diff --git a/docs/my-website/docs/reasoning_content.md b/docs/my-website/docs/reasoning_content.md
index f9cab01639d..5ddb5aefd47 100644
--- a/docs/my-website/docs/reasoning_content.md
+++ b/docs/my-website/docs/reasoning_content.md
@@ -20,6 +20,7 @@ Supported Providers:
 - Vertex AI (`vertex_ai/`)
 - Perplexity (`perplexity/`)
 - Mistral AI (Magistral models) (`mistral/`)
+- Groq (`groq/`)
 
 LiteLLM will standardize the `reasoning_content` in the response and `thinking_blocks` in the assistant message.
 
diff --git a/litellm/llms/groq/chat/transformation.py b/litellm/llms/groq/chat/transformation.py
index 86fa323f9e3..165301efb5c 100644
--- a/litellm/llms/groq/chat/transformation.py
+++ b/litellm/llms/groq/chat/transformation.py
@@ -6,6 +6,8 @@ from typing import Any, Coroutine, List, Literal, Optional, Tuple, Union, cast,
 import httpx
 from pydantic import BaseModel
 
+import litellm
+from litellm._logging import verbose_logger
 from litellm.litellm_core_utils.litellm_logging import Logging as LiteLLMLoggingObj
 from litellm.secret_managers.main import get_secret_str
 from litellm.types.llms.openai import (
@@ -55,6 +57,10 @@ class GroqChatConfig(OpenAILikeChatConfig):
             if key != "self" and value is not None:
                 setattr(self.__class__, key, value)
 
+    @property
+    def custom_llm_provider(self) -> Optional[str]:
+        return "groq"
+
     @classmethod
     def get_config(cls):
         return super().get_config()
@@ -65,6 +71,15 @@ class GroqChatConfig(OpenAILikeChatConfig):
             base_params.remove("max_retries")
         except ValueError:
             pass
+
+        try:
+            if litellm.supports_reasoning(
+                model=model, custom_llm_provider=self.custom_llm_provider
+            ):
+                base_params.append("reasoning_effort")
+        except Exception as e:
+            verbose_logger.debug(f"Error checking if model supports reasoning: {e}")
+
         return base_params
 
     @overload
diff --git a/litellm/main.py b/litellm/main.py
index 9c2aa678369..d0377490942 100644
--- a/litellm/main.py
+++ b/litellm/main.py
@@ -356,7 +356,7 @@ async def acompletion(
     logprobs: Optional[bool] = None,
     top_logprobs: Optional[int] = None,
     deployment_id=None,
-    reasoning_effort: Optional[Literal["minimal", "low", "medium", "high"]] = None,
+    reasoning_effort: Optional[Literal["none", "minimal", "low", "medium", "high", "default"]] = None,
     safety_identifier: Optional[str] = None,
     # set api_base, api_version, api_key
     base_url: Optional[str] = None,
@@ -897,7 +897,7 @@ def completion(  # type: ignore # noqa: PLR0915
     logit_bias: Optional[dict] = None,
     user: Optional[str] = None,
     # openai v1.0+ new params
-    reasoning_effort: Optional[Literal["minimal", "low", "medium", "high"]] = None,
+    reasoning_effort: Optional[Literal["none", "minimal", "low", "medium", "high", "default"]] = None,
     response_format: Optional[Union[dict, Type[BaseModel]]] = None,
     seed: Optional[int] = None,
     tools: Optional[List] = None,
diff --git a/tests/llm_translation/test_groq.py b/tests/llm_translation/test_groq.py
index dd1ae0aed6d..9a9dae9ee89 100644
--- a/tests/llm_translation/test_groq.py
+++ b/tests/llm_translation/test_groq.py
@@ -1,6 +1,16 @@
-from base_llm_unit_tests import BaseLLMChatTest
+import os
+import sys
 
 
+import pytest
+
+# sys.path.insert(
+#     0, os.path.abspath("../..")
+# )  # Adds the parent directory to the system path
+
+from base_llm_unit_tests import BaseLLMChatTest
+from litellm.llms.groq.chat.transformation import GroqChatConfig
+
 class TestGroq(BaseLLMChatTest):
     def get_base_completion_call_args(self) -> dict:
         return {
@@ -10,3 +20,9 @@ class TestGroq(BaseLLMChatTest):
     def test_tool_call_no_arguments(self, tool_call_no_arguments):
         """Test that tool calls with no arguments is translated correctly. Relevant issue: https://github.com/BerriAI/litellm/issues/6833"""
         pass
+
+    @pytest.mark.parametrize("model", ["groq/qwen/qwen3-32b", "groq/openai/gpt-oss-20b", "groq/openai/gpt-oss-120b"])
+    def test_reasoning_effort_in_supported_params(self, model):
+        """Test that reasoning_effort is in the list of supported parameters for Groq"""
+        supported_params = GroqChatConfig().get_supported_openai_params(model=model)
+        assert "reasoning_effort" in supported_params