# Migrating off o1

**OpenAI** retires **o1** on **2026-10-23** (in 85 days).
Documented replacement: **gpt-5.6-sol**.

Source: https://developers.openai.com/api/docs/deprecations

| Model | Provider | Retires | Replacement |
|---|---|---|---|
| o1 | OpenAI | 2026-10-23 | gpt-5.6-sol |

Also retiring on 2026-10-23:
- ft-babbage-002 (OpenAI) → gpt-5.4-mini
- ft-davinci-002 (OpenAI) → gpt-5.4-mini
- ft-gpt-3.5-turbo (OpenAI) → gpt-5.4-mini
- ft-gpt-4 (OpenAI) → gpt-5.5
- ft-gpt-4.1-nano-2025-04-14 (OpenAI) → gpt-5.4-nano
- ft-o4-mini-2025-04-16 (OpenAI) → gpt-5.6-terra
- gpt-3.5-turbo (OpenAI) → gpt-5.6-terra
- gpt-4 (OpenAI) → gpt-5.6-sol
- gpt-4-turbo (OpenAI) → gpt-5.6-sol
- gpt-4.1-nano (OpenAI) → gpt-5.6-luna

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