# Migrating off gpt-4-turbo-completions

**OpenAI** retires **gpt-4-turbo-completions** on **2026-10-23** (in 38 days).
Documented replacement: **gpt-5.6-sol**.

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 |
|---|---|---|---|
| gpt-4-turbo-completions | OpenAI | 2026-10-23 | gpt-5.6-sol |

Also retiring on 2026-10-23:
- gpt-3.5-turbo-0125 (OpenAI) → gpt-5.6-terra
- gpt-4-0613 (OpenAI) → gpt-5.6-sol
- gpt-4-turbo (OpenAI) → gpt-5.6-sol
- gpt-4.1-nano (OpenAI) → gpt-5.6-luna
- gpt-4o-2024-05-13 (OpenAI) → gpt-5.6-sol
- gpt-image-1 (OpenAI) → gpt-image-2
- o1-2024-12-17 (OpenAI) → gpt-5.6-sol
- o1-pro-2025-03-19 (OpenAI) → gpt-5.6-sol (reasoning.mode: pro)
- o3-mini-2025-01-31 (OpenAI) → gpt-5.6-sol
- ft-o4-mini-2025-04-16 (OpenAI) → gpt-5.6-terra

Source: https://llmlatency.dev/migrate/openai-gpt-4-turbo-completions