Claude Sonnet 4 vs DeepSeek Reasoner (R1)
Performance benchmarks + pricing comparison — updated April 2026
Claude Sonnet 4
AnthropicAnthropic's balanced model for coding and general tasks. Best price-performance ratio in the Claude family.
| Input | $3.00/M |
| Output | $15.00/M |
| Context | 200K tokens |
| Best For | Day-to-day coding, code review, documentation |
| Benchmark | 78/100 |
DeepSeek Reasoner (R1)
DeepSeekDeepSeek's reasoning model. Comparable to OpenAI's o1 but at much lower cost.
| Input | $0.550/M |
| Output | $2.19/M |
| Context | 128K tokens |
| Best For | Complex reasoning, math, advanced coding |
| Benchmark | 72/100 |
Benchmark Performance Comparison
Third-party benchmark scores — higher is better. Data sourced from SWE-bench, LiveCodeBench, HumanEval, and BigCodeBench.
| Benchmark | Claude Sonnet 4 | DeepSeek Reasoner (R1) | Leader |
|---|---|---|---|
| Overall Score | 78 | 72 | Claude Sonnet 4 leads by 6pts |
| SWE-bench Verified | 74 | 68 | Claude Sonnet 4 leads by 6pts |
| LiveCodeBench | 82 | 76 | Claude Sonnet 4 leads by 6pts |
| HumanEval | 92 | 90 | Claude Sonnet 4 leads by 2pts |
| BigCodeBench | 64 | 56 | Claude Sonnet 4 leads by 8pts |
Cost Comparison by Scenario
Estimated cost per project with 30% cache hit rate. Actual costs may vary based on usage patterns.
| Scenario | Claude Sonnet 4 | DeepSeek Reasoner (R1) | Savings |
|---|---|---|---|
| Small Script (1K lines) | $0.62 | $0.08 | DeepSeek Reasoner (R1) saves $0.53 (86%) |
| Medium Feature (10K lines) | $4.66 | $0.63 | DeepSeek Reasoner (R1) saves $4.03 (86%) |
| Large Project (50K lines) | $23.29 | $3.15 | DeepSeek Reasoner (R1) saves $20.14 (86%) |
| Code Review (5K lines) | $1.20 | $0.15 | DeepSeek Reasoner (R1) saves $1.05 (87%) |
Value Analysis (Price per Benchmark Score Point)
Lower is better — how much you pay for each point of benchmark performance.
| Model | Overall Score | Price per Score Point | Verdict |
|---|---|---|---|
| Claude Sonnet 4 | 78 | $0.038/pt | Higher cost per point |
| DeepSeek Reasoner (R1) | 72 | $0.008/pt | Better value |
DeepSeek Reasoner (R1) delivers the best value at $0.008 per score point.
Strengths & Weaknesses
Claude Sonnet 4
- + Price-performance leader
- + Strong at web development
- + Excellent code review
- - Struggles with complex algorithms
- - Less consistent on system design
DeepSeek Reasoner (R1)
- + Strong reasoning chain
- + Good value
- - Slow on simple tasks
Verdict
DeepSeek Reasoner (R1) is cheaper at $0.550/M, but Claude Sonnet 4 scores higher on benchmarks (78 vs 72).
Choose DeepSeek Reasoner (R1) for cost-sensitive projects, Claude Sonnet 4 when performance matters most.
Compare with Other Models
Claude Opus 4
AnthropicAnthropic's most powerful model. Best for complex reasoning and challenging coding tasks.
Claude 3.5 Sonnet
AnthropicPrevious generation Sonnet. Still excellent for coding tasks at the same price point.
Claude 3.5 Haiku
AnthropicFast, cost-effective model for high-volume tasks. Great for code review and simple queries.
Claude 3 Opus
AnthropicFirst generation Opus. Highest reasoning capability in the Claude 3 family.
Claude 3 Sonnet
AnthropicFirst generation Sonnet. Balanced performance for general tasks.
Claude 3 Haiku
AnthropicCheapest Claude model. Fast responses for simple tasks and basic coding.