# Model Context Protocol changelog > An open protocol for connecting AI applications to external tools, data and context. - Vendor: Anthropic - Category: Developer Tools - Official site: https://modelcontextprotocol.io - Tracked by: What's New (https://whatsnew.fyi/product/model-context-protocol) - Harvested from: GitHub (modelcontextprotocol/modelcontextprotocol) - Entries below: 9 (newest first) What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog. ## Releases ### 2026-07-28 - Date: 2026-07-28 - Version: 2026-07-28 - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2026-07-28 - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2026-07-28 This release marks the **stable release** of the `2026-07-28` revision of the Model Context Protocol. The specification is available on the [official Model Context Protocol website](https://modelcontextprotocol.io/specification/2026-07-28). For a detailed overview of changes, see [2026-07-28 changelog](https://modelcontextprotocol.io/specification/2026-07-28/changelog). ### 2026-07-28-RC — 2026-07-28 RC - Date: 2026-05-29 - Version: 2026-07-28-RC - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2026-07-28-RC - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2026-07-28-rc - Labels: Pre-release This release marks the **release candidate (RC)** `2026-07-28` revision of the Model Context Protocol. The specification is available in [draft form](https://modelcontextprotocol.io/specification/draft). For a detailed overview of changes, see [2026-07-28 draft changelog](https://modelcontextprotocol.io/specification/draft/changelog). >[!NOTE] >**To users and implementers:** this specification is not final. Changes may be introduced between the RC and the final release. SDKs will adopt this version at their own pace, and the prior version of the spec may remain in use for an undetermined amount of time. > >Refer to the [Version Negotiation documentation](https://modelcontextprotocol.io/specification/draft/basic/lifecycle#version-negotiation) to learn about the process for clients and servers to determine the version of the protocol being used. ### 2025-11-25 - Date: 2025-11-25 - Version: 2025-11-25 - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2025-11-25 - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2025-11-25 This release marks the **stable release** of the `2025-11-25` revision of the Model Context Protocol. The specification is available on the [official Model Context Protocol website](https://modelcontextprotocol.io/specification/2025-11-25). For a detailed overview of changes, see [2025-11-25 changelog](https://modelcontextprotocol.io/specification/2025-11-25/changelog). ### 2025-11-25-RC - Date: 2025-11-15 - Version: 2025-11-25-RC - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2025-11-25-RC - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2025-11-25-rc - Labels: Pre-release This release marks the **release candidate (RC)** `2025-11-25` revision of the Model Context Protocol. The specification is available in [draft form](https://modelcontextprotocol.io/specification/draft). For a detailed overview of changes, see [2025-11-25 draft changelog](https://modelcontextprotocol.io/specification/draft/changelog). >[!NOTE] >**To users and implementers:** this specification is not final. Changes may be introduced between the RC and the final release. SDKs will adopt this version at their own pace, and the prior version of the spec may remain in use for an undetermined amount of time. > >Refer to the [Version Negotiation documentation](https://modelcontextprotocol.io/specification/draft/basic/lifecycle#version-negotiation) to learn about the process for clients and servers to determine the version of the protocol being used. ### 2025-06-18 - Date: 2025-06-18 - Version: 2025-06-18 - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2025-06-18 - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2025-06-18 This release marks the initial 2025-06-18 revision of the Model Context Protocol. For a detailed overview of changes, see [2025-06-18 changelog](https://modelcontextprotocol.io/specification/2025-06-18/changelog). _To users and implementors:_ note that SDKs will adopt this version at their own pace, and the prior version of the spec may remain in use for an undetermined amount of time. The spec describes how clients and servers perform version negotiation with one another, permitting backwards and forwards compatibility. ### 2025-03-26 - Date: 2025-03-26 - Version: 2025-03-26 - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2025-03-26 - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2025-03-26 This release marks the initial 2025-03-26 revision of the Model Context Protocol. _To users and implementors:_ note that SDKs will adopt this version at their own pace, and the prior version of the spec may remain in use for an undetermined amount of time. The spec describes how clients and servers perform version negotiation with one another, permitting backwards and forwards compatibility. ### 2024-11-05-final - Date: 2025-03-26 - Version: 2024-11-05-final - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2024-11-05-final - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2024-11-05-final This release marks the final 2024-11-05 revision of the Model Context Protocol, including all backwards compatible changes made since [the initial 2024-11-05 release](https://github.com/modelcontextprotocol/specification/releases/tag/2024-11-05). ### 2024-11-05 - Date: 2025-01-17 - Version: 2024-11-05 - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2024-11-05 - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2024-11-05 This release marks the initial 2024-11-05 revision of the Model Context Protocol. ### 2024-10-07 - Date: 2024-11-06 - Version: 2024-10-07 - Original notes: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2024-10-07 - Permalink: https://whatsnew.fyi/product/model-context-protocol/releases/2024-10-07 Final update to version 2024-10-07 of the spec.