diff --git a/home-manager/progs/opencode.nix b/home-manager/progs/opencode.nix
index 7c9f53f..282f399 100644
--- a/home-manager/progs/opencode.nix
+++ b/home-manager/progs/opencode.nix
@@ -24,7 +24,7 @@
       ## Behavior
       Do not be sycophantic in your responses.
       Do not use emojis unless explicitly asked to. This includes in code.
-      ALWAYS test code before returning to the user with something you think works. Always verify your work.
+      Use Test Driven Development methodology.
 
       ## Nix
       For using `nix build` append `-L` to get better visibility into the logs.
@@ -39,8 +39,7 @@
 
       autoshare = false;
       autoupdate = true;
-      agent = {
-      };
+      agent = { };
       provider = {
         openrouter = {
           models = {
@@ -52,6 +51,17 @@
             apiKey = "{file:${../secrets/openrouter_api_key}}";
           };
         };
+        # Local llama-cpp server with OpenAI-compatible API
+        "llama.cpp" = {
+          npm = "@ai-sdk/openai-compatible";
+          options = {
+            baseURL = "http://127.0.0.1:8012/v1";
+          };
+
+          models = {
+            "local" = { };
+          };
+        };
       };
     };
   };
diff --git a/system/common.nix b/system/common.nix
index c9756e4..06038ca 100644
--- a/system/common.nix
+++ b/system/common.nix
@@ -15,6 +15,7 @@
     # ./vm.nix
     ./steam.nix
     ./networking.nix
+    ./llama-cpp.nix
 
     inputs.disko.nixosModules.disko
     inputs.lanzaboote.nixosModules.lanzaboote
diff --git a/system/llama-cpp.nix b/system/llama-cpp.nix
new file mode 100644
index 0000000..dcd9b5a
--- /dev/null
+++ b/system/llama-cpp.nix
@@ -0,0 +1,60 @@
+{
+  config,
+  pkgs,
+  lib,
+  hostname,
+  inputs,
+  ...
+}:
+let
+  # stolen from: https://stackoverflow.com/a/42398526
+  optimizeWithFlags =
+    pkg: flags:
+    lib.overrideDerivation pkg (
+      old:
+      let
+        newflags = lib.foldl' (acc: x: "${acc} ${x}") "" flags;
+        oldflags = if (lib.hasAttr "NIX_CFLAGS_COMPILE" old) then "${old.NIX_CFLAGS_COMPILE}" else "";
+      in
+      {
+        NIX_CFLAGS_COMPILE = "${oldflags} ${newflags}";
+        # stdenv = pkgs.clang19Stdenv;
+      }
+    );
+
+  optimizePackage =
+    pkg:
+    optimizeWithFlags pkg [
+      "-O3"
+      "-march=znver5"
+      "-mtune=znver5"
+    ];
+in
+{
+  services.llama-cpp = {
+    enable = true;
+    model = pkgs.fetchurl {
+      url = "https://huggingface.co/bartowski/Nanbeige_Nanbeige4-3B-Thinking-2511-GGUF/resolve/main/Nanbeige_Nanbeige4-3B-Thinking-2511-IQ4_NL.gguf";
+      sha256 = "c49cd4652cffc3da91986ac2c3dccdf9ab19afe007445f30fe83001eb29b44cf";
+    };
+
+    host = "127.0.0.1";
+    port = 8012;
+    package = pkgs.llama-cpp.override { vulkanSupport = true; };
+
+    extraFlags = [
+      # Context size
+      "-c"
+      "32768"
+
+      "-ngl"
+      "99"
+
+      "--alias"
+      "local"
+    ];
+  };
+
+  # have to do this in order to get vulkan to work
+  systemd.services.llama-cpp.serviceConfig.DynamicUser = lib.mkForce false;
+}