diff --git a/test/registered/amd/disaggregation/test_disaggregation_basic.py b/test/registered/amd/disaggregation/test_disaggregation_basic.py
index 8e00d2ba1..ece633fe8 100644
--- a/test/registered/amd/disaggregation/test_disaggregation_basic.py
+++ b/test/registered/amd/disaggregation/test_disaggregation_basic.py
@@ -13,7 +13,6 @@ from sglang.test.server_fixtures.disaggregation_fixture import (
     PDDisaggregationServerBase,
 )
 from sglang.test.test_utils import (
-    DEFAULT_MODEL_NAME_FOR_TEST,
     DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
     popen_launch_pd_server,
 )
@@ -36,7 +35,7 @@ class TestDisaggregationAccuracy(PDDisaggregationServerBase):
             print("SGLANG_TEST_RDMA_DEVICE is not set! Running without RDMA.")
             cls.rdma_devices = []
 
-        cls.model = DEFAULT_MODEL_NAME_FOR_TEST
+        cls.model = "Qwen/Qwen3-8B"
         # DEFAULT_MODEL_NAME_FOR_TEST
 
         # Non blocking start servers
@@ -235,7 +234,7 @@ class TestDisaggregationMooncakeFailure(PDDisaggregationServerBase):
         # set DISAGGREGATION_TEST_FAILURE_PROB to simulate failure
         os.environ["DISAGGREGATION_TEST_FAILURE_PROB"] = "0.05"
 
-        cls.model = DEFAULT_MODEL_NAME_FOR_TEST
+        cls.model = "Qwen/Qwen3-8B"
 
         # Non blocking start servers
         cls.start_prefill()
@@ -347,7 +346,7 @@ class TestDisaggregationSimulatedRetract(PDDisaggregationServerBase):
             cls.rdma_devices = []
 
         os.environ["SGLANG_TEST_RETRACT"] = "true"
-        cls.model = DEFAULT_MODEL_NAME_FOR_TEST
+        cls.model = "Qwen/Qwen3-8B"
 
         # Non blocking start servers
         cls.start_prefill()
diff --git a/test/registered/amd/disaggregation/test_disaggregation_pp.py b/test/registered/amd/disaggregation/test_disaggregation_pp.py
index 7f0d9ca87..a817ae78b 100644
--- a/test/registered/amd/disaggregation/test_disaggregation_pp.py
+++ b/test/registered/amd/disaggregation/test_disaggregation_pp.py
@@ -9,7 +9,6 @@ from sglang.test.server_fixtures.disaggregation_fixture import (
     PDDisaggregationServerBase,
 )
 from sglang.test.test_utils import (
-    DEFAULT_MODEL_NAME_FOR_TEST,
     DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
     popen_launch_pd_server,
     try_cached_model,
@@ -33,7 +32,7 @@ class TestDisaggregationPrefillPPAccuracy(PDDisaggregationServerBase):
             print("SGLANG_TEST_RDMA_DEVICE is not set! Running without RDMA.")
             cls.rdma_devices = []
 
-        cls.model = try_cached_model(DEFAULT_MODEL_NAME_FOR_TEST)
+        cls.model = try_cached_model("Qwen/Qwen3-8B")
 
         # Non blocking start servers
         cls.start_prefill()
@@ -126,7 +125,7 @@ class TestDisaggregationPrefillPPDynamicChunkAccuracy(PDDisaggregationServerBase
             print("SGLANG_TEST_RDMA_DEVICE is not set! Running without RDMA.")
             cls.rdma_devices = []
 
-        cls.model = try_cached_model(DEFAULT_MODEL_NAME_FOR_TEST)
+        cls.model = try_cached_model("Qwen/Qwen3-8B")
 
         # Non blocking start servers
         cls.start_prefill()
@@ -220,7 +219,7 @@ class TestDisaggregationDecodePPAccuracy(PDDisaggregationServerBase):
             print("SGLANG_TEST_RDMA_DEVICE is not set! Running without RDMA.")
             cls.rdma_devices = []
 
-        cls.model = try_cached_model(DEFAULT_MODEL_NAME_FOR_TEST)
+        cls.model = try_cached_model("Qwen/Qwen3-8B")
 
         # Non blocking start servers
         cls.start_prefill()