Microsoft retires the Azure OpenAI Assistants API on August 26, 2026 — 19 days' notice for anyone still on it. The replacement is Foundry Agents, and the migration tool moves your code but not your data: past threads, runs, and messages don't come across.
What's covered
- What actually retires
- The detail that catches teams out: your data doesn't come along
- The 19-day checklist
- The pattern behind the deadline
Full guide with every version, risk scores, and live updates: https://endoflife.ai/article-azure-openai-assistants-retirement
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