diff --git a/fern/apis/api/openapi.json b/fern/apis/api/openapi.json
index 0ed495eee..5ec2bc197 100644
--- a/fern/apis/api/openapi.json
+++ b/fern/apis/api/openapi.json
@@ -4815,9 +4815,15 @@
         "parameters": [
           {
             "name": "purpose",
-            "required": true,
+            "required": false,
             "in": "query",
+            "description": "Only return files with this purpose. When omitted, files of every purpose except composer attachments are returned.",
             "schema": {
+              "enum": [
+                "assistant",
+                "composer-attachment",
+                "knowledge-base-v2"
+              ],
               "type": "string"
             }
           }
@@ -36124,7 +36130,7 @@
           },
           "replacementModel": {
             "type": "string",
-            "description": "The recommended migration target for the slot's model: the registry's\nreplacement, followed through any further retirements as of the response\ndate, so it names a model that is alive on that day. A `<model>:<region>`\npin on the slot's model is kept on the target.",
+            "description": "The recommended migration target for the slot's model: the registry's\nreplacement, followed through any further retirements as of the response\ndate, so it names a model that is alive on that day. A `<model>:<region>`\npin on the slot's model is kept on the target when the pinned name is\nitself a settable model; otherwise the bare replacement is named.",
             "example": "gpt-5"
           }
         },
@@ -46948,6 +46954,8 @@
               "call.in-progress.error-providerfault-outbound-sip-503-service-unavailable",
               "call.in-progress.error-providerfault-outbound-sip-480-temporarily-unavailable",
               "call.in-progress.error-sip-outbound-call-failed-to-connect",
+              "sip-outbound-unallocated-number",
+              "sip-outbound-carrier-released-call",
               "call.ringing.hook-executed-say",
               "call.ringing.hook-executed-transfer",
               "call.ending.hook-executed-say",
@@ -63237,6 +63245,7 @@
               "assistant.model.tokenReceived",
               "assistant.model.responseSucceeded",
               "assistant.model.responseFailed",
+              "assistant.model.responseEmpty",
               "assistant.model.toolCallsReceived",
               "assistant.model.reconnecting",
               "assistant.model.cleanup",
@@ -66344,6 +66353,15 @@
           "platformFee": {
             "type": "number",
             "description": "This is the platform fee for the subscription."
+          },
+          "billingCollectionMethod": {
+            "type": "string",
+            "nullable": true,
+            "description": "This is how payment is collected for the subscription: charged to the card\non file, or invoiced.",
+            "enum": [
+              "charge_automatically",
+              "send_invoice"
+            ]
           }
         },
         "required": [
@@ -76949,6 +76967,8 @@
               "call.in-progress.error-providerfault-outbound-sip-503-service-unavailable",
               "call.in-progress.error-providerfault-outbound-sip-480-temporarily-unavailable",
               "call.in-progress.error-sip-outbound-call-failed-to-connect",
+              "sip-outbound-unallocated-number",
+              "sip-outbound-carrier-released-call",
               "call.ringing.hook-executed-say",
               "call.ringing.hook-executed-transfer",
               "call.ending.hook-executed-say",
@@ -78402,6 +78422,8 @@
               "call.in-progress.error-providerfault-outbound-sip-503-service-unavailable",
               "call.in-progress.error-providerfault-outbound-sip-480-temporarily-unavailable",
               "call.in-progress.error-sip-outbound-call-failed-to-connect",
+              "sip-outbound-unallocated-number",
+              "sip-outbound-carrier-released-call",
               "call.ringing.hook-executed-say",
               "call.ringing.hook-executed-transfer",
               "call.ending.hook-executed-say",