Model comparison
o1 vs Gemini 2.5 Flash
OpenAI
o1
The first reasoning model — historically important, now superseded.
Gemini 2.5 Flash
Cheap multimodal at million-token scale.
Specs
| Metric | o1 | Gemini 2.5 Flash |
|---|---|---|
| Context window | 200K tokens | 1.0M tokens↑ |
| Input $/1M tokens | $15.00 | $0.300↑ |
| Output $/1M tokens | $60.00 | $2.50↑ |
| Modalities | Text · Image · File | File · Image · Text · Audio · Video |
| Open weights | No | No |
| Released | Dec 2024 | — |
Capability differences
| Capability | o1 | Gemini 2.5 Flash |
|---|---|---|
| Tool use | No | Yes |
| Vision | No | Yes |
| Prompt caching | No | Yes |
Key differences
- —o1 offers 200K context; Gemini 2.5 Flash offers 1.0M.
- —Input pricing: o1 at $15.00/1M vs Gemini 2.5 Flash at $0.300/1M.