GPTs Custom Actions expand

OpenAI has expanded Custom Actions in custom ChatGPT bots to work with GPT-4o and GPT-4.1 on the web for Plus, Pro, and Team accounts. (help.openai.com) Custom Actions let a custom GPT call outside application programming interfaces, or APIs, so a bot can pull data from another service or trigger a task beyond ChatGPT itself. OpenAI’s developer docs say these actions are stored inside custom GPTs and connect ChatGPT to third-party services through REST APIs. (developers.openai.com) The release note says the new model support is live on the web for Plus, Pro, and Team users, while Enterprise and Education are listed as “coming soon.” A separate Enterprise and Education release note dated April 9, 2026 says those workspaces can now choose from a full set of models when building custom GPTs, including GPT-4o. (help.openai.com 1) (help.openai.com 2) The change lands inside ChatGPT’s builder tools, not as a new base model launch. OpenAI’s GPT editing guide says builders can configure instructions, knowledge, capabilities, apps, actions, and version history inside a custom GPT. (help.openai.com) OpenAI introduced GPTs in November 2023 as customizable versions of ChatGPT that could be shared publicly, and it said at the time that builders could define custom actions by exposing one or more APIs. The new update extends that workflow to additional model choices on the web. (openai.com) (help.openai.com) The timing is notable because OpenAI has been reshuffling which models appear inside ChatGPT. OpenAI’s help center says GPT-4o, GPT-4.1, GPT-4.1 mini, and several other models were retired from general ChatGPT availability on February 13, 2026, even as some legacy access remained for business and education customers during a transition period. (help.openai.com 1) (help.openai.com 2) That leaves this update looking more like an expansion of workflow and admin controls than a fresh model debut. OpenAI’s current release notes are dominated by GPT-5 rollouts and workspace management changes, while the Custom Actions item adds another way for paying teams to wire ChatGPT into existing software. (help.openai.com 1) (help.openai.com 2) For users building internal assistants, the practical effect is simple: more custom GPTs can now reach outside ChatGPT and do work in other systems from the web interface. For everyone else, the next milestone is the “coming soon” rollout OpenAI listed for Enterprise and Education. (developers.openai.com) (help.openai.com)