Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Model details →Anthropic: Claude Sonnet 4.5 vs Anthropic: Claude Opus Latest
Anthropic: Claude Sonnet 4.5 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
This model always redirects to the latest model in the Claude Opus family.
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Sonnet 4.5 | Anthropic: Claude Opus Latest | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1M | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $3.00 | $5.00 | 🏆 Anthropic: Claude Sonnet 4.5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $15.00 | $25.00 | 🏆 Anthropic: Claude Sonnet 4.5 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Sonnet 4.5 better than Anthropic: Claude Opus Latest?
Anthropic: Claude Sonnet 4.5 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Sonnet 4.5 and Anthropic: Claude Opus Latest?
Input: $3.00 vs $5.00 per 1M tokens. Output: $15.00 vs $25.00 per 1M tokens.
What context windows do Anthropic: Claude Sonnet 4.5 and Anthropic: Claude Opus Latest support?
Anthropic: Claude Sonnet 4.5 supports up to 1M tokens. Anthropic: Claude Opus Latest supports up to 1M tokens.
Do both Anthropic: Claude Sonnet 4.5 and Anthropic: Claude Opus Latest support tool calling?
Anthropic: Claude Sonnet 4.5: yes. Anthropic: Claude Opus Latest: yes.
Compare Anthropic: Claude Sonnet 4.5 with other models
vs Anthropic Claude Haiku Latestvs Anthropic Claude Sonnet Latestvs Anthropic: Claude Fable Latestvs Anthropic: Claude Opus Latest