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Google: Gemini 3.1 Pro Preview

Explore Google’s multimodal reasoning model, its API costs, and alternatives you can use in Julius.

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Read the official research

Gemini 3.1 Pro Preview is not currently available in the Julius model menu.

Reviewed October 13, 2026 · Sources

Research report showing conversion falling for both visitor segments despite a higher overall rate caused by a changing visitor mix. — Conversion analysis reportIllustrative output · Fictional dataView full size

Best suited to: Researching multimodal reasoning capabilities
Published context: 1,048,576 input tokens
Native inputs: Text, images, video, audio, and PDFs
Output: Text; up to 65,536 tokens

Gemini 3.1 Pro Preview pricing

Compare the provider’s API rates with access through Julius.

Google API

Input / 1M tokens: $2
Output / 1M tokens: $12

Standard API rates per million tokens for prompts up to 200K tokens. Above 200K, input is $4 and output is $18 per million. Output pricing includes thinking tokens; caching and grounding can add charges.

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Supported alternatives on Julius

Compare the supported alternatives below to find a model for analysis, research, and creating deliverables.

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Prices in USD, reviewed October 13, 2026. API token charges are separate from Julius subscriptions and credits.

What is Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview is Google’s multimodal reasoning model. It accepts text, images, video, audio, and PDFs, with a 1,048,576-token input limit and text output.

Gemini 3.1 Pro is relevant when comparing models that can interpret several kinds of media. This page documents the Preview model and its provider API. To work in Julius today, choose one of the supported alternatives below.

Multiple input formats

The provider API accepts text, image, video, audio, and PDF inputs in supported requests.

Reasoning with tools

Google documents thinking, function calling, structured outputs, and code execution for this model.

Choose an alternative for your work

Gemini 3.1 Pro Preview is not currently available in the Julius model menu. The alternatives below link to models you can use for your task on eligible Julius plans.

Model details and official research

Go to the original documentation for specifications, release details, and evaluation methods.

Gemini 3.1 Pro Preview model documentation

Google’s input formats, token limits, and supported features.

Gemini API pricing

Standard and long-context rates, caching, and grounding costs.

Gemini 3.1 Pro Preview: frequently asked questions

Is Gemini 3.1 Pro Preview available on Julius?

Gemini 3.1 Pro Preview is not currently available in the Julius model menu.

How much does Gemini 3.1 Pro Preview cost?

Google lists $2 per million input tokens and $12 per million output tokens. Standard API rates per million tokens for prompts up to 200K tokens. Above 200K, input is $4 and output is $18 per million. Output pricing includes thinking tokens; caching and grounding can add charges. Julius subscriptions and credits are separate.

Can I try Gemini 3.1 Pro on Julius?

Gemini 3.1 Pro Preview is not currently in Julius’s model menu. For analysis and research in Julius, compare supported options such as GPT-6 Astra, Muse Wonder, and Claude Opus 5.5.