Gemini 3.1 Pro: Google's Latest Flagship

Gemini 3.1 Pro is Google's newest flagship model, 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 pack - cheaper than GPT-5.4 ($2.50/$15) and Claude Sonnet 4.6 ($3/$15).

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, image generation, reasoning mode, and PDF analysis. 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-5.4 has code interpreter
• For Canvas editing: GPT-5.4 or Claude Sonnet 4.6 support it
• For best writing: Claude Opus 4.6 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 all models on Magicdoor, it automatically uses 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.