diff --git a/specification/cognitiveservices/ContentSafety/models.tsp b/specification/cognitiveservices/ContentSafety/models.tsp
index 6459f69d9e01..b77017314c13 100644
--- a/specification/cognitiveservices/ContentSafety/models.tsp
+++ b/specification/cognitiveservices/ContentSafety/models.tsp
@@ -40,6 +40,14 @@ enum AnalyzeImageOutputType {
   FourSeverityLevels,
 }
 
+@added(ContentSafety.Versions.v2024_01_30_Preview)
+enum ModelStatus {
+  created,
+  training,
+  ready,
+  failed,
+}
+
 @doc("The text analysis request.")
 model AnalyzeTextOptions {
   @doc("The text needs to be analyzed. We support a maximum of 10k Unicode characters (Unicode code points) in the text of one request.")
@@ -61,6 +69,20 @@ model AnalyzeTextOptions {
   @added(ContentSafety.Versions.v2023_10_30_Preview)
   @doc("The incidents to detect.")
   incidents?: IncidentOptions;
+
+  @added(ContentSafety.Versions.v2024_01_30_Preview)
+  @doc("The customized categories will be analyzed. If they are not assigned, the analysis results for all available customized categories will be returned.")
+  customizedCategories?: CustomizedCategory[];
+}
+
+@added(ContentSafety.Versions.v2024_01_30_Preview)
+@doc("Customized category for inference.")
+model CustomizedCategory {
+  @doc("Category name")
+  categoryName: string;
+
+  @doc("Model ID for the category. If not provided, the latest available model will be used.")
+  modelId: string;
 }
 
 @added(ContentSafety.Versions.v2023_10_30_Preview)
@@ -88,6 +110,28 @@ model AnalyzeTextResult {
   @added(ContentSafety.Versions.v2024_01_30_Preview)
   @doc("Chunks in the original text detected as harmful content. Analysis result and scores are caused by these.")
   citation?: string[];
+
+  @added(ContentSafety.Versions.v2024_01_30_Preview)
+  @doc("Analysis result for customized categories.")
+  customizedCategoriesAnalysis: TextCustomizedCategoryAnalysis[];
+}
+
+@added(ContentSafety.Versions.v2024_01_30_Preview)
+@doc("Text customized category analysis result.")
+model TextCustomizedCategoryAnalysis {
+  @doc("Customized category name")
+  categoryName: string;
+
+  @doc("customized category analysis")
+  customizedCategoriesAnalysis: TextCustomizedCategoryClassResult[];
+}
+
+@added(ContentSafety.Versions.v2024_01_30_Preview)
+@doc("customized category analysis result")
+model TextCustomizedCategoryClassResult {
+  id: int32;
+  @renamedFrom(Versions.v2024_01_30_Preview, "name")
+  className: string;
 }
 
 @doc("The result of blocklist match.")
@@ -456,9 +500,11 @@ model PreDefinedConcept {
 
 @added(Versions.v2023_10_30_Preview)
 @doc("Label definition.")
-model SubCategory {
+@renamedFrom(Versions.v2024_01_30_Preview, "SubCategory")
+model Class {
   id: int32;
-  name: string;
+  @renamedFrom(Versions.v2024_01_30_Preview, "name")
+  className: string;
   statements: string[];
 }
 
@@ -473,12 +519,39 @@ model TextCustomizedCategory {
   @maxLength(64)
   categoryName: string;
 
+  @doc("A predefined concept with its definition can be used directly in the subcategories.")
+  @added(Versions.v2023_10_30_Preview)
+  @removed(Versions.v2024_01_30_Preview)
   preDefinedConcepts?: PreDefinedConcept[];
-  subCategories: SubCategory[];
+
+  @doc("Subcategories are detailed classes of the category. It is required there is a class 'safe' with id=0.")
+  @renamedFrom(Versions.v2024_01_30_Preview, "subCategories")
+  classes: Class[];
+
+  @added(Versions.v2023_10_30_Preview)
+  @removed(Versions.v2024_01_30_Preview)
   emphases?: string[];
+
+  @doc("Blob that stores the examples.")
   exampleBlobUrl?: url;
 }
 
