OpenAI o3 vs DeepSeek Reasoner (R1)
Performance benchmarks + pricing comparison — updated April 2026
OpenAI o3
OpenAINext generation reasoning model. Improved coding and math over o1.
| Input | $10.00/M |
| Output | $40.00/M |
| Context | 200K tokens |
| Best For | Advanced coding, complex problem-solving |
| Benchmark | 85/100 |
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 | OpenAI o3 | DeepSeek Reasoner (R1) | Leader |
|---|---|---|---|
| Overall Score | 85 | 72 | o3 leads by 13pts |
| SWE-bench Verified | 82 | 68 | o3 leads by 14pts |
| LiveCodeBench | 88 | 76 | o3 leads by 12pts |
| HumanEval | 96 | 90 | o3 leads by 6pts |
| BigCodeBench | 74 | 56 | o3 leads by 18pts |
Cost Comparison by Scenario
Estimated cost per project with 30% cache hit rate. Actual costs may vary based on usage patterns.
| Scenario | OpenAI o3 | DeepSeek Reasoner (R1) | Savings |
|---|---|---|---|
| Small Script (1K lines) | $1.55 | $0.08 | DeepSeek Reasoner (R1) saves $1.47 (95%) |
| Medium Feature (10K lines) | $11.50 | $0.63 | DeepSeek Reasoner (R1) saves $10.87 (95%) |
| Large Project (50K lines) | $57.50 | $3.15 | DeepSeek Reasoner (R1) saves $54.35 (95%) |
| Code Review (5K lines) | $2.75 | $0.15 | DeepSeek Reasoner (R1) saves $2.60 (95%) |
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 |
|---|---|---|---|
| OpenAI o3 | 85 | $0.167/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
OpenAI o3
- + Latest reasoning model
- + Top-tier across all benchmarks
- - Very expensive
- - Slow
DeepSeek Reasoner (R1)
- + Strong reasoning chain
- + Good value
- - Slow on simple tasks
Verdict
DeepSeek Reasoner (R1) is cheaper at $0.550/M, but OpenAI o3 scores higher on benchmarks (85 vs 72).
Choose DeepSeek Reasoner (R1) for cost-sensitive projects, OpenAI o3 when performance matters most.
Compare with Other Models
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Claude Opus 4
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Claude 3.5 Sonnet
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Claude 3.5 Haiku
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Claude 3 Opus
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Claude 3 Sonnet
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