OpenAI's FAQ lists December 11, 2026 as the scheduled retirement date, when custom GPTs stop running. The dates shown are for Enterprise workspaces and may change, so check your plan. Details: Custom GPT retirement.
Source: OpenAI's Custom GPT retirement and migration FAQ. OpenAI says dates may change, so check the FAQ for your plan.
Keep reading
Custom GPT to Plugin Migration ChecklistA step-by-step checklist to move a Custom GPT without losing behavior.What Commonly Breaks When You Migrate a Custom GPTActions, tone, sharing settings and file handling are the usual trouble spots.Will my Custom GPT stop working?Existing GPTs stay usable until the retirement date, then stop running.