# Migrating off o1-preview

**OpenAI** retires **o1-preview** on **2025-07-28**.
Documented replacement: **o3**.

Source: https://developers.openai.com/api/docs/deprecations
Source last checked: 2026-09-15.
Calendar as of 2026-09-15 UTC.

| Model | Provider | Retires | Replacement |
|---|---|---|---|
| o1-preview | OpenAI | 2025-07-28 | o3 |

Source: https://llmlatency.dev/migrate/openai-o1-preview