Apps SDK changelog

ChatGPT is now fully compatible with the MCP Apps spec.

window.openai.openExternal({ href, redirectUrl }) supports redirectUrl: false, which prevents the host from appending ?redirectUrl=... to external links.

window.openai.setOpenInAppUrl({ href }) is the supported way to override the fullscreen “Open in ” destination; if you do not call it, ChatGPT keeps opening the widget’s current iframe path.

openai/widgetDescription is honored during resource construction and takes precedence over resource.description when present.

window.openai.sendFollowUpMessage supports a scrollToBottom parameter; it defaults to true, and you can pass false to opt out.

Added company knowledge in ChatGPT compatibility guidance for the search/fetch tools. Click here to learn more.

Tool calls now include _meta["openai/session"], an anonymized conversation id you can use to correlate requests within a ChatGPT session.

window.openai.requestModal({ template }) now supports opening a different registered UI template by passing the template URI from registerResource.

Published a new Apps SDK state management guide.

Added copy functionality to all code snippets.

Launched a unified developers changelog.