Claude Sonnet 4.5 vs Claude 3.5 Sonnet
Both have similar output pricing, while Claude Sonnet 4.5 offers a larger context window. Choose Claude Sonnet 4.5 or Claude 3.5 Sonnet based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 4.5 | Claude 3.5 Sonnet |
|---|---|---|
| Provider | Anthropic | DigitalOcean |
| Input / 1M tokens | $3.00 | $3.00 |
| Output / 1M tokens | $15.00 | $15.00 |
| Context window | 1M | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Sep 2025 | Jun 2024 |
| LiveBench score | 67.9 | — |
| SWE-bench Multilingual score | 67.0 | — |
| FrontierMath score | 15.2 | 2.1 |
| Epoch Capabilities Index score | 147 | 133 |
| SWE-bench Verified score | 74.8 | 63.4 |
| LMArena (Chatbot Arena) Elo score | 1439 | 1298 |
| GPQA Diamond score | 82.3 | 55.3 |
| LMArena WebDev Elo score | 1394 | — |
| Aider Polyglot score | — | 51.6 |
| SWE-bench Multimodal score | — | 25.3 |
| LMArena Vision Elo score | — | 1126 |
FAQ
Is Claude Sonnet 4.5 or Claude 3.5 Sonnet cheaper?
Claude Sonnet 4.5 and Claude 3.5 Sonnet have comparable output pricing.
Which has the larger context window, Claude Sonnet 4.5 or Claude 3.5 Sonnet?
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.