Gemini 3.1 Pro Preview vs Gemini 2.5 Pro
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Gemini 3.1 Pro Preview | Gemini 2.5 Pro | |
|---|---|---|
| API model IDs | gemini-3.1-pro-preview | gemini-2.5-pro |
| Context window | 1,048,576 | 1,048,576 |
| Lifecycle | active | legacy |
| License | proprietary | proprietary |
| Trains on API data | No | No |
| Zero data retention | on-request | on-request |
| Input per 1M tokens | $2 (verified 2026-09-08) | $1.25 (verified 2026-09-08) |