GPT-5.5 Instant rollout to ChatGPT and API

OpenAI@OpenAIMay 5, 2026

GPT-5.5 Instant is rolling out over the next two days as the default model to all ChatGPT users, and as ‘gpt-5.5-chat-latest’ in the API. Personalization improvements are rolling out to Plus and Pro users on the web, and soon on mobile. Memory sources are rolling out across all

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Launched May 5, 2026View post

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