diff --git a/docs/_static/llama-stack-spec.html b/docs/_static/llama-stack-spec.html
index 4c5393947..41f240da1 100644
--- a/docs/_static/llama-stack-spec.html
+++ b/docs/_static/llama-stack-spec.html
@@ -10170,6 +10170,11 @@
                 ],
                 "title": "OptimizerType"
             },
+            "RuntimeConfig": {
+                "type": "object",
+                "title": "RuntimeConfig",
+                "description": "Provider-specific runtime configuration. Providers should document and parse their own expected fields. This model allows arbitrary extra fields for maximum flexibility."
+            },
             "TrainingConfig": {
                 "type": "object",
                 "properties": {
@@ -10274,6 +10279,9 @@
                                 }
                             ]
                         }
+                    },
+                    "runtime_config": {
+                        "$ref": "#/components/schemas/RuntimeConfig"
                     }
                 },
                 "additionalProperties": false,
@@ -11375,6 +11383,9 @@
                     },
                     "algorithm_config": {
                         "$ref": "#/components/schemas/AlgorithmConfig"
+                    },
+                    "runtime_config": {
+                        "$ref": "#/components/schemas/RuntimeConfig"
                     }
                 },
                 "additionalProperties": false,
diff --git a/docs/_static/llama-stack-spec.yaml b/docs/_static/llama-stack-spec.yaml
index a24f1a9db..5aebfd030 100644
--- a/docs/_static/llama-stack-spec.yaml
+++ b/docs/_static/llama-stack-spec.yaml
@@ -7000,6 +7000,13 @@ components:
         - adamw
         - sgd
       title: OptimizerType
+    RuntimeConfig:
+      type: object
+      title: RuntimeConfig
+      description: >-
+        Provider-specific runtime configuration. Providers should document and parse
+        their own expected fields. This model allows arbitrary extra fields for maximum
+        flexibility.
     TrainingConfig:
       type: object
       properties:
@@ -7060,6 +7067,8 @@ components:
               - type: string
               - type: array
               - type: object
+        runtime_config:
+          $ref: '#/components/schemas/RuntimeConfig'
       additionalProperties: false
       required:
         - job_uuid
@@ -7755,6 +7764,8 @@ components:
           type: string
         algorithm_config:
           $ref: '#/components/schemas/AlgorithmConfig'
+        runtime_config:
+          $ref: '#/components/schemas/RuntimeConfig'
       additionalProperties: false
       required:
         - job_uuid
diff --git a/llama_stack/apis/post_training/post_training.py b/llama_stack/apis/post_training/post_training.py
index e5f1bcb65..29a29dc28 100644
--- a/llama_stack/apis/post_training/post_training.py
+++ b/llama_stack/apis/post_training/post_training.py
@@ -169,6 +169,17 @@ class PostTrainingJobArtifactsResponse(BaseModel):
     # TODO(ashwin): metrics, evals
 
 
+@json_schema_type
+class RuntimeConfig(BaseModel):
+    """
+    Provider-specific runtime configuration. Providers should document and parse their own expected fields.
+    This model allows arbitrary extra fields for maximum flexibility.
+    """
+
+    class Config:
+        extra = "allow"
+
+
 class PostTraining(Protocol):
     @webmethod(route="/post-training/supervised-fine-tune", method="POST")
     async def supervised_fine_tune(
@@ -183,6 +194,7 @@ class PostTraining(Protocol):
         ),
         checkpoint_dir: Optional[str] = None,
         algorithm_config: Optional[AlgorithmConfig] = None,
+        runtime_config: Optional[RuntimeConfig] = None,
     ) -> PostTrainingJob: ...
 
     @webmethod(route="/post-training/preference-optimize", method="POST")
@@ -194,6 +206,7 @@ class PostTraining(Protocol):
         training_config: TrainingConfig,
         hyperparam_search_config: Dict[str, Any],
         logger_config: Dict[str, Any],
+        runtime_config: Optional[RuntimeConfig] = None,
     ) -> PostTrainingJob: ...
 
     @webmethod(route="/post-training/jobs", method="GET")
diff --git a/llama_stack/providers/inline/post_training/torchtune/post_training.py b/llama_stack/providers/inline/post_training/torchtune/post_training.py
index cc1a6a5fe..7a17b9c4c 100644
--- a/llama_stack/providers/inline/post_training/torchtune/post_training.py
+++ b/llama_stack/providers/inline/post_training/torchtune/post_training.py
@@ -18,6 +18,7 @@ from llama_stack.apis.post_training import (
     PostTrainingJob,
     PostTrainingJobArtifactsResponse,
     PostTrainingJobStatusResponse,
+    RuntimeConfig,
     TrainingConfig,
 )
 from llama_stack.providers.inline.post_training.torchtune.config import (
@@ -80,6 +81,7 @@ class TorchtunePostTrainingImpl:
         model: str,
         checkpoint_dir: Optional[str],
         algorithm_config: Optional[AlgorithmConfig],
+        runtime_config: Optional[RuntimeConfig] = None,
     ) -> PostTrainingJob:
         if isinstance(algorithm_config, LoraFinetuningConfig):