Gemini 3.1 Pro Overview

Gemini 3.1 Pro: Google's Pro Model

Gemini 3.1 Pro is Google's Pro model on Magicdoor, and its headline feature is a 1 million token context window - by far the largest among the major models on Magicdoor.

Pricing

• Prompt tokens: $2.00 per million
• Completion tokens: $12.00 per million

This puts it in the middle of the current chat lineup - more expensive than Gemini 3 Flash, equal to Grok 4.5 and Claude Sonnet 5 ($2/$10) on standard input cost, and below GPT-5.5 ($5/$30). Grok costs $2/$6 below 200K prompt tokens and $4/$12 at 200K or more.

What It's Good For

The massive context window is the main draw. If you need to:

• Analyze an entire codebase at once
• Process multiple long documents together
• Maintain context across a very long conversation

...Gemini 3.1 Pro can handle it where other models would need you to trim things down.

It supports vision, web search, reasoning mode, and PDF analysis. For image requests, Magicdoor routes to supported image models in the image lineup. The main gaps compared to other flagships: no Canvas support and no code interpreter.

When to Use Gemini 3.1 Pro

Use Gemini 3.1 Pro when you're working with lots of text:

• Research projects requiring multiple source documents
• Code review across large projects
• Long-form analysis where context matters

When to Use Something Else

• For code execution: GPT-5.5 has code interpreter
• For Canvas editing: GPT-5.5 or Claude Sonnet 5 support it
• For polished writing: Claude Opus 5 excels at polished prose
• For cost savings: Gemini 3 Flash is dramatically cheaper and still capable

Getting Started

Select Gemini 3.1 Pro from the model dropdown. Like the chat models on Magicdoor, it can automatically use web search when current information would help.

The context window is genuinely useful - don't be shy about uploading large files or pasting extensive content. That's where Gemini 3.1 Pro shines.