Claude Opus 4.5 vs Claude Sonnet 4.5
Claude Sonnet 4.5 is cheaper on output tokens, while Claude Sonnet 4.5 offers a larger context window. Choose Claude Opus 4.5 or Claude Sonnet 4.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Opus 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input / 1M tokens | $5.00 | $3.00 |
| Output / 1M tokens | $25.00 | $15.00 |
| Context window | 200K | 1M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Nov 2025 | Sep 2025 |
| LiveBench score | 76.0 | 67.9 |
| LMArena (Chatbot Arena) Elo score | 1451 | 1438 |
| GPQA Diamond score | 86.0 | 82.3 |
| FrontierMath score | 20.7 | 15.2 |
| LMArena WebDev Elo score | 1494 | 1394 |
| Epoch Capabilities Index score | 150 | 147 |
| SWE-bench Multilingual score | 70.7 | 67.0 |
| SWE-bench Verified score | 79.2 | 74.8 |
FAQ
Is Claude Opus 4.5 or Claude Sonnet 4.5 cheaper?
Claude Sonnet 4.5 is cheaper on output tokens ($15.00 vs $25.00 per 1M).
Which has the larger context window, Claude Opus 4.5 or Claude Sonnet 4.5?
Claude Sonnet 4.5 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.