Claude Opus 4.8 vs Claude Opus 4.5
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Claude Opus 4.8 | Claude Opus 4.5 | |
|---|---|---|
| API model IDs | claude-opus-4-8 | claude-opus-4-5-20251101, claude-opus-4-5 |
| Context window | 1,000,000 | 200,000 |
| Lifecycle | legacy | legacy |
| 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) | $5 (verified 2026-09-08) |