Strong coding and instruction-following for agents.
Model details →Claude 3.7 Sonnet vs Claude Sonnet 4.5
Claude Sonnet 4.5 wins on 1 of 6 axes — pricing and capability skew in its favour for most workloads.
Prior Sonnet generation; see Anthropic deprecations for migration timelines.
Model details →Side-by-side comparison
| Capability | Claude 3.7 Sonnet | Claude Sonnet 4.5 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 200K | 200K | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | Custom | Custom | — |
| Output price (per 1M) Cost per million output tokens billed by the provider. | Custom | Custom | — |
| Tool / function calling First-class support for emitting structured tool calls. | — | — | Tie |
| Vision input Accepts image inputs alongside text. | — | Yes | 🏆 Claude Sonnet 4.5 |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | — | — | Tie |
Frequently asked questions
Is Claude 3.7 Sonnet better than Claude Sonnet 4.5?
Claude Sonnet 4.5 wins on 1 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Claude 3.7 Sonnet and Claude Sonnet 4.5?
Input: Custom vs Custom per 1M tokens. Output: Custom vs Custom per 1M tokens.
What context windows do Claude 3.7 Sonnet and Claude Sonnet 4.5 support?
Claude 3.7 Sonnet supports up to 200K tokens. Claude Sonnet 4.5 supports up to 200K tokens.
Do both Claude 3.7 Sonnet and Claude Sonnet 4.5 support tool calling?
Claude 3.7 Sonnet: not advertised. Claude Sonnet 4.5: not advertised.