diff --git a/fern/apis/api/openapi.json b/fern/apis/api/openapi.json
index 91508f86..e72110aa 100644
--- a/fern/apis/api/openapi.json
+++ b/fern/apis/api/openapi.json
@@ -6212,6 +6212,63 @@
           }
         }
       },
+      "TurnLatency": {
+        "type": "object",
+        "properties": {
+          "modelLatency": {
+            "type": "number",
+            "description": "This is the model latency for the first token."
+          },
+          "voiceLatency": {
+            "type": "number",
+            "description": "This is the voice latency from the model output."
+          },
+          "transcriberLatency": {
+            "type": "number",
+            "description": "This is the transcriber latency from the user speech."
+          },
+          "endpointingLatency": {
+            "type": "number",
+            "description": "This is the endpointing latency."
+          },
+          "turnLatency": {
+            "type": "number",
+            "description": "This is the latency for the whole turn."
+          }
+        }
+      },
+      "PerformanceMetrics": {
+        "type": "object",
+        "properties": {
+          "turnLatencies": {
+            "description": "These are the individual latencies for each turn.",
+            "type": "array",
+            "items": {
+              "$ref": "#/components/schemas/TurnLatency"
+            }
+          },
+          "modelLatencyAverage": {
+            "type": "number",
+            "description": "This is the average latency for the model to output the first token."
+          },
+          "voiceLatencyAverage": {
+            "type": "number",
+            "description": "This is the average latency for the text to speech."
+          },
+          "transcriberLatencyAverage": {
+            "type": "number",
+            "description": "This is the average latency for the transcriber."
+          },
+          "endpointingLatencyAverage": {
+            "type": "number",
+            "description": "This is the average latency for the endpointing."
+          },
+          "turnLatencyAverage": {
+            "type": "number",
+            "description": "This is the average latency for complete turns."
+          }
+        }
+      },
       "Artifact": {
         "type": "object",
         "properties": {
@@ -6300,6 +6357,14 @@
           "variableValues": {
             "type": "object",
             "description": "These are the variable values at the end of the workflow execution."
+          },
+          "performanceMetrics": {
+            "description": "This is the performance metrics for the call. It contains the turn latency, broken down by component.",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/PerformanceMetrics"
+              }
+            ]
           }
         }
       },