ChatGPT is rolling out mobile account switching, locked chats and new work tools; iCloud Mail and Calendar connections are available on selected platforms.

Recent changes in OpenAI’s release notes:

• October 30 — Account switching is rolling out on iOS and Android, allowing two signed-in accounts with separate chats, memory, settings and subscriptions. OpenAI did not specify plan eligibility. • October 28 — Texting your dot is beginning a U.S. Pro beta through iMessage or Android RCS. It shares the dot’s memory and plugins; third-party provider Linq handles messages. • October 27 — iCloud Mail and Calendar plugins are available to all ChatGPT plans on web, desktop and iOS. • October 26 — GPT-6.1 Terra is rolling out in ChatGPT Work to Plus, Pro, Business, Enterprise and Edu, subject to account, region and workspace settings; it is not in the Chat tab. • October 20 — Locked chats are rolling out gradually to Free, Go, Plus and Pro on web, iOS, Android and the Windows and macOS desktop app. • October 16 — ChatGPT Slides is rolling out on web and desktop to eligible Pro, Business and Enterprise users with Space access. • October 14 — OpenAI announced retirement of GPT-5.5 from ChatGPT and Work.

Rollout eligibility does not mean every eligible account has access yet. Sources: https://help.openai.com/en/articles/6825453-chatgpt-release-notes and https://help.openai.com/en/articles/9624314-model-release-notes