SIDE BY SIDE
o1-pro vs o3
Both are OpenAI o-series models. o3 was added to OpenRouter on 2025-04-16, o1-pro on 2025-03-19.
| Field | o1-pro | o3 |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Family | OpenAI o-series | OpenAI o-series |
| Province | The High Peaks | The High Peaks |
| Context window | 200K tokens | 200K tokens |
| Maximum output | 100K tokens | 100K tokens |
| Input / 1M tokens | $150.0 | $2.00 |
| Output / 1M tokens | $600.0 | $8.00 |
| Accepts | text, files, images | text, files, images |
| Produces | text | text |
| Reasoning | Yes | Yes |
| Tool use | No | Yes |
| Added to OpenRouter | 2025-03-19 | 2025-04-16 |
| Model ID | openai/o1-pro | openai/o3 |
Questions and answers
Which is cheaper, o1-pro or o3?
o3 costs less for both input ($2.00 vs $150.0) and output ($8.00 vs $600.0) per million tokens. On input, o3 is 99% cheaper.
Which has the larger context window?
Both have a 200K-token context window.
What can one do that the other cannot?
Only o3 supports tool use.
Answers are computed from the 2026-10-24 catalog snapshot.