Azure OpenAI o1, o3 and o4-mini Retire November 19, and gpt-4o Follows December 9: List Your Models With One API Call Azure OpenAI models retire from November 19, 2026. One Models API call lists every date for your region, with real output from two regions and the Deprecating versus Deprecated naming trap. Oct 22, 2026 7 min read AI & ML
