OpenAI o3 vs DeepSeek Chat V3
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 Chat V3
DeepSeekVery affordable general-purpose model from DeepSeek. Strong coding and reasoning at low cost.
| Input | $0.270/M |
| Output | $1.10/M |
| Context | 128K tokens |
| Best For | Cost-sensitive projects, coding, general tasks |
| Benchmark | 62/100 |
Benchmark Performance Comparison
Third-party benchmark scores — higher is better. Data sourced from SWE-bench, LiveCodeBench, HumanEval, and BigCodeBench.
| Benchmark | OpenAI o3 | DeepSeek Chat V3 | Leader |
|---|---|---|---|
| Overall Score | 85 | 62 | o3 leads by 23pts |
| SWE-bench Verified | 82 | 56 | o3 leads by 26pts |
| LiveCodeBench | 88 | 64 | o3 leads by 24pts |
| HumanEval | 96 | 84 | o3 leads by 12pts |
| BigCodeBench | 74 | 46 | o3 leads by 28pts |
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 Chat V3 | Savings |
|---|---|---|---|
| Small Script (1K lines) | $1.55 | $0.04 | DeepSeek Chat V3 saves $1.51 (97%) |
| Medium Feature (10K lines) | $11.50 | $0.31 | DeepSeek Chat V3 saves $11.19 (97%) |
| Large Project (50K lines) | $57.50 | $1.57 | DeepSeek Chat V3 saves $55.93 (97%) |
| Code Review (5K lines) | $2.75 | $0.07 | DeepSeek Chat V3 saves $2.68 (97%) |
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 Chat V3 | 62 | $0.004/pt | Better value |
DeepSeek Chat V3 delivers the best value at $0.004 per score point.
Strengths & Weaknesses
OpenAI o3
- + Latest reasoning model
- + Top-tier across all benchmarks
- - Very expensive
- - Slow
DeepSeek Chat V3
- + Excellent value
- + Strong coding focus
- - Less general-purpose
Verdict
DeepSeek Chat V3 is cheaper at $0.270/M, but OpenAI o3 scores higher on benchmarks (85 vs 62).
Choose DeepSeek Chat V3 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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