# Migrating off gpt-5.3-codex

**OpenAI** retires **gpt-5.3-codex** on **2027-04-01** (in 178 days).
Documented replacement: **gpt-6-sol**.

Source: https://developers.openai.com/api/docs/deprecations
Source last checked: 2026-10-05.
Calendar as of 2026-10-05 UTC.

| Model | Provider | Retires | Replacement |
|---|---|---|---|
| gpt-5.3-codex | OpenAI | 2027-04-01 | gpt-6-sol |

Also retiring on 2027-04-01:
- gpt-5.4-nano (OpenAI) → gpt-6-luna
- gpt-5.1 (OpenAI) → gpt-6-sol

Source: https://llmlatency.dev/migrate/openai-gpt-5-3-codex