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+Project: /youtube/cobalt/_project.yaml
+Book: /youtube/cobalt/_book.yaml
+
+## Cobalt 25.LTS.10 Stable Release
+
+The Cobalt team is thrilled to announce the stable release of **Cobalt 25 LTS
+([25.lts.10.1034827](https://github.com/youtube/cobalt/tree/25.lts.10))**
+
+The Evergreen binaries are available on GitHub
+([5.10.2](https://github.com/youtube/cobalt/releases/tag/25.lts.10))
+
+Cobalt 25 LTS includes **Starboard API version 16** for porters and this stable
+release version supports all features that are required for **2025 YouTube
+Certification**. The code is available at Cobalt open source
+**[25.lts.10](https://github.com/youtube/cobalt/tree/25.lts.10)** branch.
+(Read
+[branching](https://github.com/youtube/cobalt/blob/25.lts.10/cobalt/site/docs/gen/cobalt/doc/branching.md)
+and
+[versioning](https://github.com/youtube/cobalt/blob/25.lts.10/cobalt/site/docs/gen/cobalt/doc/versioning.md)
+documents for more information)
+
+There are newly implemented features, improvements, and simplified code. We have
+outlined the changelist with a brief description of **Cobalt 25 LTS** and
+**Starboard 16** changes.
+
+### Cobalt Changes
+
+(see[
+cobalt/CHANGELOG.md](https://github.com/youtube/cobalt/blob/25.lts.10/cobalt/CHANGELOG.md)
+for more information)
+
+#### New Features / Support
+
+*   **Chromium M114 Update:** Upgraded most Chromium components to align with
+    the M114 milestone release - including syncing the build environment and
+    compilers.
+*   **HTTP/3 with IETF QUIC:** Integrated HTTP/3 with IETF standard QUIC for
+    enhanced video playback performance in challenging network conditions.
+*   **Immersive Audio Model and Formats (IAMF):** Added support for IAMF audio.
+*   **Android U Support:** Extended compatibility to Android U
+
+#### Updates / Improvements
+
+*   **Embedded ICU Data:** Linked ICU data directly into the Cobalt binary,
+    reducing storage (via binary compression) and simplifying updates.
+*   **Logging and Telemetry Enhancements:** Improved logging and telemetry for
+    update reliability and crash reporting.
+*   **Critical Stability fixes** : Bug fixes and stability
+    [improvements](https://github.com/youtube/cobalt/compare/25.lts.1...25.lts.10).
+
+#### Evergreen
+
+*   **LZ4 Compressed Binaries:** Made LZ4 compressed binaries the default
+    distribution format.
+*   **Evergreen-Full on AOSP:** Enabled Evergreen-Full support on AOSP (Android
+    Open Source).
+
+### Starboard Changes
+
+(see
+[starboard/CHANGELOG.md](https://github.com/youtube/cobalt/blob/25.lts.10/starboard/CHANGELOG.md)
+for more information)
+
+#### New Features / Support
+
+*   **POSIX API Adoption:** Adopted POSIX APIs (see [migration
+    guide](https://github.com/youtube/cobalt/blob/25.lts.10/starboard/doc/starboard_16_posix.md)
+    for details), reducing the total number of Starboard interface functions to
+    191 (vs 274 in Starboard 15).
+*   **Partial Audio Frame Support:** Introduced a new configuration constant
+    (kHasPartialAudioFramesSupport) for partial audio frames.
+
+#### Updates / Improvements
+
+*   **pthread Migration:** Migrated various components (e.g.,`
+    SbConditionVariable`, `SbOnce`, `SbThreadLocalKey`, etc) to pthread.
+*   **Memory and File System Migration:** Migrated memory allocation functions
+    (`SbMemoryAllocate`, `SbMemoryMap` and others) to `malloc`, `mmap` and file
+    system functions (`SbDirectoryOpen`, `SbDirectoryClose` and others) to
+    equivalent `opendir`, `closedir`.
+*   **Socket API Migration:** Migrated `SbSocket` to socket APIs.
+*   **Starboard Extensions : `Accessibility`** and `onScreenKeyboard` Starboard
+    APIs are converted to Starboard Extensions (available in`
+    starboard/extension/accessibility.h `and
+    `starboard/extension/on_screen_keyboard.h` respectively).
+*   **Build Standard Upgrade:** Upgraded the C build standard to C11.
+    *   Removed `SB_C_NOINLINE`.
+    *   Deprecated `SB_C_INLINE` and removed config for `SB_C_FORCE_INLINE`.
+    *   Removed configs for `SB_EXPORT_PLATFORM` and `SB_IMPORT_PLATFORM`.
+*   **Configuration Changes:**
+    *   Changed `MAP_EXECUTABLE_MEMORY` from build-time to runtime config
+        (`kSbCanMapExecutableMemory`).
+*   **Additional Migrations:** Migrated `SbDirectoryCanOpen`, `SbFileExists`,
+    and `SbFileGetPathInfo` to `start` , and `SbFileOpen`, `SbFileClose` to
+    `open`, `close`.
+
+#### Deprecations
+
+*   **Deprecated Evergreen-x86 ABI:** The x86 platform configurations, builds
+    and ABI are no longer supported for Evergreen.
+*   **OnScreenKeyboard:** Deprecated OnScreenKeyboard.
+*   **Unused Configurations:** Deprecated various unused configurations (e.g.,
+    `B_HAS_GLES2`, `SB_HAS_NV12_TEXTURE_SUPPORT`, `VIRTUAL_REALITY`,
+    `DeployPathPatterns`, `SPEECH_SYNTHESIS`, `FILESYSTEM_ZERO_FILEINFO_TIME`,
+    `SB_HAS_PIPE`).
+*   **Audio and Media:**
+    *   Deprecated SB_HAS_QUIRK(SUPPORT_INT16_AUDIO_SAMPLES).
+    *   Deprecated `SbMediaGetBufferAlignment`, `SbMediaGetBufferPadding` and
+        `SbMediaGetBufferStorageType`.
+    *   Deprecated `SbMediaIsBufferUsingMemoryPool`, and memory pool is always
+        used. (`SbMediaIsBufferUsingMemoryPool` is required to be true)
+*   **Starboard Hash Configs:** Deprecated Starboard hash configs.
+
+### 2025 YouTube Certification
+
+Remember to use "_25.lts.10_" for the 2025 YouTube certification and for your
+product release. Cobalt Known Issues with Status, Fixes, and Mitigations can be
+found in the [YouTube Partner
+Portal](https://developers.google.com/youtube/devices/living-room/support/cobalt-known-issues).
+
+### Contact Points
+
+Contact our [support channels](https://cobalt.dev/communication.html) if
+you have any problems, questions, or feedback.