Claude 3.5 Sonnet vs DeepSeek Reasoner (R1)
Performance benchmarks + pricing comparison — updated April 2026
Claude 3.5 Sonnet
AnthropicPrevious generation Sonnet. Still excellent for coding tasks at the same price point.
| Input | $3.00/M |
| Output | $15.00/M |
| Context | 200K tokens |
| Best For | Coding assistants, web development, data analysis |
| Benchmark | 72/100 |
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 3.5 Sonnet | DeepSeek Reasoner (R1) | Leader |
|---|---|---|---|
| Overall Score | 72 | 72 | Claude 3.5 Sonnet leads by 0pts |
| SWE-bench Verified | 68 | 68 | Claude 3.5 Sonnet leads by 0pts |
| LiveCodeBench | 75 | 76 | DeepSeek Reasoner (R1) leads by 1pts |
| HumanEval | 90 | 90 | Claude 3.5 Sonnet leads by 0pts |
| BigCodeBench | 58 | 56 | Claude 3.5 Sonnet leads by 2pts |
Cost Comparison by Scenario
Estimated cost per project with 30% cache hit rate. Actual costs may vary based on usage patterns.
| Scenario | Claude 3.5 Sonnet | 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 3.5 Sonnet | 72 | $0.042/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 3.5 Sonnet
- + Balanced performance
- + Computer use capability
- + Artifact generation
- - Older architecture
- - Falling behind Sonnet 4
DeepSeek Reasoner (R1)
- + Strong reasoning chain
- + Good value
- - Slow on simple tasks
Verdict
DeepSeek Reasoner (R1) is cheaper at $0.550/M, but Claude 3.5 Sonnet scores higher on benchmarks (72 vs 72).
Choose DeepSeek Reasoner (R1) for cost-sensitive projects, Claude 3.5 Sonnet when performance matters most.
Compare with Other Models
Claude Sonnet 4
AnthropicAnthropic's balanced model for coding and general tasks. Best price-performance ratio in the Claude family.
Claude Opus 4
AnthropicAnthropic's most powerful model. Best for complex reasoning and challenging coding tasks.
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.