Model retirement and migration policies become a developer-platform risk

Reports say OpenAI is retiring several API model families on timelines shorter than its stated six-month notice policy, with fine-tuning access ending shortly before shutdown; separate GPT-4o user migrations should not be conflated with API retirements. Microsoft Foundry’s November 2026 schedule specifies retirement dates, auto-upgrades, replacements and a potentially breaking Chat Completions/tools compatibility change. Teams should verify affected deployments and test migrations.