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Claude Sonnet 4.5 vs DeepSeek R1
A detailed comparison of Claude Sonnet 4.5 (Anthropic) and DeepSeek R1 (DeepSeek) across pricing, performance, and features.
Pricing Comparison
| Metric | Claude Sonnet 4.5 | DeepSeek R1 | Difference |
|---|---|---|---|
| Input / 1M tokens | $3.00 | $0.55 | -82% |
| Output / 1M tokens | $15.00 | $2.19 | -85% |
| Context window | 200K | 128K | — |
| Max output | 16K | 64K | — |
Benchmark Comparison
| Benchmark | Claude Sonnet 4.5 | DeepSeek R1 |
|---|---|---|
| MMLU-Pro | 84.5% | 84% |
| HumanEval | 93% | 92% |
| GPQA | 68.2% | 71.5% |
Capabilities
| Capability | Claude Sonnet 4.5 | DeepSeek R1 |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✗ |
| vision | ✓ | ✗ |
Claude Sonnet 4.5 Strengths
- ✓Well-tested and stable
- ✓Strong coding and analysis
Claude Sonnet 4.5 Weaknesses
- ✗Superseded by Sonnet 4.6
- ✗Same price as the newer model
DeepSeek R1 Strengths
- ✓Cheapest reasoning model available
- ✓Strong math and science performance
- ✓Open-source with off-peak discounts
DeepSeek R1 Weaknesses
- ✗Slower than non-reasoning models
- ✗No vision or tool-use
- ✗China-based — availability concerns
Quick Verdict
Best value: DeepSeek R1 is the more affordable option at $0.55/$2.19 per 1M tokens.
Higher benchmarks: DeepSeek R1 scores higher on average across available benchmarks (82.5% avg).
Larger context: Claude Sonnet 4.5 supports 200K tokens.
Choose DeepSeek R1 if cost matters most. Choose Claude Sonnet 4.5 if you need the best possible quality for complex tasks.