diff --git a/fern/apis/api/openapi.json b/fern/apis/api/openapi.json
index 884b2e807..efdee9398 100644
--- a/fern/apis/api/openapi.json
+++ b/fern/apis/api/openapi.json
@@ -6434,6 +6434,7 @@
             "type": "string",
             "description": "This is the OpenAI model that will be used.",
             "enum": [
+              "chatgpt-4o-latest",
               "o3-mini",
               "o1-preview",
               "o1-preview-2024-09-12",
@@ -6466,6 +6467,7 @@
             "type": "array",
             "description": "These are the fallback models that will be used if the primary model fails. This shouldn't be specified unless you have a specific reason to do so. Vapi will automatically find the fastest fallbacks that make sense.",
             "enum": [
+              "chatgpt-4o-latest",
               "o3-mini",
               "o1-preview",
               "o1-preview-2024-09-12",
@@ -6500,6 +6502,7 @@
             "items": {
               "type": "string",
               "enum": [
+                "chatgpt-4o-latest",
                 "o3-mini",
                 "o1-preview",
                 "o1-preview-2024-09-12",
@@ -7618,6 +7621,50 @@
           "voiceId"
         ]
       },
+      "CartesiaExperimentalControls": {
+        "type": "object",
+        "properties": {
+          "speed": {
+            "type": "string",
+            "enum": [
+              "slowest",
+              "slow",
+              "normal",
+              "fast",
+              "fastest"
+            ],
+            "example": "normal"
+          },
+          "emotion": {
+            "type": "string",
+            "enum": [
+              "anger:lowest",
+              "anger:low",
+              "anger:high",
+              "anger:highest",
+              "positivity:lowest",
+              "positivity:low",
+              "positivity:high",
+              "positivity:highest",
+              "surprise:lowest",
+              "surprise:low",
+              "surprise:high",
+              "surprise:highest",
+              "sadness:lowest",
+              "sadness:low",
+              "sadness:high",
+              "sadness:highest",
+              "curiosity:lowest",
+              "curiosity:low",
+              "curiosity:high",
+              "curiosity:highest"
+            ],
+            "example": [
+              "happiness:high"
+            ]
+          }
+        }
+      },
       "CartesiaVoice": {
         "type": "object",
         "properties": {
@@ -7628,6 +7675,10 @@
               "cartesia"
             ]
           },
+          "voiceId": {
+            "type": "string",
+            "description": "The ID of the particular voice you want to use."
+          },
           "model": {
             "type": "string",
             "description": "This is the model that will be used. This is optional and will default to the correct model for the voiceId.",
@@ -7661,6 +7712,14 @@
             ],
             "example": "en"
           },
+          "experimentalControls": {
+            "description": "Experimental controls for Cartesia voice generation",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/CartesiaExperimentalControls"
+              }
+            ]
+          },
           "chunkPlan": {
             "description": "This is the plan for chunking the model output before it is sent to the voice provider.",
             "allOf": [
@@ -7669,10 +7728,6 @@
               }
             ]
           },
-          "voiceId": {
-            "type": "string",
-            "description": "This is the provider-specific ID that will be used."
-          },
           "fallbackPlan": {
             "description": "This is the plan for voice provider fallbacks in the event that the primary voice provider fails.",
             "allOf": [
@@ -8657,6 +8712,10 @@
               "cartesia"
             ]
           },
+          "voiceId": {
+            "type": "string",
+            "description": "The ID of the particular voice you want to use."
+          },
           "model": {
             "type": "string",
             "description": "This is the model that will be used. This is optional and will default to the correct model for the voiceId.",
@@ -8690,9 +8749,13 @@
             ],
             "example": "en"
           },
-          "voiceId": {
-            "type": "string",
-            "description": "This is the provider-specific ID that will be used."
+          "experimentalControls": {
+            "description": "Experimental controls for Cartesia voice generation",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/CartesiaExperimentalControls"
+              }
+            ]
           },
           "chunkPlan": {
             "description": "This is the plan for chunking the model output before it is sent to the voice provider.",