Claude Opus 4.1 vs Claude 4 Opus
Claude Opus 4.1 is cheaper on output tokens. Choose Claude Opus 4.1 or Claude 4 Opus based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Opus 4.1 | Claude 4 Opus |
|---|---|---|
| Provider | Anthropic | NanoGPT |
| Input / 1M tokens | $15.00 | $14.99 |
| Output / 1M tokens | $75.00 | $75.00 |
| Context window | 200K | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Aug 2025 | May 2025 |
| LMArena (Chatbot Arena) Elo score | 1419 | — |
| LMArena WebDev Elo score | 1390 | — |
| GPQA Diamond score | 77.3 | — |
| FrontierMath score | 7.2 | — |
| Epoch Capabilities Index score | 144 | — |
| SWE-bench Verified score | — | 73.2 |
FAQ
Is Claude Opus 4.1 or Claude 4 Opus cheaper?
Claude Opus 4.1 is cheaper on output tokens ($75.00 vs $75.00 per 1M).
Which has the larger context window, Claude Opus 4.1 or Claude 4 Opus?
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.