+@added(ContentSafety.Versions.v2024_01_30_Preview)
+@doc("The response for async training triggering.")
+model SubmitModelTrainingResponse {
+  ...AcceptedResponse;
+  
+  @header("operation-location")
+  @doc("The location of the status API for monitoring the triggered model.")
+  modelUrl: string;
+}
+
+@added(ContentSafety.Versions.v2024_01_30_Preview)
+model AsyncJobWarning {
+  code: string;
+  messgae: string;
+}
+
 #suppress "@azure-tools/typespec-azure-core/documentation-required" "MUST fix in next update"
 @added(ContentSafety.Versions.v2023_10_30_Preview)
 @doc("ImageWithText analyze category.")
@@ -489,6 +562,19 @@ enum ImageWithTextCategory {
   Violence,
 }
 
+@added(ContentSafety.Versions.v2024_01_30_Preview)
+@parentResource(TextCustomizedCategory)
+@resource("models")
+model TextTrainedModel {
+  @key
+  modelId: string;
+  status: ModelStatus;
+  createdTime: utcDateTime;
+  lastUpdateTime: utcDateTime;
+  warnings?: AsyncJobWarning[];
+  errors?: string[];
+}
+
 @added(ContentSafety.Versions.v2023_10_30_Preview)
 @doc("The analysis request of the image with text.")
 model AnalyzeImageWithTextOptions {
diff --git a/specification/cognitiveservices/ContentSafety/routes.tsp b/specification/cognitiveservices/ContentSafety/routes.tsp
index 6e0b436297b0..16b36381a21a 100644
--- a/specification/cognitiveservices/ContentSafety/routes.tsp
+++ b/specification/cognitiveservices/ContentSafety/routes.tsp
@@ -290,6 +290,37 @@ interface TextCategoryCustomization {
     TextCustomizedCategory,
     ListQueryParametersTrait<StandardListQueryParameters>
   >;
+
+  @action("trainModel")
+  @added(Versions.v2024_01_30_Preview)
+  trainModel is CategoryOps.ResourceAction<
+    TextCustomizedCategory,
+    {},
+    SubmitModelTrainingResponse
+  >;
+} 
+
+interface TextCustomizedMdoelOps
+  extends Azure.Core.ResourceOperations<NoRepeatableRequests &
+      NoConditionalRequests &
+      NoClientRequestId> {}
+
+@added(Versions.v2024_01_30_Preview)
+interface TextCustomizedModelOperations {
+  @summary("List all existing models")
+  @doc("List existing models.")
+  listTextCustomizedModels is TextCustomizedMdoelOps.ResourceList<
+    TextTrainedModel,
+    ListQueryParametersTrait<StandardListQueryParameters>
+  >;
+
+  @doc("Get a model that is not deleted.")
+  getTextCustomizedModels is TextCustomizedMdoelOps.ResourceRead<TextTrainedModel>;
+
+  @doc("If the model is training, the training process will be cancelled and the model will also be deleted.")
+  deleteCustomizedModel is TextCustomizedMdoelOps.ResourceDelete<
+    TextTrainedModel
+  >;
 }
 
