Eleven model snapshots retire on October 23. Find them in your repo before your users do

OpenAI shuts down eleven model snapshots on 2026-10-23, among them gpt-4-turbo, gpt-4o-2024-05-13, o3-mini and o4-mini. The GPT-5 and o3 snapshots follow on 2026-12-11. Anthropic and Google retire models on their own schedules too. Most codebases find out when requests start returning 404.