diff --git a/libs/partners/groq/langchain_groq/chat_models.py b/libs/partners/groq/langchain_groq/chat_models.py
index d98eb734610..95db3b86b55 100644
--- a/libs/partners/groq/langchain_groq/chat_models.py
+++ b/libs/partners/groq/langchain_groq/chat_models.py
@@ -108,7 +108,7 @@ class ChatGroq(BaseChatModel):
 
     Key init args — completion params:
         model:
-            Name of Groq model to use, e.g. `llama-3.1-8b-instant`.
+            Name of Groq model to use, e.g. `openai/gpt-oss-20b`.
         temperature:
             Sampling temperature. Ranges from `0.0` to `1.0`.
         max_tokens:
@@ -153,7 +153,7 @@ class ChatGroq(BaseChatModel):
         from langchain_groq import ChatGroq
 
         model = ChatGroq(
-            model="llama-3.1-8b-instant",
+            model="openai/gpt-oss-20b",
             temperature=0.0,
             max_retries=2,
             # other params...
@@ -175,7 +175,7 @@ class ChatGroq(BaseChatModel):
         response_metadata={'token_usage': {'completion_tokens': 38,
         'prompt_tokens': 28, 'total_tokens': 66, 'completion_time':
         0.057975474, 'prompt_time': 0.005366091, 'queue_time': None,
-        'total_time': 0.063341565}, 'model_name': 'llama-3.1-8b-instant',
+        'total_time': 0.063341565}, 'model_name': 'openai/gpt-oss-20b',
         'system_fingerprint': 'fp_c5f20b5bb1', 'finish_reason': 'stop',
         'logprobs': None}, id='run-ecc71d70-e10c-4b69-8b8c-b8027d95d4b8-0')
         ```
@@ -257,7 +257,7 @@ class ChatGroq(BaseChatModel):
         response_metadata={'token_usage': {'completion_tokens': 53,
         'prompt_tokens': 28, 'total_tokens': 81, 'completion_time':
         0.083623752, 'prompt_time': 0.007365126, 'queue_time': None,
-        'total_time': 0.090988878}, 'model_name': 'llama-3.1-8b-instant',
+        'total_time': 0.090988878}, 'model_name': 'openai/gpt-oss-20b',
         'system_fingerprint': 'fp_c5f20b5bb1', 'finish_reason': 'stop',
         'logprobs': None}, id='run-897f3391-1bea-42e2-82e0-686e2367bcf8-0')
         ```
@@ -342,7 +342,7 @@ class ChatGroq(BaseChatModel):
                 "queue_time": None,
                 "total_time": 0.11947467,
             },
-            "model_name": "llama-3.1-8b-instant",
+            "model_name": "openai/gpt-oss-20b",
             "system_fingerprint": "fp_c5f20b5bb1",
             "finish_reason": "stop",
             "logprobs": None,
diff --git a/libs/partners/groq/tests/integration_tests/test_chat_models.py b/libs/partners/groq/tests/integration_tests/test_chat_models.py
index e1cba270728..8efb3318b6c 100644
--- a/libs/partners/groq/tests/integration_tests/test_chat_models.py
+++ b/libs/partners/groq/tests/integration_tests/test_chat_models.py
@@ -379,7 +379,9 @@ def test_streaming_generation_info() -> None:
 
     callback = _FakeCallback()
     chat = ChatGroq(
-        model="llama-3.1-8b-instant",  # Use a model that properly streams content
+        # Non-reasoning model so the first tokens are plain content
+        model="qwen/qwen3.6-27b",
+        reasoning_effort="none",
         max_tokens=2,
         temperature=0,
         callbacks=[callback],
diff --git a/libs/partners/groq/tests/integration_tests/test_standard.py b/libs/partners/groq/tests/integration_tests/test_standard.py
index 2befd004b44..c9b75352b1f 100644
--- a/libs/partners/groq/tests/integration_tests/test_standard.py
+++ b/libs/partners/groq/tests/integration_tests/test_standard.py
@@ -21,7 +21,11 @@ class TestGroq(ChatModelIntegrationTests):
 
     @property
     def chat_model_params(self) -> dict:
-        return {"model": "llama-3.3-70b-versatile", "rate_limiter": rate_limiter}
+        return {
+            "model": "qwen/qwen3.6-27b",
+            "reasoning_effort": "none",
+            "rate_limiter": rate_limiter,
+        }
 
     @pytest.mark.xfail(
         reason="Groq models have inconsistent tool calling performance. See: "
diff --git a/libs/partners/groq/tests/unit_tests/__snapshots__/test_standard.ambr b/libs/partners/groq/tests/unit_tests/__snapshots__/test_standard.ambr
index 055fad288c1..ee309201725 100644
--- a/libs/partners/groq/tests/unit_tests/__snapshots__/test_standard.ambr
+++ b/libs/partners/groq/tests/unit_tests/__snapshots__/test_standard.ambr
@@ -16,7 +16,7 @@
       }),
       'max_retries': 2,
       'max_tokens': 100,
-      'model_name': 'llama-3.1-8b-instant',
+      'model_name': 'openai/gpt-oss-20b',
       'n': 1,
       'request_timeout': 60.0,
       'service_tier': 'on_demand',
diff --git a/libs/partners/groq/tests/unit_tests/test_chat_models.py b/libs/partners/groq/tests/unit_tests/test_chat_models.py
index e187f7e8975..de7d735c396 100644
--- a/libs/partners/groq/tests/unit_tests/test_chat_models.py
+++ b/libs/partners/groq/tests/unit_tests/test_chat_models.py
@@ -289,7 +289,7 @@ def test_with_structured_output_json_schema_strict_ignored_on_unsupported_model(
 
         foo: str
 
-    structured_model = ChatGroq(model="llama-3.1-8b-instant").with_structured_output(
+    structured_model = ChatGroq(model="qwen/qwen3.6-27b").with_structured_output(
         Response, method="json_schema", strict=True
     )
 
diff --git a/libs/partners/groq/tests/unit_tests/test_standard.py b/libs/partners/groq/tests/unit_tests/test_standard.py
index 5bcdfc869b8..0cd1033e650 100644
--- a/libs/partners/groq/tests/unit_tests/test_standard.py
+++ b/libs/partners/groq/tests/unit_tests/test_standard.py
@@ -17,4 +17,4 @@ class TestGroqStandard(ChatModelUnitTests):
 
     @property
     def chat_model_params(self) -> dict:
-        return {"model": "llama-3.1-8b-instant"}
+        return {"model": "openai/gpt-oss-20b"}