Model Watch · Google
Gemini 3.1 Pro Preview
The only Pro-tier Gemini you can call, and Google still labels it preview seven months in. Prompts over 200K tokens bill at double.
What is Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview is a model from Google, built in the US. You can call it, but the lab still calls it a preview, so expect the behavior to move.
When did Gemini 3.1 Pro Preview come out?
Google released it on 19 February 2026. That date comes from the lab's own docs.
What does it cost, and how much context does it hold?
| Lab | |
|---|---|
| Built in | US |
| Status | preview |
| API model id | gemini-3.1-pro-preview |
| Released | 19 February 2026 |
| Context window | 1,048,576 tokens |
| Max output | 65,536 tokens |
| Input, per 1M tokens | $2.00 |
| Output, per 1M tokens | $12.00 |
List prices per million tokens, read off the lab's own docs. Caching, batching and volume deals all cut the real number, so treat this as the ceiling. Check the source before you budget against it.
At 700 words in and 500 out, twenty times a day, that works out around $5.92 a month. Put your own numbers in, see every Google price, or put it next to another model.
How does it compare to Google's other models?
| Model | Status | Date | Context | In / 1M | Out / 1M |
|---|---|---|---|---|---|
| Gemini 3.1 Pro Preview | preview | 19 February 2026 | 1,048,576 tokens | $2.00 | $12.00 |
| Gemini 3.8 Flash | released | 2 September 2026 | 1,048,576 tokens | $0.75 | $3.75 |
| Gemini 3.7 Flash | released | 13 August 2026 | 1,048,576 tokens | $0.75 | $3.75 |
| Gemini 3.6 Flash | released | 21 July 2026 | 1,048,576 tokens | $0.75 | $3.75 |
| Gemini 3.5 Flash-Lite | released | 21 July 2026 | 1,048,576 tokens | $0.30 | $2.50 |
| Gemini 3.5 Flash | released | 19 May 2026 | 1,048,576 tokens | $1.50 | $9.00 |
| Gemini 3.1 Flash-Lite | released | 7 May 2026 | 1,048,576 tokens | $0.25 | $1.50 |
| Gemini 3 Flash Preview | preview | 17 December 2025 | 1,048,576 tokens | $0.50 | $3.00 |
| Gemini 3.5 Pro | announced | — | — | — | — |
| Gemini 3.1 Deep Think | released | — | — | — | — |
| Gemini 2.5 Pro | released | — | 1,048,576 tokens | $1.25 | $10.00 |
A dash means the lab hasn't published that number for that model.
Every mention we've logged
Every tracked post, release, changelog entry or incident whose title or summary names Gemini 3.1 Pro Preview. Newest first, each one linking to where the lab published it.
Nothing yet. The name hasn't appeared in a tracked source.
Gemini 3.1 Pro Preview is part of the Gemini 3 family, which is where the point releases sit next to each other.
Keep reading
The release timeline is every model we know about, filterable by lab, country and date. The tracker is the live feed these mentions come from, and Model Watch is the whole catalogue on one page.
More from Google:
- Gemini 3.8 Flash · released
- Gemini 3.7 Flash · released
- Gemini 3.6 Flash · released
- Gemini 3.5 Flash-Lite · released
- Gemini 3.5 Flash · released
- Gemini 3.1 Flash-Lite · released
- Gemini 3 Flash Preview · preview
- Gemini 3.5 Pro · announced
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