OpenAI Assistants API Migration: Why Responses API Should Be Your New Architecture

OpenAI Assistants API is moving toward shutdown, and projects built around Assistant, Thread and Run abstractions need a migration plan.

This article explains:

• why simply replacing old APIs is risky
• how to separate instructions, tools, state and business logic
• when Responses API is enough
• when a custom AI Agent architecture is still required

Full technical migration guide:

https://www.xbstack.com/ai/openai-assistants-api-vs-custom-agent/