am I on nixos-unstable?

new to nixos. I have found a flake.nix file on the internet which I used to build my system. in that flake file I found the following line: { inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; antigravity-nix = { url = "github:jacopone/antigravity-nix"; inputs.nixpkgs.follows = "nixpkgs"; }; }; outputs = { self, nixpkgs, antigravity-nix, ... }: { nixosConfigurations.your-hostname = nixpkgs.lib.nixosSystem { system = "x86_64-linux"; modules = [ ./configuration.nix ./hardware-configuration.nix { environment.systemPackages = [ antigravity-nix.packages.x86_64-linux.default # Base App antigravity-nix.packages.x86_64-linux.google-antigravity-ide # IDE antigravity-nix.packages.x86_64-linux.google-antigravity-cli # CLI ]; } ]; }; }; } if I understood correctly the flake also has outputs variable in the attribute set and it’s returning nixpkgs whose url is set to the unstable. does it mean I am running unstable version of nixos? Thanks in advance!