Claude Opus 5 vs Gemini 3.1 Pro Preview
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Claude Opus 5 | Gemini 3.1 Pro Preview | |
|---|---|---|
| API model IDs | claude-opus-5 | gemini-3.1-pro-preview |
| Context window | 1,000,000 | 1,048,576 |
| Lifecycle | active | active |
| License | proprietary | proprietary |
| Trains on API data | No | No |
| Zero data retention | on-request | on-request |
| Input per 1M tokens | $5 (verified 2026-09-08) | $2 (verified 2026-09-08) |