OpenAI o3 is a reasoning-focused model designed for complex problem solving. It uses chain-of-thought reasoning to break down difficult problems step by step, excelling at mathematics, logic puzzles, and scientific reasoning. While slower than standard models due to its deliberative process, o3 achieves significantly higher accuracy on hard benchmarks.
| Benchmark | Score |
|---|---|
| Arena Elo (LMArena) | 1409 |
| Context Window | 200K |
| Price (input/output) | $10/$40 |
| Date | Prompt /MTok | Completion /MTok |
|---|---|---|
| 2026-08-07 | $2 → $1 | $8 → $4 |
| 2026-08-29 | $1 → $2 | $4 → $8 |
| 2026-09-01 | $2 → $1 | $8 → $4 |
Changes observed across 76 daily OpenRouter catalog snapshots since Jun 19, 2026.