diff --git a/test/is-gpt4-model.test.ts b/test/is-gpt4-model.test.ts
new file mode 100644
index 00000000000..80f42b3c576
--- /dev/null
+++ b/test/is-gpt4-model.test.ts
@@ -0,0 +1,21 @@
+import { isGPT4Model } from "../app/utils/model";
+
+describe("isGPT4Model", () => {
+  test("matches the gpt-4, chatgpt-4o and o1 families", () => {
+    expect(isGPT4Model("gpt-4")).toBe(true);
+    expect(isGPT4Model("gpt-4-turbo")).toBe(true);
+    expect(isGPT4Model("gpt-4o")).toBe(true);
+    expect(isGPT4Model("chatgpt-4o-latest")).toBe(true);
+    expect(isGPT4Model("o1-preview")).toBe(true);
+  });
+
+  test("excludes gpt-4o-mini", () => {
+    expect(isGPT4Model("gpt-4o-mini")).toBe(false);
+  });
+
+  test("does not match non-gpt-4 models", () => {
+    expect(isGPT4Model("gpt-3.5-turbo")).toBe(false);
+    expect(isGPT4Model("o3-mini")).toBe(false);
+    expect(isGPT4Model("claude-3-opus")).toBe(false);
+  });
+});