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2 records from OpenAI.
OpenAI Assistants API shuts down on August 26, 2026
OpenAI is removing the Assistants API and directs developers to the Responses API and Conversations API.
api sunsetInventory 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.
Four legacy OpenAI models shut down on September 28, 2026
OpenAI is removing four older GPT and base-model IDs and recommends GPT-5.4 mini or GPT-5 mini.
model shutdownReplace the retired model ID with an official recommended model, update the API request shape where required, and regression-test prompts and outputs.