The headline changes in this release are related to the Python plugin host:

- Upgraded Python 3.8 to Python 3.14

- Python 3.3 is now disabled by default

By default, Sublime plugins now all run under the Python 3.14. The 3.8 plugin host was removed (Python 3.8 reached EOL in Oct 2024), and the 3.3 plugin host is deprecated, and will be removed in a future release.

This is great for plugin devs. They get improvements to syntax, performance, type hints, the standard library, etc, and they can depend on modern versions of Python packages. Many packages no longer receive updates for 3.8 (e.g. https://github.com/psf/requests), let alone 3.3, and many others simply don't run on these older python versions (e.g. https://github.com/xberg-io/tree-sitter-language-pack).

Like the plugin systems for Emacs/Neovim/VS Code (and unlike the sandboxed systems for e.g. Zed and Helix), Sublime's plugin API has low-level access to the editor, and the runtime has full OS access.

I think Sublime was smart to bet on Python for the plugin system. They released the plugin system in 2009, before Python was everywhere. The super flexible plugin API and the huge package ecosystem is a powerful combo.