Model comparison
o3 vs Claude Sonnet 4.6
OpenAI
o3
OpenAI's mainstream reasoning model - production-viable thinking.
Anthropic
Claude Sonnet 4.6
The pragmatic default - Claude quality without Opus pricing.
Specs
| Metric | o3 | Claude Sonnet 4.6 |
|---|---|---|
| Context window | 200K tokens | 1M tokens↑ |
| Input $/1M tokens | $2.00↑ | $3.00 |
| Output $/1M tokens | $8.00↑ | $15.00 |
| Modalities | Image · Text · File | Text · Image · File |
| Open weights | No | No |
| Released | Apr 2025 | - |
Capability differences
| Capability | o3 | Claude Sonnet 4.6 |
|---|---|---|
| Vision | No | Yes |
| Prompt caching | No | Yes |
Key differences
- -o3 offers 200K context; Claude Sonnet 4.6 offers 1M.
- -Input pricing: o3 at $2.00/1M vs Claude Sonnet 4.6 at $3.00/1M.