Model comparison
o3 vs Claude Opus 4.8
OpenAI
o3
OpenAI's mainstream reasoning model - production-viable thinking.
Anthropic
Claude Opus 4.8
Anthropic's heavyweight for hard reasoning and agentic work.
Specs
| Metric | o3 | Claude Opus 4.8 |
|---|---|---|
| Context window | 200K tokens | 1M tokens↑ |
| Input $/1M tokens | $2.00↑ | $5.00 |
| Output $/1M tokens | $8.00↑ | $25.00 |
| Modalities | Image · Text · File | Text · Image |
| Open weights | No | No |
| Released | Apr 2025 | May 2026 |
Capability differences
| Capability | o3 | Claude Opus 4.8 |
|---|---|---|
| Vision | No | Yes |
| Prompt caching | No | Yes |
Key differences
- -o3 offers 200K context; Claude Opus 4.8 offers 1M.
- -Input pricing: o3 at $2.00/1M vs Claude Opus 4.8 at $5.00/1M.