Pyyan / Compare / o3 / o4-mini vs Claude Opus 5
o3 / o4-mini vs Claude Opus 5
2 of 5Language Models · verified 13 Aug 2026
o3 / o4-miniOpenAIretiredClaude Opus 5Anthropiccurrent
| Specification | o3 / o4-mini | Claude Opus 5 |
|---|---|---|
| Summary | The o-series reasoning line, retired Feb 2026. | Complex agentic coding and enterprise work at half the cost of Fable 5. |
| Context | — | 1M |
| Input ($/Mtok) | — | $5 |
| Output ($/Mtok) | — | $25 |
| Licence | Proprietary | Proprietary |
| Max output | — | 128K |
| Released | — | 24 Jul 2026 |
| Model ID | — | claude-opus-5 |
| Category | Language Models | Language Models |
| Official | OpenAI ↗ | Anthropic ↗ |
Highlighted rows are where these differ.
o3 / o4-mini
- Reasoning is now an effort setting on GPT-5.x, not a separate model
Best for nothing — migrate.
Claude Opus 5
- Thinking on by default — a step change over Opus 4.8
- 512-token prompt-cache minimum, down from 1024
- Separate rate-limit bucket from the Opus 4.x pool
Best for agentic coding.