Claude Opus 4.1 vs Claude Opus 4.5
Claude Opus 4.5 is cheaper on output tokens. Choose Claude Opus 4.1 or Claude Opus 4.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Opus 4.1 | Claude Opus 4.5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input / 1M tokens | $15.00 | $5.00 |
| Output / 1M tokens | $75.00 | $25.00 |
| Context window | 200K | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Aug 2025 | Nov 2025 |
| LMArena (Chatbot Arena) Elo score | 1419 | 1451 |
| GPQA Diamond score | 77.3 | 86.0 |
| FrontierMath score | 7.2 | 20.7 |
| LMArena WebDev Elo score | 1390 | 1494 |
| Epoch Capabilities Index score | 144 | 150 |
| LiveBench score | — | 76.0 |
| SWE-bench Multilingual score | — | 70.7 |
| SWE-bench Verified score | — | 79.2 |
FAQ
Is Claude Opus 4.1 or Claude Opus 4.5 cheaper?
Claude Opus 4.5 is cheaper on output tokens ($25.00 vs $75.00 per 1M).
Which has the larger context window, Claude Opus 4.1 or Claude Opus 4.5?
Both models offer a similar context window.
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.