Model comparison
o3 vs o1
OpenAI
o3
OpenAI's mainstream reasoning model - production-viable thinking.
OpenAI
o1
The first reasoning model - historically important, now superseded.
Specs
| Metric | o3 | o1 |
|---|---|---|
| Context window | 200K tokens↑ | 200K tokens |
| Input $/1M tokens | $2.00↑ | $15.00 |
| Output $/1M tokens | $8.00↑ | $60.00 |
| Modalities | Image · Text · File | Text · Image · File |
| Open weights | No | No |
| Released | Apr 2025 | Dec 2024 |
Capability differences
| Capability | o3 | o1 |
|---|---|---|
| Tool use | Yes | No |
Key differences
- -Input pricing: o3 at $2.00/1M vs o1 at $15.00/1M.