OpenAI's Assistants API shuts down Aug 26 — port your bots now
A hard cutoff, no grace period: threads and runs stop answering. Sora's video API dies Sept 24, GPT-3.5 models Sept 28, and Opus 4.7 already 400s.
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The endpoints go dark on Aug 26
OpenAI permanently removes the Assistants API on Aug 26 — calls to /v1/assistants, /v1/threads and every related route just start failing. The deprecation was announced a year ago, and OpenAI is explicit that there's no grace period and no extension.
Your replacement is two APIs, not one
The migration path is the Responses API plus the Conversations API, and the object model changes underneath you: Threads become Conversations, Runs become Responses, Run Steps become Items, and Assistants become dashboard-only Prompts. Budget real porting time, not a find-and-replace.
Sora's video API is next — Sept 24, no successor
The same deprecation page retires the Videos API and every sora-2 / sora-2-pro alias on Sept 24, with no direct replacement listed. If you generate video through OpenAI, line up another provider before the endpoint disappears.
Sept 28: the last GPT-3.5-era models retire
gpt-3.5-turbo-instruct, babbage-002, davinci-002 and gpt-3.5-turbo-1106 all reach end-of-life on Sept 28, and OpenAI routes everyone to gpt-5.6-terra. If you still lean on those cheap completions endpoints, they're done.
Not just OpenAI: Opus 4.7 already 400s on temperature
Anthropic's Claude Opus 4.7 now rejects the temperature parameter outright — a 400 error, not a warning — so sampling code that worked on 4.6 breaks the moment you point it at 4.7. Strip temperature from the request before you upgrade.