ChatGPT release notes update

OpenAI’s ChatGPT release notes now read less like one launch and more like a running map of who gets which tools, models, and controls. (help.openai.com) The main consumer changelog was updated April 12 and lists recent additions including ChatGPT in Apple CarPlay on April 2, updated Box, Notion, Linear, and Dropbox apps on March 27, and a simplified mobile sidebar on March 26. The new mobile layout puts plan-based experiences such as Images, Codex, Pulse, and Apps in a horizontal bar above chats and projects. (help.openai.com) Across OpenAI’s help center, the updates are split into separate logs for core ChatGPT, Business, and Enterprise and Edu, with distinct entries for pricing, admin controls, and model limits. On April 8, ChatGPT Business added Outlook shared mailbox and shared calendar actions, and on April 9, Enterprise and Edu added a control for whether Security Assertion Markup Language and System for Cross-domain Identity Management groups appear in sharing menus. (help.openai.com 1) (help.openai.com 2) The model lineup has shifted at the same time. OpenAI says GPT-4o, GPT-4.1, GPT-4.1 mini, OpenAI o4-mini, and GPT-5 Instant and Thinking were retired from ChatGPT on February 13, 2026, with GPT-5.1 Instant, Thinking, and Pro retired on March 11, while GPT-5.3 became the default logged-in experience and GPT-5.4 Thinking became the higher-end reasoning option. (help.openai.com 1) (help.openai.com 2) That reshuffle sits alongside a packaging push around work products. OpenAI’s Projects feature, updated April 6, is now available to free and paid users globally, while Business, Enterprise, and Edu workspaces can also share projects with teammates. (help.openai.com) The same pattern shows up in apps, the new name for connectors. OpenAI says it renamed connectors to apps on December 17, 2025, and the category now covers both interactive tools and data connections that let ChatGPT search, reference, act on external services, or sync content into a workspace knowledge base. (help.openai.com) Those apps are increasingly tied to plan boundaries and admin settings. In Enterprise and Edu, the updated Box, Notion, Linear, and Dropbox apps released March 27 are disabled by default until workspace admins enable them, while Business admins are told to review Outlook action controls before turning on new delegated email and calendar features. (help.openai.com 1) (help.openai.com 2) Pricing and seat design are moving too. OpenAI introduced Codex-only seats for Business and Enterprise on April 2 with usage-based pricing and no fixed monthly per-user cost, and Business subscriptions were cut by $5 per month at the same time, with credits applied for prorated differences on current bills. (help.openai.com) (help.openai.com) Even the fallback behavior is now plan-specific. Enterprise and Edu release notes on April 9 say GPT-5.3 Instant Mini replaced GPT-5 Instant Mini as the fallback model after users hit GPT-5.3 Instant rate limits, and the company says that fallback model does not appear in the picker. (help.openai.com) Taken together, the release notes show ChatGPT being broken into layers: a default GPT-5.3 experience for most logged-in users, premium reasoning through GPT-5.4, shared workspaces through Projects, and a growing app system whose permissions, sync, and actions depend on plan and administrator settings. (help.openai.com) (help.openai.com) (help.openai.com)