diff --git a/nixos/doc/manual/release-notes/rl-2611.section.md b/nixos/doc/manual/release-notes/rl-2611.section.md
index 0bd05ef80140..8bc0d52dcaf5 100644
--- a/nixos/doc/manual/release-notes/rl-2611.section.md
+++ b/nixos/doc/manual/release-notes/rl-2611.section.md
@@ -144,6 +144,8 @@
 
 - [Netbird Relay](https://netbird.io/), a module to relay traffic when a point-to-point connection is not possible.
 
+- [ollaya](https://ollaya.dev), a server for local decision models, with an Ollama-style CLI and a TypeSafe-compatible API. Available as [services.ollaya](#opt-services.ollaya.enable).
+
 ## Backward Incompatibilities {#sec-release-26.11-incompatibilities}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 141722e2e2d7..fef459fe7e89 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -959,6 +959,7 @@
   ./services/misc/nzbhydra2.nix
   ./services/misc/octoprint.nix
   ./services/misc/ollama.nix
+  ./services/misc/ollaya.nix
   ./services/misc/ombi.nix
   ./services/misc/omnom.nix
   ./services/misc/open-webui.nix
diff --git a/nixos/modules/services/misc/ollaya.nix b/nixos/modules/services/misc/ollaya.nix
new file mode 100644
index 000000000000..b242a2e36ab1
--- /dev/null
+++ b/nixos/modules/services/misc/ollaya.nix
@@ -0,0 +1,228 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  inherit (lib) literalExpression types;
+
+  cfg = config.services.ollaya;
+  ollaya = lib.getExe cfg.package;
+
+  staticUser = cfg.user != null && cfg.group != null;
+in
+{
+  options.services.ollaya = {
+    enable = lib.mkEnableOption "ollaya server for local decision models";
+
+    package = lib.mkPackageOption pkgs "ollaya" { };
+
+    user = lib.mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      example = "ollaya";
+      description = ''
+        User account under which to run ollaya. Defaults to
+        [`DynamicUser`](https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html#DynamicUser=)
+        when set to `null`.
+
+        The user will automatically be created when this option is non-null.
+      '';
+    };
+
+    group = lib.mkOption {
+      type = types.nullOr types.str;
+      default = cfg.user;
+      defaultText = literalExpression "config.services.ollaya.user";
+      example = "ollaya";
+      description = ''
+        Group under which to run ollaya. Only used when `services.ollaya.user` is set.
+      '';
+    };
+
+    home = lib.mkOption {
+      type = types.str;
+      default = "/var/lib/ollaya";
+      example = "/home/foo";
+      description = "The home directory that the ollaya service is started in.";
+    };
+
+    modelsDir = lib.mkOption {
+      type = types.str;
+      default = "${cfg.home}/models";
+      defaultText = literalExpression "\${config.services.ollaya.home}/models";
+      example = "/path/to/ollaya/models";
+      description = ''
+        Directory where ollaya reads and stores downloaded models.
+      '';
+    };
+
+    host = lib.mkOption {
+      type = types.str;
+      default = "127.0.0.1";
+      example = "0.0.0.0";
+      description = "IP address on which the server listens.";
+    };
+
+    port = lib.mkOption {
+      type = types.port;
+      default = 11435;
+      example = 11111;
+      description = "Port on which the server listens.";
+    };
+
+    settings = lib.mkOption {
+      type = types.submodule { freeformType = types.attrsOf types.str; };
+      default = { };
+      example = {
+        OLLAYA_DEVICE = "cuda";
+        OLLAYA_KEEP_ALIVE = "30m";
+      };
+      description = ''
+        Environment variables passed to the ollaya server process.
+        See <https://ollaya.dev/docs/cli#ollaya-serve> for available variables.
+      '';
+    };
+
+    loadModels = lib.mkOption {
+      type = types.listOf types.str;
+      apply = builtins.filter (model: model != "");
+      default = [ ];
+      example = [ "winnow:e4b" ];
+      description = ''
+        Models to download after the ollaya service starts. This creates a
+        separate `ollaya-model-loader.service`.
