diff --git a/.speakeasy/in.openapi.yaml b/.speakeasy/in.openapi.yaml
index 4047ff2..c4a6011 100644
--- a/.speakeasy/in.openapi.yaml
+++ b/.speakeasy/in.openapi.yaml
@@ -6189,7 +6189,9 @@ components:
           type: string
         object:
           type: string
-          const: text_completion
+          enum:
+            - text_completion
+            - chat.completion
         created:
           type: number
         model:
diff --git a/tests/e2e/completions.test.ts b/tests/e2e/completions.test.ts
new file mode 100644
index 0000000..48dc64a
--- /dev/null
+++ b/tests/e2e/completions.test.ts
@@ -0,0 +1,35 @@
+import { beforeAll, describe, expect, it } from 'vitest';
+import { OpenRouter } from '../../src/sdk/sdk.js';
+
+describe('Completions E2E Tests', () => {
+  let client: OpenRouter;
+
+  beforeAll(() => {
+    const apiKey = process.env.OPENROUTER_API_KEY;
+    if (!apiKey) {
+      throw new Error('OPENROUTER_API_KEY environment variable is required for e2e tests');
+    }
+
+    client = new OpenRouter({
+      apiKey,
+    });
+  });
+
+  describe('completions.generate()', () => {
+    it('should successfully generate a text completion', async () => {
+      const response = await client.completions.generate({
+        model: 'meta-llama/llama-3.2-1b-instruct',
+        prompt: '5 + 7 = ',
+        maxTokens: 10,
+        stream: false,
+      });
+
+      expect(response).toBeDefined();
+      expect(response.id).toBeDefined();
+      // API returns chat.completion, SDK should accept both
+      expect(['text_completion', 'chat.completion']).toContain(response.object);
+      expect(Array.isArray(response.choices)).toBe(true);
+      expect(response.choices.length).toBeGreaterThan(0);
+    }, 30000);
+  });
+});