ChatGPT MCP and Apps: extensions you can try

OpenAI announced an open platform letting developers build fully native apps with plugin extensions and publish them directly inside ChatGPT, reaching over 1.2 billion weekly active users.

ChatGPT can now create MCP servers, add extensions, deploy to ChatGPT Sites, turn them into plugins and control permissions, so small personal needs no longer require a standalone app.

A developer shares OpenAI's official documentation on building plugin extensions, which make plugin experiences inside ChatGPT more complete and self-contained.

A distribution tip for developers: package your best skills as ChatGPT Sites with an MCP, submit them as a plugin to ChatGPT's plugin directory and get early distribution.

OpenAI now lets developers host MCP servers on Sites and turn them into ChatGPT plugins, so cloud ChatGPT can reach them without a self-maintained server.

Blockworks released an official ChatGPT plugin that connects users to its data, with answers appearing in the conversation within minutes, the author says.

Blockworks launched an MCP server that lets tools like ChatGPT and Claude search its crypto data, with press coverage from The Defiant and Unchained linked in the post.

A developer says plugin extensions let MCP servers be built and deployed directly in ChatGPT, opening up a wide range of possibilities.

MCP servers can now be built and deployed inside ChatGPT, shared with specific people or made public, with publishing and permissions in one place, though public sharing raises permission-scoping security concerns.

OpenAI lets users build sites and host MCP servers in ChatGPT with natural language, with built-in permission controls and plugin distribution, removing the need for self-hosted servers and auth.

Cinema 4D adds official MCP support so ChatGPT or Claude can organize scenes and generate objects and materials from text prompts, with results editable and undoable by hand.

A developer packaged the same MCP into ChatGPT's plugin zip format, submitted it for review, and shared a screenshot while waiting for the result.