+      '';
+    };
+
+    openFirewall = lib.mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to open the firewall for ollaya. This adds
+        `services.ollaya.port` to `networking.firewall.allowedTCPPorts`.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    users = lib.mkIf staticUser {
+      users.${cfg.user} = {
+        inherit (cfg) home;
+        isSystemUser = true;
+        group = cfg.group;
+      };
+      groups.${cfg.group} = { };
+    };
+
+    systemd.services.ollaya = {
+      description = "Server for local decision models";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      environment = cfg.settings // {
+        HOME = cfg.home;
+        OLLAYA_MODELS = cfg.modelsDir;
+        OLLAYA_HOST = "${cfg.host}:${toString cfg.port}";
+      };
+      serviceConfig =
+        lib.optionalAttrs staticUser {
+          User = cfg.user;
+          Group = cfg.group;
+        }
+        // {
+          Type = "exec";
+          DynamicUser = true;
+          ExecStart = "${ollaya} serve";
+          WorkingDirectory = cfg.home;
+          StateDirectory = [ "ollaya" ];
+          ReadWritePaths = [
+            cfg.home
+            cfg.modelsDir
+          ];
+
+          CapabilityBoundingSet = [ "" ];
+          DeviceAllow = [
+            "char-nvidiactl"
+            "char-nvidia-caps"
+            "char-nvidia-frontend"
+            "char-nvidia-uvm"
+            "char-drm"
+            "char-fb"
+            "char-kfd"
+            "/dev/dxg"
+          ];
+          DevicePolicy = "closed";
+          LockPersonality = true;
+          MemoryDenyWriteExecute = true;
+          NoNewPrivileges = true;
+          PrivateDevices = false;
+          PrivateTmp = true;
+          PrivateUsers = true;
+          ProcSubset = "all";
+          ProtectClock = true;
+          ProtectControlGroups = true;
+          ProtectHome = true;
+          ProtectHostname = true;
+          ProtectKernelLogs = true;
+          ProtectKernelModules = true;
+          ProtectKernelTunables = true;
+          ProtectProc = "invisible";
+          ProtectSystem = "strict";
+          RemoveIPC = true;
+          RestrictNamespaces = true;
+          RestrictRealtime = true;
+          RestrictSUIDSGID = true;
+          RestrictAddressFamilies = [
+            "AF_INET"
+            "AF_INET6"
+            "AF_UNIX"
+          ];
+          SupplementaryGroups = [ "render" ];
+          SystemCallArchitectures = "native";
+          SystemCallFilter = [
+            "@system-service @resources"
+            "~@privileged"
+          ];
+          UMask = "0077";
+        };
+    };
+
+    systemd.services.ollaya-model-loader = lib.mkIf (cfg.loadModels != [ ]) {
+      description = "Download ollaya models in the background";
+      wantedBy = [
+        "multi-user.target"
+        "ollaya.service"
+      ];
+      wants = [ "network-online.target" ];
+      after = [
+        "ollaya.service"
+        "network-online.target"
+      ];
+      bindsTo = [ "ollaya.service" ];
+      environment = config.systemd.services.ollaya.environment;
+      serviceConfig = {
+        Type = "exec";
+        DynamicUser = true;
+        Restart = "on-failure";
+        RestartSec = "1s";
+        RestartMaxDelaySec = "2h";
+        RestartSteps = "10";
+      };
+      script =
+        let
+          nproc = lib.getExe' pkgs.coreutils "nproc";
+          xargs = lib.getExe' pkgs.findutils "xargs";
+        in
+        ''
+          printf "%s\0" ${lib.escapeShellArgs cfg.loadModels} | '${xargs}' -0 -r -n 1 -P "$('${nproc}')" '${ollaya}' pull
+        '';
+    };
+
+    networking.firewall.allowedTCPPorts = lib.optional cfg.openFirewall cfg.port;
+
+    environment.systemPackages = [ cfg.package ];
+  };
+
+  meta.maintainers = with lib.maintainers; [ happysalada ];
+}
diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index dd6c90ee9648..a446bad2b517 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -1377,6 +1377,7 @@ in
   ollama-cuda = runTestOn [ "x86_64-linux" "aarch64-linux" ] ./ollama-cuda.nix;
   ollama-rocm = runTestOn [ "x86_64-linux" "aarch64-linux" ] ./ollama-rocm.nix;
   ollama-vulkan = runTestOn [ "x86_64-linux" "aarch64-linux" ] ./ollama-vulkan.nix;
+  ollaya = runTest ./ollaya.nix;
   omada = runTestOn [ "x86_64-linux" ] ./omada.nix;
   ombi = runTest ./ombi.nix;
   omnom = runTest ./omnom;
diff --git a/nixos/tests/ollaya.nix b/nixos/tests/ollaya.nix
new file mode 100644
index 000000000000..762c53af2f8e
--- /dev/null
+++ b/nixos/tests/ollaya.nix
@@ -0,0 +1,44 @@
+{ lib, ... }:
+
+let
+  port = 11435;
+  apiKey = "ollaya-test-key";
+in
+{
+  name = "ollaya";
+  meta.maintainers = with lib.maintainers; [ happysalada ];
+
+  nodes.machine =
+    { ... }:
+    {
+      services.ollaya = {
+        enable = true;
+        inherit port;
+        settings.OLLAYA_API_KEY = apiKey;
+      };
+    };
+
+  testScript = ''
+    import json
+
+    machine.wait_for_unit("ollaya.service")
+    machine.wait_for_open_port(${toString port})
+
+    # `GET /` is the liveness endpoint and the only one that takes no API key.
+    assert "Ollaya is running" in machine.succeed(
+        "curl --fail http://127.0.0.1:${toString port}/"
+    )
+
+    # `services.ollaya.settings` reaches the server: the API refuses a request
+    # without the key, and answers the model list with it.
+    status = machine.succeed(
+        "curl -so /dev/null -w '%{http_code}' http://127.0.0.1:${toString port}/api/tags"
+    )
+    assert status == "401", status
+
+    tags = machine.succeed(
+        "curl --fail -H 'Authorization: Bearer ${apiKey}' http://127.0.0.1:${toString port}/api/tags"
+    )
+    assert json.loads(tags)["models"] == [], tags
+  '';
+}