Nundina › Discover calendars › Version End-of-Life Dates calendar › OpenAI GPT-5.3-Codex end of lifeOpenAI GPT-5.3-Codex end of life1 April 2027OpenAI GPT-5.3-Codex stops receiving security updates. Released 5 Feb 2026. Source: endoflife.date.Version End-of-Life Dates calendarMore from this calendar