Preview Custom Tools is an AI model by Google.
How much does Gemini 3.1 Pro Preview Custom Tools cost on Zeplik?: Input tokens cost 24.0 credits per million and output tokens 144 credits per million (1 credit = $0.10; the raw provider rates are $2.00 and $12.00 per million). New accounts start with free credits.
How long can a conversation with Gemini 3.1 Pro Preview Custom Tools be?: Gemini 3.1 Pro Preview Custom Tools has a 1.0M-token context window (1,048,576 tokens), which covers the conversation plus any documents you attach.
Does Gemini 3.1 Pro Preview Custom Tools support images and tools?: Gemini 3.1 Pro Preview Custom Tools accepts image input and supports tool calling.

Related models

Gemini 4 ArgonFast and light

Gemini 4 Argon is Google's flagship reasoning model, built for complex software engineering, deep mathematical and scientific problem solving, and autonomous multi-step agents.

1.0M ctx120 cr/M outOctober 2026

Nano Banana 2.1Fast and light

Nano Banana 2.1 (Gemini Nano Banana 2.1) is Google's image generation and editing model on the Flash tier, succeeding Nano Banana 2 and Nano Banana Pro.

66K ctx90.0 cr/M outOctober 2026

Gemini 3.8 FlashFast and light

Gemini 3.8 Flash is Google's most intelligent Flash model with significant gains from 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.

1.0M ctx45.0 cr/M outSeptember 2026

Gemini 3.8 Flash (batch)Fast and light

Gemini 3.8 Flash is Google's most intelligent Flash model with significant gains from 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.

1.0M ctx22.5 cr/M outSeptember 2026

Gemini 3.7 Flash (batch)Fast and light

Gemini 3.7 Flash is a multimodal model from Google for fast agentic workflows, coding, and complex multi-step reasoning.

1.0M ctx22.5 cr/M outAugust 2026

Gemini 3.7 FlashFast and light

Gemini 3.7 Flash is a multimodal model from Google for fast agentic workflows, coding, and complex multi-step reasoning.

1.0M ctx45.0 cr/M outAugust 2026