OpenAI to retire GPT-3.5, GPT-4 and legacy APIs by October 2026

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OpenAI has published a series of model deprecation deadlines, with the Assistants API already shut down on 26 August 2026. Key upcoming cutoffs include the Videos API and sora-2 on 24 September, legacy completion snapshots on 28 September, and gpt-3.5-turbo and gpt-4 on 23 October 2026. Businesses that built AI-powered tools such as chatbots or email classifiers in 2023–2024 are likely relying on these soon-to-be-retired models. Unlike a gradual slowdown, deprecated models will return errors immediately upon shutdown, causing automations to fail without warning. A common complication is that retirement notices are sent to the developer account that holds the API key, which often belongs to an external agency rather than the business itself.

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