 @added(Versions.v2023_10_30_Preview)
diff --git a/specification/cognitiveservices/data-plane/ContentSafety/preview/2023-10-30-preview/contentsafety.json b/specification/cognitiveservices/data-plane/ContentSafety/preview/2023-10-30-preview/contentsafety.json
index f4f32e3af776..9d0aad9dfe01 100644
--- a/specification/cognitiveservices/data-plane/ContentSafety/preview/2023-10-30-preview/contentsafety.json
+++ b/specification/cognitiveservices/data-plane/ContentSafety/preview/2023-10-30-preview/contentsafety.json
@@ -2931,6 +2931,7 @@
         },
         "preDefinedConcepts": {
           "type": "array",
+          "description": "A predefined concept with its definition can be used directly in the subcategories.",
           "items": {
             "$ref": "#/definitions/PreDefinedConcept"
           },
@@ -2938,6 +2939,7 @@
         },
         "subCategories": {
           "type": "array",
+          "description": "Subcategories are detailed classes of the category. It is required there is a class 'safe' with id=0.",
           "items": {
             "$ref": "#/definitions/SubCategory"
           }
@@ -2950,7 +2952,8 @@
         },
         "exampleBlobUrl": {
           "type": "string",
-          "format": "uri"
+          "format": "uri",
+          "description": "Blob that stores the examples."
         }
       },
       "required": [
diff --git a/specification/cognitiveservices/data-plane/ContentSafety/preview/2024-01-30-preview/contentsafety.json b/specification/cognitiveservices/data-plane/ContentSafety/preview/2024-01-30-preview/contentsafety.json
index 208f36065325..f1efad653ecf 100644
--- a/specification/cognitiveservices/data-plane/ContentSafety/preview/2024-01-30-preview/contentsafety.json
+++ b/specification/cognitiveservices/data-plane/ContentSafety/preview/2024-01-30-preview/contentsafety.json
@@ -1055,6 +1055,189 @@
         }
       }
     },
+    "/text/categories/{categoryName}:trainModel": {
+      "post": {
+        "operationId": "TextCategoryCustomization_TrainModel",
+        "description": "Resource action operation template.",
+        "parameters": [
+          {
+            "$ref": "#/parameters/Azure.Core.Foundations.ApiVersionParameter"
+          },
+          {
+            "name": "categoryName",
+            "in": "path",
+            "description": "Text customizedCategories name.",
+            "required": true,
+            "type": "string",
+            "maxLength": 64,
+            "pattern": "^Customized_[0-9A-Za-z._~-]+$"
+          }
+        ],
+        "responses": {
+          "202": {
+            "description": "The request has been accepted for processing, but processing has not yet completed.",
+            "headers": {
+              "operation-location": {
+                "type": "string",
+                "description": "The location of the status API for monitoring the triggered model."
+              }
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/Azure.Core.Foundations.ErrorResponse"
+            },
+            "headers": {
+              "x-ms-error-code": {
+                "type": "string",
+                "description": "String error code indicating what went wrong."
+              }
+            }
+          }
+        }
+      }
+    },
+    "/text/categories/{categoryName}/models": {
+      "get": {
+        "operationId": "TextCustomizedModelOperations_ListTextCustomizedModels",
+        "summary": "List all existing models",
+        "description": "List existing models.",
+        "parameters": [
+          {
+            "$ref": "#/parameters/Azure.Core.Foundations.ApiVersionParameter"
+          },
+          {
+            "name": "categoryName",
+            "in": "path",
+            "description": "Text customizedCategories name.",
+            "required": true,
+            "type": "string",
+            "maxLength": 64,
+            "pattern": "^Customized_[0-9A-Za-z._~-]+$"
+          },
+          {
+            "$ref": "#/parameters/Azure.Core.TopQueryParameter"
+          },
+          {
+            "$ref": "#/parameters/Azure.Core.SkipQueryParameter"
+          },
+          {
+            "$ref": "#/parameters/Azure.Core.MaxPageSizeQueryParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The request has succeeded.",
+            "schema": {
+              "$ref": "#/definitions/PagedTextTrainedModel"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/Azure.Core.Foundations.ErrorResponse"
+            },
+            "headers": {
+              "x-ms-error-code": {
+                "type": "string",
+                "description": "String error code indicating what went wrong."
+              }
+            }
+          }
+        },
+        "x-ms-pageable": {
+          "nextLinkName": "nextLink"
+        }
+      }
+    },
+    "/text/categories/{categoryName}/models/{modelId}": {
+      "get": {
+        "operationId": "TextCustomizedModelOperations_GetTextCustomizedModels",
+        "description": "Get a model that is not deleted.",
