Claude Sonnet 3.5 vs Claude Sonnet 4
Both have similar output pricing. Choose Claude Sonnet 3.5 or Claude Sonnet 4 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 3.5 | Claude Sonnet 4 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input / 1M tokens | $3.00 | $3.00 |
| Output / 1M tokens | $15.00 | $15.00 |
| Context window | 200K | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Jun 2024 | May 2025 |
| SWE-bench Multimodal score | 12.2 | — |
| Aider Polyglot score | — | 61.3 |
| SWE-bench Verified score | — | 76.8 |
| GPQA Diamond score | — | 78.3 |
| FrontierMath score | — | 4.1 |
| Epoch Capabilities Index score | — | 142 |
| LMArena (Chatbot Arena) Elo score | — | 1351 |
| LMArena Vision Elo score | — | 1191 |
FAQ
Is Claude Sonnet 3.5 or Claude Sonnet 4 cheaper?
Claude Sonnet 3.5 and Claude Sonnet 4 have comparable output pricing.
Which has the larger context window, Claude Sonnet 3.5 or Claude Sonnet 4?
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.