Gemini 3.1 Pro
Google's flagship multimodal model with a 1M-token context window.
Gemini 3.1 Pro specifications
| Provider | |
|---|---|
| Context window | 1,000,000 tokens (1.0M) |
| Input price | $2.00 / 1M tokens |
| Output price | $12.00 / 1M tokens |
| Inputs | Text, Images, Audio, Video |
| Reasoning mode | Yes |
| Vision (image input) | Yes |
| Tool / function calling | Yes |
| Native real-time web | No |
| Open-weight | No |
| Released | February 2026 |
Pricing & context web-verified June 2026 — confirm on Google's pricing page. Prompts over 200K input tokens bill at a higher tier ($4 / $18 per 1M).
What Gemini 3.1 Pro is best for
- Very long documents and multi-file analysis
- Multimodal (image / audio / video) tasks
- Agentic workflows and complex reasoning
How to prompt Gemini 3.1 Pro
- Lean on the 1M context — paste whole documents or repos rather than chunking them.
- Above ~200K-token prompts, a higher price tier applies.
- It natively accepts audio and video; tell it exactly what to extract.
Work with Gemini 3.1 Pro
- Build an optimized prompt with the Google prompt generator.
- Estimate cost with the token counter & cost calculator, or compare every model on the AI model comparison page.
- Related reading: Best Gemini Prompts 2026 · Gemini Prompting Guide.
- Official: gemini.google.com
Frequently asked questions
What is Gemini 3.1 Pro's context window?
Gemini 3.1 Pro has a 1,000,000-token context window (about 1.0M tokens) — the maximum amount of text it can consider at once.
How much does Gemini 3.1 Pro cost?
Via the Google API, Gemini 3.1 Pro costs $2.00 per 1M input tokens and $12.00 per 1M output tokens (web-verified June 2026). Output tokens cost more, so the length of the model's reply usually drives the bill.
Is Gemini 3.1 Pro multimodal?
Yes — Gemini 3.1 Pro accepts Text, Images, Audio, Video as input, not just text.
Is Gemini 3.1 Pro open-weight?
No — Gemini 3.1 Pro is available only through the Google API, not as downloadable weights.