+        "parameters": [
+          {
+            "$ref": "#/parameters/Azure.Core.Foundations.ApiVersionParameter"
+          },
+          {
+            "name": "categoryName",
+            "in": "path",
+            "description": "Text customizedCategories name.",
+            "required": true,
+            "type": "string",
+            "maxLength": 64,
+            "pattern": "^Customized_[0-9A-Za-z._~-]+$"
+          },
+          {
+            "name": "modelId",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The request has succeeded.",
+            "schema": {
+              "$ref": "#/definitions/TextTrainedModel"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/Azure.Core.Foundations.ErrorResponse"
+            },
+            "headers": {
+              "x-ms-error-code": {
+                "type": "string",
+                "description": "String error code indicating what went wrong."
+              }
+            }
+          }
+        }
+      },
+      "delete": {
+        "operationId": "TextCustomizedModelOperations_DeleteCustomizedModel",
+        "description": "If the model is training, the training process will be cancelled and the model will also be deleted.",
+        "parameters": [
+          {
+            "$ref": "#/parameters/Azure.Core.Foundations.ApiVersionParameter"
+          },
+          {
+            "name": "categoryName",
+            "in": "path",
+            "description": "Text customizedCategories name.",
+            "required": true,
+            "type": "string",
+            "maxLength": 64,
+            "pattern": "^Customized_[0-9A-Za-z._~-]+$"
+          },
+          {
+            "name": "modelId",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "responses": {
+          "204": {
+            "description": "There is no content to send for this request, but the headers may be useful. "
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/Azure.Core.Foundations.ErrorResponse"
+            },
+            "headers": {
+              "x-ms-error-code": {
+                "type": "string",
+                "description": "String error code indicating what went wrong."
+              }
+            }
+          }
+        }
+      }
+    },
     "/text/incidents": {
       "get": {
         "operationId": "TextIncidents_ListIncidents",
@@ -1920,6 +2103,14 @@
         "incidents": {
           "$ref": "#/definitions/IncidentOptions",
           "description": "The incidents to detect."
+        },
+        "customizedCategories": {
+          "type": "array",
+          "description": "The customized categories will be analyzed. If they are not assigned, the analysis results for all available customized categories will be returned.",
+          "items": {
+            "$ref": "#/definitions/CustomizedCategory"
+          },
+          "x-ms-identifiers": []
         }
       },
       "required": [
@@ -2011,10 +2202,19 @@
           "items": {
             "type": "string"
           }
+        },
+        "customizedCategoriesAnalysis": {
+          "type": "array",
+          "description": "Analysis result for customized categories.",
+          "items": {
+            "$ref": "#/definitions/TextCustomizedCategoryAnalysis"
+          },
+          "x-ms-identifiers": []
         }
       },
       "required": [
-        "categoriesAnalysis"
+        "categoriesAnalysis",
+        "customizedCategoriesAnalysis"
       ]
     },
     "AnnotateTextOptions": {
@@ -2059,6 +2259,21 @@
         "name"
       ]
     },
+    "AsyncJobWarning": {
+      "type": "object",
+      "properties": {
+        "code": {
+          "type": "string"
+        },
+        "messgae": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "code",
+        "messgae"
+      ]
+    },
     "Azure.Core.Foundations.Error": {
       "type": "object",
       "description": "The error object.",
@@ -2120,6 +2335,48 @@
         }
       }
     },
+    "Class": {
+      "type": "object",
+      "description": "Label definition.",
+      "properties": {
+        "id": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "className": {
+          "type": "string"
+        },
+        "statements": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      },
+      "required": [
+        "id",
+        "className",
+        "statements"
+      ]
+    },
+    "CustomizedCategory": {
+      "type": "object",
+      "description": "Customized category for inference.",
+      "properties": {
+        "categoryName": {
+          "type": "string",
+          "description": "Category name"
+        },
+        "modelId": {
+          "type": "string",
+          "description": "Model ID for the category. If not provided, the latest available model will be used."
+        }
+      },
+      "required": [
+        "categoryName",
+        "modelId"
+      ]
+    },
     "DetectUngroundednessOptions": {
       "type": "object",
       "description": "The request of ungroundedness detection.",
