Yup. ChatGPT did not have proper MCP support until now. They only supported MCP for connecting Deep Research to additional data sources, and for that, your MCP server had to implement two specific tools that Deep Research is able to call.

What’s being released here is really just proper MCP support in ChatGPT (like Claude has had for ages now) though their instructions regarding needing to specific about which tools to use make me wonder how effective it will be compared to Claude. I assume it’s hidden behind “Developer Mode” to discourage the average ChatGPT user from using it given the risks around giving an LLM read/write access to potentially sensitive data.