OpenAI's Biggest Deprecation Wave Yet: gpt-4, o1, o4-mini, and 25+ Models Shut Down by October 2026
OpenAI's April 22 deprecation notice covers 25+ model IDs across two hard shutdown dates — July 23 and October 23, 2026. If your routing config still references gpt-4, gpt-3.5-turbo, o1, o3-mini, or o4-mini, you have a breaking change on the calendar.
via OpenAI