diff --git a/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/preview/2015-11-01-preview/OperationalInsights.json b/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/preview/2015-11-01-preview/OperationalInsights.json
index 6f189cd3152e..9d47ed4d361a 100644
--- a/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/preview/2015-11-01-preview/OperationalInsights.json
+++ b/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/preview/2015-11-01-preview/OperationalInsights.json
@@ -1640,7 +1640,8 @@
             "Premium",
             "PerNode",
             "PerGB2018",
-            "Standalone"
+            "Standalone",
+            "CapacityReservation"
           ],
           "x-ms-enum": {
             "name": "SkuNameEnum",
diff --git a/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2015-03-20/OperationalInsights.json b/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2015-03-20/OperationalInsights.json
index eb7579920be1..5cbb27464d08 100644
--- a/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2015-03-20/OperationalInsights.json
+++ b/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2015-03-20/OperationalInsights.json
@@ -641,6 +641,45 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourcegroups/{resourceGroupName}/providers/Microsoft.OperationalInsights/workspaces/{workspaceName}/availableServiceTiers": {
+      "get": {
+        "tags": [
+          "AvailableServiceTiers"
+        ],
+        "x-ms-examples": {
+          "AvailableServiceTiers": {
+            "$ref": "./examples/WorkspacesAvailableServiceTiers.json"
+          }
+        },
+        "operationId": "Workspaces_AvailableServiceTiers",
+        "description": "Gets the available service tiers for the workspace.",
+        "parameters": [
+          {
+            "$ref": "#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/ResourceGroupNameParameter"
+          },
+          {
+            "$ref": "#/parameters/WorkspaceNameParameter"
+          },
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK response definition.",
+            "schema": {
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/AvailableServiceTier"
+              }
+            }
+          }
+        }
+      }
+    },
     "/providers/Microsoft.OperationalInsights/operations": {
       "get": {
         "tags": [
@@ -1285,6 +1324,64 @@
         }
       },
       "description": "The shared keys for a workspace."
+    },
+    "AvailableServiceTier": {
+      "description": "Service Tier details.",
+      "properties": {
+        "ServiceTier": {
+          "readOnly": true,
+          "type": "string",
+          "description": "The name of the Service Tier.",
+          "enum": [
+            "Free",
+            "Standard",
+            "Premium",
+            "PerNode",
+            "PerGB2018",
+            "Standalone",
+            "CapacityReservation"
+          ],
+          "x-ms-enum": {
+            "name": "SkuNameEnum",
+            "modelAsString": true
+          }
+        },
+        "Enabled": {
+          "readOnly": true,
+          "type": "boolean",
+          "description": "True if the Service Tier is enabled for the workspace."
+        },
+        "MinimumRetention": {
+          "readOnly": true,
+          "type": "integer",
+          "format": "int64",
+          "description": "The minimum retention for the Service Tier, in days."
+        },
+        "MaximumRetention": {
+          "readOnly": true,
+          "type": "integer",
+          "format": "int64",
+          "description": "The maximum retention for the Service Tier, in days."
+        },
+        "DefaultRetention": {
+          "readOnly": true,
+          "type": "integer",
+          "format": "int64",
+          "description": "The default retention for the Service Tier, in days."
+        },
+        "CapacityReservationLevel": {
+          "readOnly": true,
+          "type": "integer",
+          "format": "int64",
+          "description": "The capacity reservation level in GB per day. Returned for the Capacity Reservation Service Tier."
+        },
+        "LastSkuUpdate": {
+          "readOnly": true,
+          "type": "string",
+          "format": "date-time",
+          "description": "Time when the sku was last updated for the workspace. Returned for the Capacity Reservation Service Tier."
+        }
+      }
     }
   },
   "parameters": {
diff --git a/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2015-03-20/examples/WorkspacesAvailableServiceTiers.json b/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2015-03-20/examples/WorkspacesAvailableServiceTiers.json
new file mode 100644
index 000000000000..435cf4bb7c47
--- /dev/null
+++ b/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2015-03-20/examples/WorkspacesAvailableServiceTiers.json
@@ -0,0 +1,30 @@
+{
+  "parameters": {
+    "resourceGroupName": "rg1",
+    "workspaceName": "workspace1",
+    "api-version": "2015-03-20",
+    "subscriptionId": "00000000-0000-0000-0000-00000000000"
+  },
+  "responses": {
+    "200": {
+      "body": [
+        {
+          "ServiceTier": "PerNode",
+          "Enabled": true,
+          "MinimumRetention": 7,
+          "MaximumRetention": 30,
+          "DefaultRetention": 7
+        },
+        {
+          "ServiceTier": "CapacityReservation",
+          "Enabled": true,
+          "MinimumRetention": 30,
+          "MaximumRetention": 300,
+          "DefaultRetention": 30,
+          "CapacityReservationLevel": 200,
+          "LastSkuUpdate": "2020-02-04T08:55:03.871Z"
+        }
+      ]
+    }
+  }
+}