There is no information in the provided knowledge sources indicating that OpenAI considers Custom GPTs to be obsolete or that they are being replaced by MCP (Model Context Protocol). In fact, the latest release notes and help articles show that Custom GPTs continue to receive new features and expanded model support, including the ability for creators to select from all available ChatGPT models and set recommended models for their GPTs. GPTs with custom actions currently support GPT-4o and 4.1, while those without actions can use any available model. This functionality is being rolled out across Plus, Pro, Team, Enterprise, and Edu plans, and there is no mention of deprecation or reduced support for Custom GPTsExpanded Model Support for Custom GPTs.
MCP is described as a protocol for building custom connectors to proprietary systems, primarily for use in "deep research" scenarios within ChatGPT for Team, Enterprise, and Edu customers. MCP enables integration with a broader range of internal and external tools, but it is positioned as a way to extend ChatGPT’s capabilities, not as a replacement for Custom GPTs. MCP connectors are available only in deep research and require admin setup, whereas Custom GPTs are designed for a broader audience, including non-developers, and can be created and shared easily within ChatGPTCustom connectors via Model Context Protocol (Beta).