diff --git a/guardrails-api-client/guardrails_api_client/models/rail_spec.py b/guardrails-api-client/guardrails_api_client/models/rail_spec.py
index 7903190..423217f 100644
--- a/guardrails-api-client/guardrails_api_client/models/rail_spec.py
+++ b/guardrails-api-client/guardrails_api_client/models/rail_spec.py
@@ -19,24 +19,22 @@ class RailSpec:
 
     Attributes:
         output_schema (Schema):
-        prompt (str):
         version (RailSpecVersion):  Default: RailSpecVersion.VALUE_0.
         input_schema (Union[Unset, Schema]):
         instructions (Union[Unset, str]):
+        prompt (Union[Unset, str]):
     """
 
     output_schema: "Schema"
-    prompt: str
     version: RailSpecVersion = RailSpecVersion.VALUE_0
     input_schema: Union[Unset, "Schema"] = UNSET
     instructions: Union[Unset, str] = UNSET
+    prompt: Union[Unset, str] = UNSET
     additional_properties: Dict[str, Any] = _attrs_field(init=False, factory=dict)
 
     def to_dict(self) -> Dict[str, Any]:
         output_schema = self.output_schema.to_dict()
 
-        prompt = self.prompt
-
         version = self.version.value
 
         input_schema: Union[Unset, Dict[str, Any]] = UNSET
@@ -45,12 +43,13 @@ def to_dict(self) -> Dict[str, Any]:
 
         instructions = self.instructions
 
+        prompt = self.prompt
+
         field_dict: Dict[str, Any] = {}
         field_dict.update(self.additional_properties)
         field_dict.update(
             {
                 "outputSchema": output_schema,
-                "prompt": prompt,
                 "version": version,
             }
         )
@@ -58,6 +57,8 @@ def to_dict(self) -> Dict[str, Any]:
             field_dict["inputSchema"] = input_schema
         if instructions is not UNSET:
             field_dict["instructions"] = instructions
+        if prompt is not UNSET:
+            field_dict["prompt"] = prompt
 
         return field_dict
 
@@ -68,8 +69,6 @@ def from_dict(cls: Type[T], src_dict: Dict[str, Any]) -> T:
         d = src_dict.copy()
         output_schema = Schema.from_dict(d.pop("outputSchema"))
 
-        prompt = d.pop("prompt")
-
         version = RailSpecVersion(d.pop("version"))
 
         _input_schema = d.pop("inputSchema", UNSET)
@@ -81,12 +80,14 @@ def from_dict(cls: Type[T], src_dict: Dict[str, Any]) -> T:
 
         instructions = d.pop("instructions", UNSET)
 
+        prompt = d.pop("prompt", UNSET)
+
         rail_spec = cls(
             output_schema=output_schema,
-            prompt=prompt,
             version=version,
             input_schema=input_schema,
             instructions=instructions,
+            prompt=prompt,
         )
 
         rail_spec.additional_properties = d
diff --git a/open-api-spec.yml b/open-api-spec.yml
index db07370..aa3b899 100644
--- a/open-api-spec.yml
+++ b/open-api-spec.yml
@@ -599,7 +599,6 @@ components:
             - "0.1"
       required:
         - outputSchema
-        - prompt
         - version
     Schema:
       type: object
diff --git a/service-specs/guardrails-service-spec.yml b/service-specs/guardrails-service-spec.yml
index 73ef2fb..132077b 100644
--- a/service-specs/guardrails-service-spec.yml
+++ b/service-specs/guardrails-service-spec.yml
@@ -301,7 +301,6 @@ components:
             - "0.1"
       required:
         - outputSchema
-        - prompt
         - version
     Schema:
       type: object