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 DeepSeek: R1 0528
Anthropic: Claude Sonnet 4.5 and DeepSeek: R1 0528 are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
May 28th update to the [original DeepSeek R1](/deepseek/deepseek-r1) Performance on par with [OpenAI o1](/openai/o1), but open-sourced and with fully open reasoning tokens. It's 671B parameters in size, with 37B active...
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Sonnet 4.5 | DeepSeek: R1 0528 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 164K | 🏆 Anthropic: Claude Sonnet 4.5 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $3.00 | $0.50 | 🏆 DeepSeek: R1 0528 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $15.00 | $2.15 | 🏆 DeepSeek: R1 0528 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 Anthropic: Claude Sonnet 4.5 |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Sonnet 4.5 better than DeepSeek: R1 0528?
Anthropic: Claude Sonnet 4.5 and DeepSeek: R1 0528 are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between Anthropic: Claude Sonnet 4.5 and DeepSeek: R1 0528?
Input: $3.00 vs $0.50 per 1M tokens. Output: $15.00 vs $2.15 per 1M tokens.
What context windows do Anthropic: Claude Sonnet 4.5 and DeepSeek: R1 0528 support?
Anthropic: Claude Sonnet 4.5 supports up to 1M tokens. DeepSeek: R1 0528 supports up to 164K tokens.
Do both Anthropic: Claude Sonnet 4.5 and DeepSeek: R1 0528 support tool calling?
Anthropic: Claude Sonnet 4.5: yes. DeepSeek: R1 0528: yes.