diff --git a/flake.nix b/flake.nix
index 9b6025f..249d20b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -46,6 +46,7 @@
           hostname: let
             syncthingOverlay = import ./overlays/syncthing-darwin.nix;
             syncthingModule = (syncthingOverlay null {}).darwinSyncthingModule;
+            opencodeOverlay = import ./overlays/opencode.nix;
           in
             inputs.darwin.lib.darwinSystem {
               system = "aarch64-darwin";
@@ -60,7 +61,7 @@
                 syncthingModule
 
                 {
-                  nixpkgs.overlays = [syncthingOverlay];
+                  nixpkgs.overlays = [syncthingOverlay opencodeOverlay];
 
                   nix-homebrew = {
                     inherit user;
@@ -79,7 +80,9 @@
         );
 
         flake.nixosConfigurations = inputs.nixpkgs.lib.genAttrs nixosHosts (
-          hostname:
+          hostname: let
+            opencodeOverlay = import ./overlays/opencode.nix;
+          in
             inputs.nixpkgs.lib.nixosSystem {
               system = "x86_64-linux";
               specialArgs =
@@ -89,6 +92,9 @@
                 };
               modules = [
                 inputs.home-manager.nixosModules.home-manager
+                {
+                  nixpkgs.overlays = [opencodeOverlay];
+                }
                 ./hosts/nixos/${hostname}
               ];
             }
diff --git a/modules/nixos/default.nix b/modules/nixos/default.nix
index 5ab441d..9917f6f 100644
--- a/modules/nixos/default.nix
+++ b/modules/nixos/default.nix
@@ -48,6 +48,7 @@
   };
 
   home-manager = {
+    useGlobalPkgs = true;
     users.${user} = {
       pkgs,
       config,
diff --git a/modules/packages.nix b/modules/packages.nix
index d55cbaf..b448acf 100644
--- a/modules/packages.nix
+++ b/modules/packages.nix
@@ -2,6 +2,7 @@
 with pkgs; [
   (callPackage ./bin/open-project.nix {})
   age
+  lsof
   alejandra
   delta
   docker
diff --git a/overlays/opencode.nix b/overlays/opencode.nix
new file mode 100644
index 0000000..5978b12
--- /dev/null
+++ b/overlays/opencode.nix
@@ -0,0 +1,108 @@
+final: prev: {
+  opencode = prev.opencode.overrideAttrs (oldAttrs: rec {
+    version = "0.5.12";
+
+    src = prev.fetchFromGitHub {
+      owner = "sst";
+      repo = "opencode";
+      tag = "v${version}";
+      hash = "sha256-iPv6rATpIpf2j81Ud4OSWOt0ZSR0sAYBhBRrQpOH1Bs=";
+    };
+
+    tui = prev.buildGoModule {
+      pname = "opencode-tui";
+      inherit version src;
+      modRoot = "packages/tui";
+      vendorHash = "sha256-acDXCL7ZQYW5LnEqbMgDwpTbSgtf4wXnMMVtQI1Dv9s=";
+      subPackages = ["cmd/opencode"];
+
+      env.CGO_ENABLED = 0;
+
+      ldflags = [
+        "-s"
+        "-X=main.Version=${version}"
+      ];
+
+      installPhase = ''
+        runHook preInstall
+        install -Dm755 $GOPATH/bin/opencode $out/bin/tui
+        runHook postInstall
+      '';
+    };
+
+    node_modules = prev.stdenvNoCC.mkDerivation {
+      pname = "opencode-node_modules";
+      inherit version src;
+
+      impureEnvVars =
+        prev.lib.fetchers.proxyImpureEnvVars
+        ++ [
+          "GIT_PROXY_COMMAND"
+          "SOCKS_SERVER"
+        ];
+
+      nativeBuildInputs = [
+        prev.bun
+        prev.writableTmpDirAsHomeHook
+      ];
+
+      dontConfigure = true;
+
+      buildPhase = ''
+        runHook preBuild
+
+        export BUN_INSTALL_CACHE_DIR=$(mktemp -d)
+
+        # Disable post-install scripts to avoid shebang issues
+        bun install \
+          --filter=opencode \
+          --force \
+          --frozen-lockfile \
+          --ignore-scripts \
+          --no-progress \
+          --production
+
+        runHook postBuild
+      '';
+
+      installPhase = ''
+        runHook preInstall
+
+        mkdir -p $out/node_modules
+        cp -R ./node_modules $out
+
+        runHook postInstall
+      '';
+
+      dontFixup = true;
+
+      outputHash = "sha256-hznCg/7c9uNV7NXTkb6wtn3EhJDkGI7yZmSIA2SqX7g=";
+      outputHashAlgo = "sha256";
+      outputHashMode = "recursive";
+    };
+
+    buildPhase = ''
+      runHook preBuild
+
+      bun build \
+        --define OPENCODE_TUI_PATH="'${oldAttrs.tui}/bin/tui'" \
+        --define OPENCODE_VERSION="'${version}'" \
+        --compile \
+        --target=${
+        {
+          "aarch64-darwin" = "bun-darwin-arm64";
+          "aarch64-linux" = "bun-linux-arm64";
+          "x86_64-darwin" = "bun-darwin-x64";
+          "x86_64-linux" = "bun-linux-x64";
+        }.${
+          prev.stdenvNoCC.hostPlatform.system
+        }
+      } \
+        --outfile=opencode \
+        ./packages/opencode/src/index.ts \
+
+      runHook postBuild
+    '';
+  });
+}
+