: This seems to denote a specific version of Garry's Mod, with "16" possibly referring to the year (2016) and "1201" to the date (December 1st). Version numbers can vary in format, but this seems to imply a release or update on December 1st, 2016.
Garry’s Mod is essentially a "platform" rather than just a game. If you are running an outdated version, you lose access to: : This seems to denote a specific version
Stay current with the latest patches and security fixes automatically. Multi-Language Support: If you are running an outdated version, you
Modern creators use the latest Lua functions which are not present in older versions of the game. episodes are now included by default, so users
However, if you only play the newest gamemodes (like the 2025 versions of Prop Hunt) or want official Linux dedicated server support, you should stick to the Steam main branch.
episodes are now included by default, so users no longer need to own those games to view most community map content. Summary of Official Release Info Official Details Current Major Version Last Record Update April 14, 2026 Facepunch Studios Windows, macOS, Linux Official Store Garry's Mod on Steam
