Claude Opus 4.5 vs Claude Opus 5
Both have similar output pricing, while Claude Opus 5 offers a larger context window. Choose Claude Opus 4.5 or Claude Opus 5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Opus 4.5 | Claude Opus 5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input / 1M tokens | $5.00 | $5.00 |
| Output / 1M tokens | $25.00 | $25.00 |
| Context window | 200K | 1M |
| Parameters | — | — |
| Open weights | No | — |
| Released | Nov 2025 | — |
| LiveBench score | 76.0 | — |
| SWE-bench Verified score | 79.2 | — |
| SWE-bench Multilingual score | 70.7 | — |
| LMArena (Chatbot Arena) Elo score | 1451 | 1507 |
| LMArena WebDev Elo score | 1493 | 1690 |
| GPQA Diamond score | 86.0 | 93.9 |
| FrontierMath score | 20.7 | — |
| Epoch Capabilities Index score | 150 | 163 |
| LMArena Vision Elo score | — | 1319 |
FAQ
Is Claude Opus 4.5 or Claude Opus 5 cheaper?
Claude Opus 4.5 and Claude Opus 5 have comparable output pricing.
Which has the larger context window, Claude Opus 4.5 or Claude Opus 5?
Claude Opus 5 has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.