diff --git a/llama_stack/apis/inference/inference.py b/llama_stack/apis/inference/inference.py
index d93bb6c45..bac79aa30 100644
--- a/llama_stack/apis/inference/inference.py
+++ b/llama_stack/apis/inference/inference.py
@@ -1052,6 +1052,7 @@ class InferenceProvider(Protocol):
         prompt_logprobs: int | None = None,
         # for fill-in-the-middle type completion
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         """Create completion.
 
@@ -1075,6 +1076,7 @@ class InferenceProvider(Protocol):
         :param top_p: (Optional) The top p to use.
         :param user: (Optional) The user to use.
         :param suffix: (Optional) The suffix that should be appended to the completion.
+        :param kwargs: (Optional) Additional provider-specific parameters to pass through as extra_body.
         :returns: An OpenAICompletion.
         """
         ...
diff --git a/llama_stack/core/routers/inference.py b/llama_stack/core/routers/inference.py
index 98cacbb49..2afb67d90 100644
--- a/llama_stack/core/routers/inference.py
+++ b/llama_stack/core/routers/inference.py
@@ -201,6 +201,7 @@ class InferenceRouter(Inference):
         guided_choice: list[str] | None = None,
         prompt_logprobs: int | None = None,
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         logger.debug(
             f"InferenceRouter.openai_completion: {model=}, {stream=}, {prompt=}",
@@ -227,6 +228,7 @@ class InferenceRouter(Inference):
             guided_choice=guided_choice,
             prompt_logprobs=prompt_logprobs,
             suffix=suffix,
+            **kwargs,
         )
         provider = await self.routing_table.get_provider_impl(model_obj.identifier)
         if stream:
diff --git a/llama_stack/providers/inline/inference/sentence_transformers/sentence_transformers.py b/llama_stack/providers/inline/inference/sentence_transformers/sentence_transformers.py
index 7aa880de3..c5450448e 100644
--- a/llama_stack/providers/inline/inference/sentence_transformers/sentence_transformers.py
+++ b/llama_stack/providers/inline/inference/sentence_transformers/sentence_transformers.py
@@ -96,6 +96,7 @@ class SentenceTransformersInferenceImpl(
         prompt_logprobs: int | None = None,
         # for fill-in-the-middle type completion
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         raise NotImplementedError("OpenAI completion not supported by sentence transformers provider")
 
diff --git a/llama_stack/providers/remote/inference/bedrock/bedrock.py b/llama_stack/providers/remote/inference/bedrock/bedrock.py
index ee354aaf3..ccd18a3e8 100644
--- a/llama_stack/providers/remote/inference/bedrock/bedrock.py
+++ b/llama_stack/providers/remote/inference/bedrock/bedrock.py
@@ -158,6 +158,7 @@ class BedrockInferenceAdapter(
         prompt_logprobs: int | None = None,
         # for fill-in-the-middle type completion
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         raise NotImplementedError("OpenAI completion not supported by the Bedrock provider")
 
diff --git a/llama_stack/providers/remote/inference/databricks/databricks.py b/llama_stack/providers/remote/inference/databricks/databricks.py
index 200b36171..c6838271f 100644
--- a/llama_stack/providers/remote/inference/databricks/databricks.py
+++ b/llama_stack/providers/remote/inference/databricks/databricks.py
@@ -63,5 +63,6 @@ class DatabricksInferenceAdapter(OpenAIMixin):
         guided_choice: list[str] | None = None,
         prompt_logprobs: int | None = None,
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         raise NotImplementedError()
diff --git a/llama_stack/providers/remote/inference/llama_openai_compat/llama.py b/llama_stack/providers/remote/inference/llama_openai_compat/llama.py
index 165992c16..37010114b 100644
--- a/llama_stack/providers/remote/inference/llama_openai_compat/llama.py
+++ b/llama_stack/providers/remote/inference/llama_openai_compat/llama.py
@@ -54,6 +54,7 @@ class LlamaCompatInferenceAdapter(OpenAIMixin):
         guided_choice: list[str] | None = None,
         prompt_logprobs: int | None = None,
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         raise NotImplementedError()
 
diff --git a/llama_stack/providers/remote/inference/passthrough/passthrough.py b/llama_stack/providers/remote/inference/passthrough/passthrough.py
index 8d36a4980..372d2d663 100644
--- a/llama_stack/providers/remote/inference/passthrough/passthrough.py
+++ b/llama_stack/providers/remote/inference/passthrough/passthrough.py
@@ -100,6 +100,7 @@ class PassthroughInferenceAdapter(Inference):
         guided_choice: list[str] | None = None,
         prompt_logprobs: int | None = None,
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         client = self._get_client()
         model_obj = await self.model_store.get_model(model)
@@ -124,6 +125,7 @@ class PassthroughInferenceAdapter(Inference):
             user=user,
             guided_choice=guided_choice,
             prompt_logprobs=prompt_logprobs,
+            **kwargs,
         )
 
         return await client.inference.openai_completion(**params)
diff --git a/llama_stack/providers/utils/inference/litellm_openai_mixin.py b/llama_stack/providers/utils/inference/litellm_openai_mixin.py
index 68373ada9..22bfd36c4 100644
--- a/llama_stack/providers/utils/inference/litellm_openai_mixin.py
+++ b/llama_stack/providers/utils/inference/litellm_openai_mixin.py
@@ -247,6 +247,7 @@ class LiteLLMOpenAIMixin(
         guided_choice: list[str] | None = None,
         prompt_logprobs: int | None = None,
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         model_obj = await self.model_store.get_model(model)
         params = await prepare_openai_completion_params(
@@ -271,6 +272,7 @@ class LiteLLMOpenAIMixin(
             prompt_logprobs=prompt_logprobs,
             api_key=self.get_api_key(),
             api_base=self.api_base,
+            **kwargs,
         )
         return await litellm.atext_completion(**params)
 
diff --git a/llama_stack/providers/utils/inference/openai_mixin.py b/llama_stack/providers/utils/inference/openai_mixin.py
index eac611c88..7c08e668d 100644
--- a/llama_stack/providers/utils/inference/openai_mixin.py
+++ b/llama_stack/providers/utils/inference/openai_mixin.py
@@ -247,6 +247,7 @@ class OpenAIMixin(NeedsRequestProviderData, ABC, BaseModel):
         guided_choice: list[str] | None = None,
         prompt_logprobs: int | None = None,
         suffix: str | None = None,
+        **kwargs: Any,
     ) -> OpenAICompletion:
         """
         Direct OpenAI completion API call.
@@ -261,6 +262,9 @@ class OpenAIMixin(NeedsRequestProviderData, ABC, BaseModel):
         if guided_choice:
             extra_body["guided_choice"] = guided_choice
 
+        # Merge any additional kwargs into extra_body
+        extra_body.update(kwargs)
+
         # TODO: fix openai_completion to return type compatible with OpenAI's API response
         resp = await self.client.completions.create(
             **await prepare_openai_completion_params(