ChatGPT MCP and Apps: extensions you can try

An OpenAI staff member says MCP servers can be built and deployed directly inside ChatGPT and shared publicly, heating up the tool-hosting race.

A timeline of ChatGPT plugins' three rises and falls, and how this MCP-based Apps SDK, permanent sidebar slot and MCP Events differ.

Using only ChatGPT's web version in iPhone Chrome, a user enabled developer mode, created an MCP app and connected HashPort Wallet via OAuth to check on-chain balances.

An OpenAI staff member says MCP servers can be built in ChatGPT, with access restricted to chosen people or shared with the world.

Ask Dots and it will build an authenticated MCP server with ChatGPT Sites and connect it, freely extending the context Dots can work with.

The author shares a GitHub project where Codex packages local source code and sends it to the Pro model for review, and notes that Pro's thinking level couldn't use MCP mode in the past.

A user turned their personal MCP server into a ChatGPT plugin and says it brought about 10k views to their website.

The author tried turning the 0xDesigner MCP into a ChatGPT plugin but was rejected because ChatGPT doesn't allow digital services or selling credits.

A Japanese developer noticed that ChatGPT Sites can host MCP servers and is thinking about how to use it.

A screenshot demo shows a single prompt creating an MCP server with extensions, deploying it to Sites, turning it into a plugin, and installing it on web, mobile and desktop.

Runway launched a hosted MCP that lets users sign in with their Runway account in ChatGPT, Claude or Cursor to generate images and video, billed against Runway plan credits.

A single post rounds up seven OpenAI updates: Dots agents, GPT-6.1 Sol, faster Codex token generation, Space and Pages, plugin extensions, Codex Cloud and team workflows.