Three OpenAI API shutdowns — Oct 23 (o1, o1-pro, o3-mini, o4-mini), Dec 11 (o3, o3-pro, gpt-5 family), Jan 14 (gpt-4o, gpt-4o-mini). After a cliff, those IDs 404. Cutoff migrates you off: a scanner mapping every dying model ID to OpenAI's named replacement, rate math on your volume, the 72-hour Oct-23 checklist, the hidden-token warning, and the promo cliffs — plus a spend guard (402 cutoff, kill switch) for the new models. Dates/rates: valueaddvc.com, Oct 15 2026.