Pyyan / Compare / o3 / o4-mini vs GPT-5.6 Sol
o3 / o4-mini vs GPT-5.6 Sol
2 of 5Language Models · verified 13 Aug 2026
o3 / o4-miniOpenAIretiredGPT-5.6 SolOpenAIcurrent| Specification | o3 / o4-mini | GPT-5.6 Sol |
|---|---|---|
| Summary | The o-series reasoning line, retired Feb 2026. | Flagship tier of the GPT-5.6 family. |
| Context | — | 1M+ |
| Licence | Proprietary | Proprietary |
| Released | — | 9 Jul 2026 |
| Category | Language Models | Language Models |
| Official | OpenAI ↗ | OpenAI ↗ |
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.
GPT-5.6 Sol
- Three tiers: Sol, Terra, Luna
- Adjustable reasoning effort from none to max
- Broad rollout began 9 July 2026
Best for all-round work.