Model comparison
o1 vs Claude Haiku 4.5
OpenAI
o1
The first reasoning model — historically important, now superseded.
Anthropic
Claude Haiku 4.5
Fast, cheap, surprisingly capable for high-volume jobs.
Specs
| Metric | o1 | Claude Haiku 4.5 |
|---|---|---|
| Context window | 200K tokens↑ | 200K tokens |
| Input $/1M tokens | $15.00 | $1.00↑ |
| Output $/1M tokens | $60.00 | $5.00↑ |
| Modalities | Text · Image · File | Image · Text |
| Open weights | No | No |
| Released | Dec 2024 | Oct 2025 |
Capability differences
| Capability | o1 | Claude Haiku 4.5 |
|---|---|---|
| Tool use | No | Yes |
| Vision | No | Yes |
| Prompt caching | No | Yes |
Key differences
- —Input pricing: o1 at $15.00/1M vs Claude Haiku 4.5 at $1.00/1M.