MCP 2026-07-28 from the server side: Codex already speaks it, Claude doesn't yet
The Model Context Protocol (MCP) released a new specification on July 28, 2026. Codex already implements it, but Claude does not yet support the update.
- MCP 2026-07-28 is the latest specification update released on July 28, 2026.
- Codex (Anthropic) already supports the new MCP spec, while Claude does not yet implement it.
- The update focuses on server-side protocol refinements, including authentication and data streaming.
- Developers must review the changes to maintain compatibility with MCP-compatible tools.
The Model Context Protocol (MCP) project published a new specification revision on July 28, 2026, introducing updates to its server-side protocol. This revision, labeled 2026-07-28, aims to standardize how AI models interact with external tools and data sources. Codex, an AI model from Anthropic, has already integrated support for this new spec, demonstrating rapid adoption. However, Claude, another prominent AI model, has not yet implemented the changes, creating a gap in compatibility for developers relying on MCP for tool integration.
The update reflects ongoing efforts to refine MCP as a universal standard for AI model context management. Server-side implementations are critical for enabling seamless tool use, and the new spec includes refinements to authentication, data streaming, and error handling. Developers building MCP-compatible servers or clients will need to review the changes to ensure compatibility with the latest version.
Developers need to update MCP-compatible tools to align with the new spec.
MCP standardization efforts continue, with varying support across AI models.
- MCP
- Model Context Protocol, a standard for AI model interaction with external tools and data sources.
- spec
- Specification, a detailed description of the technical requirements for a protocol or system.
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