Overview
o3 is OpenAI's advanced reasoning model, designed for complex problem-solving in mathematics, science, and logic. It uses extended chain-of-thought processing to tackle problems that require multi-step reasoning and careful verification.
Context Window
200K tokens
Knowledge Cutoff
December 2025
Pricing (Input)
$10.00 / 1M tokens
Pricing (Output)
$40.00 / 1M tokens
✅Strengths
- ✓State-of-the-art mathematical reasoning
- ✓Exceptional performance on science benchmarks
- ✓Advanced logical deduction and verification
- ✓200K context for complex document analysis
- ✓Self-correction and error detection
⚠️Weaknesses
- ✗Higher latency due to extended reasoning
- ✗Most expensive OpenAI model
- ✗Overkill for simple tasks
- ✗Closed weights - API only
Best Use Cases
🔬 Scientific Research
Complex proofs, hypothesis testing
📐 Advanced Mathematics
Competition math, research-level problems
💻 Algorithm Design
Complex algorithms, optimization
⚖️ Legal Analysis
Case law, contract review
🏥 Medical Diagnosis
Differential diagnosis, research
📊 Financial Modeling
Risk analysis, quantitative finance
Benchmarks
MMLU95.2%
AIME (Math)96.4%
GPQA (Science)94.8%