OpenAI refines enterprise tiers

OpenAI has recut its ChatGPT lineup for work accounts, swapping in GPT-5.3 Instant Mini as the fallback model and publishing a new Codex pricing sheet. (help.openai.com) On April 9, OpenAI said GPT-5.3 Instant Mini replaced GPT-5 Instant Mini for users who hit rate limits on GPT-5.3 Instant, and the fallback model does not appear in the model picker. The company said the newer mini model writes more naturally and has stronger contextual awareness than the older version. (help.openai.com) The model cleanup has been broader than that single swap. OpenAI’s help center says ChatGPT retired GPT-4o, GPT-4.1, GPT-4.1 mini, OpenAI o4-mini, and GPT-5 Instant and Thinking on February 13, 2026, then retired GPT-5.1 Instant, Thinking, and Pro on March 11. (help.openai.com) For business customers, the packaging change is not just about model names. OpenAI says Business, Enterprise, and Education workspaces can bring company knowledge into ChatGPT through connected apps so the system can answer with organization-specific context and cite the original sources. (help.openai.com) That company-knowledge system runs through what OpenAI now calls “apps,” the new name for connectors as of December 17, 2025. The apps framework can search external services, sync content into a workspace knowledge base, and in some cases take actions on a user’s behalf inside ChatGPT. (help.openai.com) OpenAI had given Business, Enterprise, and Education customers extra time with GPT-4o inside Custom GPTs, but that grace period ended on April 3, 2026. Its current help articles say GPT-4o is now fully retired across all plans in ChatGPT, even though API access remains unchanged. (help.openai.com) The pricing signal came on April 2, when OpenAI changed Codex billing from per-message estimates to token-based rates for Plus, Pro, Business, and new Enterprise plans. The rate card says usage is now measured in credits per million input, cached input, and output tokens, a format OpenAI says maps coding costs more directly to actual usage. (help.openai.com) OpenAI’s developer pricing page ties that Codex packaging to enterprise controls. The Business plan includes a dedicated workspace, single sign-on, and a promise that business data is not used for training by default, while Enterprise and Education add controls such as SCIM, encryption key management, audit logs, role-based access control, and data residency options. (developers.openai.com) The result is a simpler split in OpenAI’s work products: newer GPT-5.3 and GPT-5.4 models for ChatGPT, connected company data inside the workspace, and coding tools that now look more like metered infrastructure than an all-you-can-use add-on. (help.openai.com)