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