OpenAI Assistants API shuts down on August 26, 2026

Applications that create assistants, threads, messages, or runs through the Assistants API must migrate before the removal date.

Recommended action: Inventory Assistants and Threads SDK usage, map it to Responses and Conversations, migrate stored state, and run end-to-end tool and conversation tests before August 26.

Affected: Assistants API, /v1/assistants, /v1/threads, client.beta.assistants, client.beta.threads, assistant, thread, run, client.beta, Assistants API v2