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OpenAI removes the Assistants API on 26 August 2026. Threads become Conversations, Runs become Responses, and the tool-call loop becomes your code. Here is the mapping, the hidden cost changes, and a three-week plan.
Agent Builder and the Evals platform leave OpenAI on November 30, 2026, and the Assistants API sunsets August 26. How to choose among the Responses API, Chat Completions, the Agents SDK and AgentKit for new agents
OpenAI's Assistants API sunsets on 26 August 2026, 36 days from now. The replacement objects do not map one to one, prompts are dashboard-only, and OpenAI will not ship a thread migration tool.
