diff --git a/sgl-model-gateway/e2e_test/chat_completions/test_enable_thinking.py b/sgl-model-gateway/e2e_test/chat_completions/test_enable_thinking.py
new file mode 100644
index 000000000..79523268b
--- /dev/null
+++ b/sgl-model-gateway/e2e_test/chat_completions/test_enable_thinking.py
@@ -0,0 +1,168 @@
+"""Enable Thinking E2E Tests.
+
+Tests for chat completions with enable_thinking feature (Qwen3 reasoning).
+
+Source: Migrated from e2e_grpc/features/test_enable_thinking.py
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+
+import pytest
+import requests
+
+logger = logging.getLogger(__name__)
+
+# API key is not validated by the gateway, but required for OpenAI-compatible headers
+API_KEY = "not-used"
+
+
+# =============================================================================
+# Enable Thinking Tests (Qwen 30B)
+# =============================================================================
+
+
+@pytest.mark.model("qwen-30b")
+@pytest.mark.gateway(
+    extra_args=["--reasoning-parser", "qwen3", "--history-backend", "memory"]
+)
+@pytest.mark.parametrize("setup_backend", ["grpc"], indirect=True)
+class TestEnableThinking:
+    """Tests for enable_thinking feature with Qwen3 reasoning parser."""
+
+    def test_chat_completion_with_reasoning(self, setup_backend):
+        """Test non-streaming with enable_thinking=True, reasoning_content should not be empty."""
+        _, model, client, gateway = setup_backend
+
+        response = requests.post(
+            f"{gateway.base_url}/v1/chat/completions",
+            headers={"Authorization": f"Bearer {API_KEY}"},
+            json={
+                "model": model,
+                "messages": [{"role": "user", "content": "Hello"}],
+                "temperature": 0,
+                "separate_reasoning": True,
+                "chat_template_kwargs": {"enable_thinking": True},
+            },
+        )
+
+        assert response.status_code == 200, f"Failed with: {response.text}"
+        data = response.json()
+
+        assert "choices" in data
+        assert len(data["choices"]) > 0
+        assert "message" in data["choices"][0]
+        assert "reasoning_content" in data["choices"][0]["message"]
+        assert data["choices"][0]["message"]["reasoning_content"] is not None
+
+    def test_chat_completion_without_reasoning(self, setup_backend):
+        """Test non-streaming with enable_thinking=False, reasoning_content should be empty."""
+        _, model, client, gateway = setup_backend
+
+        response = requests.post(
+            f"{gateway.base_url}/v1/chat/completions",
+            headers={"Authorization": f"Bearer {API_KEY}"},
+            json={
+                "model": model,
+                "messages": [{"role": "user", "content": "Hello"}],
+                "temperature": 0,
+                "separate_reasoning": True,
+                "chat_template_kwargs": {"enable_thinking": False},
+            },
+        )
+
+        assert response.status_code == 200, f"Failed with: {response.text}"
+        data = response.json()
+
+        assert "choices" in data
+        assert len(data["choices"]) > 0
+        assert "message" in data["choices"][0]
+
+        if "reasoning_content" in data["choices"][0]["message"]:
+            assert data["choices"][0]["message"]["reasoning_content"] is None
+
+    def test_stream_chat_completion_with_reasoning(self, setup_backend):
+        """Test streaming with enable_thinking=True, reasoning_content should not be empty."""
+        _, model, client, gateway = setup_backend
+
+        response = requests.post(
+            f"{gateway.base_url}/v1/chat/completions",
+            headers={"Authorization": f"Bearer {API_KEY}"},
+            json={
+                "model": model,
+                "messages": [{"role": "user", "content": "Hello"}],
+                "temperature": 0,
+                "separate_reasoning": True,
+                "stream": True,
+                "chat_template_kwargs": {"enable_thinking": True},
+            },
+            stream=True,
+        )
+
+        assert response.status_code == 200, f"Failed with: {response.text}"
+
+        has_reasoning = False
+        has_content = False
+
+        for line in response.iter_lines():
+            if line:
+                line = line.decode("utf-8")
+                if line.startswith("data:") and not line.startswith("data: [DONE]"):
+                    data = json.loads(line[6:])
+                    if "choices" in data and len(data["choices"]) > 0:
+                        delta = data["choices"][0].get("delta", {})
+
+                        if "reasoning_content" in delta and delta["reasoning_content"]:
+                            has_reasoning = True
+
+                        if "content" in delta and delta["content"]:
+                            has_content = True
+
+        assert (
+            has_reasoning
+        ), "The reasoning content is not included in the stream response"
+        assert has_content, "The stream response does not contain normal content"
+
+    def test_stream_chat_completion_without_reasoning(self, setup_backend):
+        """Test streaming with enable_thinking=False, reasoning_content should be empty."""
+        _, model, client, gateway = setup_backend
+
+        response = requests.post(
+            f"{gateway.base_url}/v1/chat/completions",
+            headers={"Authorization": f"Bearer {API_KEY}"},
+            json={
+                "model": model,
+                "messages": [{"role": "user", "content": "Hello"}],
+                "temperature": 0,
+                "separate_reasoning": True,
+                "stream": True,
+                "chat_template_kwargs": {"enable_thinking": False},
+            },
+            stream=True,
+        )
+
+        assert response.status_code == 200, f"Failed with: {response.text}"
+
+        has_reasoning = False
+        has_content = False
+
+        for line in response.iter_lines():
+            if line:
+                line = line.decode("utf-8")
+                if line.startswith("data:") and not line.startswith("data: [DONE]"):
+                    data = json.loads(line[6:])
+                    if "choices" in data and len(data["choices"]) > 0:
+                        delta = data["choices"][0].get("delta", {})
+
+                        if "reasoning_content" in delta and delta["reasoning_content"]:
+                            has_reasoning = True
+
+                        if "content" in delta and delta["content"]:
+                            has_content = True
+
+        assert (
+            not has_reasoning
+        ), "The reasoning content should not be included in the stream response"
+        assert has_content, "The stream response does not contain normal content"
diff --git a/sgl-model-gateway/e2e_test/infra/model_specs.py b/sgl-model-gateway/e2e_test/infra/model_specs.py
index cb4417c6d..32ff0ef54 100644
--- a/sgl-model-gateway/e2e_test/infra/model_specs.py
+++ b/sgl-model-gateway/e2e_test/infra/model_specs.py
@@ -67,7 +67,7 @@ MODEL_SPECS: dict[str, dict] = {
     "qwen-30b": {
         "model": _resolve_model_path("Qwen/Qwen3-30B-A3B"),
         "memory_gb": 60,
-        "tp": 2,
+        "tp": 4,
         "features": ["chat", "streaming", "thinking", "reasoning"],
     },
     # Mistral for function calling