Model comparison
o3 vs Gemini 2.5 Flash
OpenAI
o3
OpenAI's mainstream reasoning model - production-viable thinking.
Gemini 2.5 Flash
Cheap multimodal at million-token scale.
Specs
| Metric | o3 | Gemini 2.5 Flash |
|---|---|---|
| Context window | 200K tokens | 1.0M tokens↑ |
| Input $/1M tokens | $2.00 | $0.300↑ |
| Output $/1M tokens | $8.00 | $2.50↑ |
| Modalities | Image · Text · File | File · Image · Text · Audio · Video |
| Open weights | No | No |
Capability differences
| Capability | o3 | Gemini 2.5 Flash |
|---|---|---|
| Vision | No | Yes |
| Prompt caching | No | Yes |
Key differences
- -o3 offers 200K context; Gemini 2.5 Flash offers 1.0M.
- -Input pricing: o3 at $2.00/1M vs Gemini 2.5 Flash at $0.300/1M.