Claude Sonnet 5.5 vs Claude Sonnet 4.5
Claude Sonnet 5.5 is cheaper on output tokens, while Claude Sonnet 5.5 offers a larger context window. Choose Claude Sonnet 5.5 or Claude Sonnet 4.5 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 5.5 | Claude Sonnet 4.5 |
|---|---|---|
| Provider | Vertex (Anthropic) | Vertex (Anthropic) |
| Input / 1M tokens | $2.00 | $3.00 |
| Output / 1M tokens | $10.00 | $15.00 |
| Context window | 1M | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Sep 2026 | Sep 2025 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.