@@ -2476,6 +2733,19 @@
         "incidentSampleId"
       ]
     },
+    "ModelStatus": {
+      "type": "string",
+      "enum": [
+        "created",
+        "training",
+        "ready",
+        "failed"
+      ],
+      "x-ms-enum": {
+        "name": "ModelStatus",
+        "modelAsString": true
+      }
+    },
     "PagedImageIncident": {
       "type": "object",
       "description": "Paged collection of ImageIncident items",
@@ -2630,20 +2900,26 @@
         "value"
       ]
     },
-    "PreDefinedConcept": {
+    "PagedTextTrainedModel": {
       "type": "object",
-      "description": "Pre-defined concept.",
+      "description": "Paged collection of TextTrainedModel items",
       "properties": {
-        "concept": {
-          "type": "string"
+        "value": {
+          "type": "array",
+          "description": "The TextTrainedModel items on this page",
+          "items": {
+            "$ref": "#/definitions/TextTrainedModel"
+          },
+          "x-ms-identifiers": []
         },
-        "description": {
-          "type": "string"
+        "nextLink": {
+          "type": "string",
+          "format": "uri",
+          "description": "The link to the next page of items"
         }
       },
       "required": [
-        "concept",
-        "description"
+        "value"
       ]
     },
     "ProtectedMaterialAnalysisResult": {
@@ -2707,30 +2983,6 @@
         "incidentSampleIds"
       ]
     },
-    "SubCategory": {
-      "type": "object",
-      "description": "Label definition.",
-      "properties": {
-        "id": {
-          "type": "integer",
-          "format": "int32"
-        },
-        "name": {
-          "type": "string"
-        },
-        "statements": {
-          "type": "array",
-          "items": {
-            "type": "string"
-          }
-        }
-      },
-      "required": [
-        "id",
-        "name",
-        "statements"
-      ]
-    },
     "Task": {
       "type": "string",
       "description": "Task type.",
@@ -2886,33 +3138,60 @@
             "create"
           ]
         },
-        "preDefinedConcepts": {
-          "type": "array",
-          "items": {
-            "$ref": "#/definitions/PreDefinedConcept"
-          },
-          "x-ms-identifiers": []
-        },
-        "subCategories": {
+        "classes": {
           "type": "array",
+          "description": "Subcategories are detailed classes of the category. It is required there is a class 'safe' with id=0.",
           "items": {
-            "$ref": "#/definitions/SubCategory"
+            "$ref": "#/definitions/Class"
           }
         },
-        "emphases": {
+        "exampleBlobUrl": {
+          "type": "string",
+          "format": "uri",
+          "description": "Blob that stores the examples."
+        }
+      },
+      "required": [
+        "categoryName",
+        "classes"
+      ]
+    },
+    "TextCustomizedCategoryAnalysis": {
+      "type": "object",
+      "description": "Text customized category analysis result.",
+      "properties": {
+        "categoryName": {
+          "type": "string",
+          "description": "Customized category name"
+        },
+        "customizedCategoriesAnalysis": {
           "type": "array",
+          "description": "customized category analysis",
           "items": {
-            "type": "string"
+            "$ref": "#/definitions/TextCustomizedCategoryClassResult"
           }
-        },
-        "exampleBlobUrl": {
-          "type": "string",
-          "format": "uri"
         }
       },
       "required": [
         "categoryName",
-        "subCategories"
+        "customizedCategoriesAnalysis"
+      ]
+    },
+    "TextCustomizedCategoryClassResult": {
+      "type": "object",
+      "description": "customized category analysis result",
+      "properties": {
+        "id": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "className": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "id",
+        "className"
       ]
     },
     "TextIncident": {
@@ -2998,6 +3277,44 @@
         "incidentSampleId"
       ]
     },
+    "TextTrainedModel": {
+      "type": "object",
+      "properties": {
+        "modelId": {
+          "type": "string"
+        },
+        "status": {
+          "$ref": "#/definitions/ModelStatus"
+        },
+        "createdTime": {
+          "type": "string",
+          "format": "date-time"
+        },
+        "lastUpdateTime": {
+          "type": "string",
+          "format": "date-time"
+        },
+        "warnings": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/AsyncJobWarning"
+          },
+          "x-ms-identifiers": []
+        },
+        "errors": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      },
+      "required": [
+        "modelId",
+        "status",
+        "createdTime",
+        "lastUpdateTime"
+      ]
+    },
     "UngroundedDetails": {
       "type": "object",
       "description": "The detailed information about a text identified as ungrounded.",