Codestral vs O3 Mini
Performance benchmarks + pricing comparison — updated April 2026
Codestral
MistralMistral's dedicated coding model. Open-weight and highly optimized for code generation and completion.
| Input | $0.300/M |
| Output | $0.900/M |
| Context | 128K tokens |
| Best For | Code completion, code generation, IDE integration |
| Benchmark | 60/100 |
O3 Mini
OpenAIOpenAI's reasoning model at lower cost. Strong at math, coding, and science tasks.
| Input | $1.10/M |
| Output | $4.40/M |
| Context | 200K tokens |
| Best For | Math, science, coding tasks requiring deep reasoning |
| Benchmark | 80/100 |
Benchmark Performance Comparison
Third-party benchmark scores — higher is better. Data sourced from SWE-bench, LiveCodeBench, HumanEval, and BigCodeBench.
| Benchmark | Codestral | O3 Mini | Leader |
|---|---|---|---|
| Overall Score | 60 | 80 | o3-mini leads by 20pts |
| SWE-bench Verified | 54 | 76 | o3-mini leads by 22pts |
| LiveCodeBench | 64 | 85 | o3-mini leads by 21pts |
| HumanEval | 82 | 94 | o3-mini leads by 12pts |
| BigCodeBench | 44 | 65 | o3-mini leads by 21pts |
Cost Comparison by Scenario
Estimated cost per project with 30% cache hit rate. Actual costs may vary based on usage patterns.
| Scenario | Codestral | O3 Mini | Savings |
|---|---|---|---|
| Small Script (1K lines) | $0.04 | $0.17 | Codestral saves $0.13 (78%) |
| Medium Feature (10K lines) | $0.29 | $1.27 | Codestral saves $0.98 (77%) |
| Large Project (50K lines) | $1.43 | $6.33 | Codestral saves $4.90 (77%) |
| Code Review (5K lines) | $0.07 | $0.30 | Codestral saves $0.23 (75%) |
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 |
|---|---|---|---|
| Codestral | 60 | $0.005/pt | Better value |
| O3 Mini | 80 | $0.014/pt | Higher cost per point |
Codestral delivers the best value at $0.005 per score point.
Strengths & Weaknesses
Codestral
- + Code-specialized
- + Very cheap
- - Narrow focus
O3 Mini
- + Excellent at competitive programming
- + Strong algorithmic reasoning
- - Optimized for reasoning, not chat
Verdict
Codestral is cheaper at $0.300/M, but O3 Mini scores higher on benchmarks (80 vs 60).
Choose Codestral for cost-sensitive projects, O3 Mini when performance matters most.
Compare with Other Models
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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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