diff --git a/src/index.ts b/src/index.ts
index a9f0233..5a4554c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -10,14 +10,12 @@ export class ModelInfo {
 }
 
 export interface ModelFactory {
-  getModel<T extends Model<object, object>>(modelName: string): T;
+  getModel<T extends Model>(modelName: string): T;
 }
 
-export abstract class Model<TInput extends object, TOutput extends object> {
-  protected constructor(
-    public readonly info: ModelInfo,
-    protected invoker: ModelInvoker,
-  ) {}
+export abstract class Model<TInput = unknown, TOutput = unknown> {
+  static invoker: ModelInvoker | null = null;
+  protected constructor(public info: ModelInfo) {}
 
   debug: boolean = false;
 
@@ -27,13 +25,17 @@ export abstract class Model<TInput extends object, TOutput extends object> {
    * @returns The output object from the model.
    */
   invoke(input: TInput): TOutput {
+    if (!Model.invoker) {
+      throw new Error("Model invoker is not set.");
+    }
+
     const modelName = this.info.name;
     const inputJson = JSON.stringify(input);
     if (this.debug) {
       console.debug(`Invoking ${modelName} model with input: ${inputJson}`);
     }
 
-    const outputJson = this.invoker(modelName, inputJson);
+    const outputJson = Model.invoker(modelName, inputJson);
     if (!outputJson) {
       throw new Error(`Failed to invoke ${modelName} model.`);
     }
diff --git a/src/package-lock.json b/src/package-lock.json
index c5139fe..1f1a84d 100644
--- a/src/package-lock.json
+++ b/src/package-lock.json
@@ -1,18 +1,18 @@
 {
   "name": "@hypermode/models-as",
-  "version": "0.1.2",
+  "version": "0.1.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@hypermode/models-as",
-      "version": "0.1.2",
+      "version": "0.1.5",
       "license": "MIT",
       "dependencies": {
         "json-as": "^0.9.6"
       },
       "devDependencies": {
-        "@types/node": "^20.14.4",
+        "@types/node": "^20.14.5",
         "@typescript-eslint/eslint-plugin": "^7.13.1",
         "@typescript-eslint/parser": "^7.13.1",
         "assemblyscript": "^0.27.27",
@@ -208,9 +208,9 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "20.14.4",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.14.4.tgz",
-      "integrity": "sha512-1ChboN+57suCT2t/f8lwtPY/k3qTpuD/qnqQuYoBg6OQOcPyaw7PiZVdGpaZYAvhDDtqrt0oAaM8+oSu1xsUGw==",
+      "version": "20.14.5",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.14.5.tgz",
+      "integrity": "sha512-aoRR+fJkZT2l0aGOJhuA8frnCSoNX6W7U2mpNq63+BxBIj5BQFt8rHy627kijCmm63ijdSdwvGgpUsU6MBsZZA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/src/package.json b/src/package.json
index 725d36c..d0fc135 100644
--- a/src/package.json
+++ b/src/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hypermode/models-as",
-  "version": "0.1.2",
+  "version": "0.1.5",
   "description": "Hypermode Model Interface Library for AssemblyScript",
   "author": "Hypermode, Inc.",
   "license": "MIT",
@@ -17,7 +17,7 @@
     "json-as": "^0.9.6"
   },
   "devDependencies": {
-    "@types/node": "^20.14.4",
+    "@types/node": "^20.14.5",
     "@typescript-eslint/eslint-plugin": "^7.13.1",
     "@typescript-eslint/parser": "^7.13.1",
     "assemblyscript": "^0.27.27",