diff --git a/src/libs/StepFun/Generated/StepFun.AudioClient.CreateSpeech.g.cs b/src/libs/StepFun/Generated/StepFun.AudioClient.CreateSpeech.g.cs
index de40e8e..7ff336c 100644
--- a/src/libs/StepFun/Generated/StepFun.AudioClient.CreateSpeech.g.cs
+++ b/src/libs/StepFun/Generated/StepFun.AudioClient.CreateSpeech.g.cs
@@ -367,17 +367,15 @@ partial void ProcessCreateSpeechResponseContent(
                                 }
                                 catch (global::System.Exception __ex)
                                 {
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
                             else
@@ -414,17 +412,15 @@ partial void ProcessCreateSpeechResponseContent(
                                     {
                                     }
 
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
 
diff --git a/src/libs/StepFun/Generated/StepFun.ChatClient.CreateChatCompletion.g.cs b/src/libs/StepFun/Generated/StepFun.ChatClient.CreateChatCompletion.g.cs
index 3b2c742..0d7c71e 100644
--- a/src/libs/StepFun/Generated/StepFun.ChatClient.CreateChatCompletion.g.cs
+++ b/src/libs/StepFun/Generated/StepFun.ChatClient.CreateChatCompletion.g.cs
@@ -367,17 +367,15 @@ partial void ProcessCreateChatCompletionResponseContent(
                                 }
                                 catch (global::System.Exception __ex)
                                 {
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
                             else
@@ -414,17 +412,15 @@ partial void ProcessCreateChatCompletionResponseContent(
                                     {
                                     }
 
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
 
diff --git a/src/libs/StepFun/Generated/StepFun.Exceptions.g.cs b/src/libs/StepFun/Generated/StepFun.Exceptions.g.cs
index 43f562f..91d5636 100644
--- a/src/libs/StepFun/Generated/StepFun.Exceptions.g.cs
+++ b/src/libs/StepFun/Generated/StepFun.Exceptions.g.cs
@@ -12,16 +12,19 @@ public partial class ApiException : global::System.Exception
         /// The HTTP status code of the response.
         /// </summary>
         public global::System.Net.HttpStatusCode StatusCode { get; }
+
         /// <summary>
         /// The response body as a string, or <c>null</c> if the body could not be read.
         /// This is always populated for error responses regardless of the <c>ReadResponseAsString</c> setting.
         /// For success-path failures (e.g. deserialization errors), the client attempts a best-effort read.
         /// </summary>
         public string? ResponseBody { get; set; }
+
         /// <summary>
         /// The response headers.
         /// </summary>
         public global::System.Collections.Generic.Dictionary<string, global::System.Collections.Generic.IEnumerable<string>>? ResponseHeaders { get; set; }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="ApiException"/> class.
         /// </summary>
@@ -49,6 +52,103 @@ public ApiException(string message, global::System.Exception? innerException, gl
         {
             StatusCode = statusCode;
         }
+
+        /// <summary>
+        /// Constructs an <see cref="ApiException"/> instance whose runtime type matches the response status code when the typed exception hierarchy is enabled. Always returns a plain <see cref="ApiException"/> when the hierarchy is disabled.
+        /// </summary>
+        /// <param name="statusCode">The HTTP status code of the response.</param>
+        /// <param name="message">The error message.</param>
+        /// <param name="innerException">An inner exception, when one is available.</param>
+        /// <param name="responseHeaders">The response headers; consulted for 429 <c>Retry-After</c> parsing when present.</param>
+        public static global::StepFun.ApiException Create(
+            global::System.Net.HttpStatusCode statusCode,
+            string message,
+            global::System.Exception? innerException = null,
+            global::System.Collections.Generic.IDictionary<string, global::System.Collections.Generic.IEnumerable<string>>? responseHeaders = null)
+        {
+            return new global::StepFun.ApiException(message, innerException, statusCode);
+        }
+
+        /// <summary>
+        /// Convenience overload that constructs an <see cref="ApiException"/> with response body and headers populated.
+        /// </summary>
+        public static global::StepFun.ApiException Create(
+            global::System.Net.HttpStatusCode statusCode,
+            string message,
+            global::System.Exception? innerException,
+            string? responseBody,
+            global::System.Collections.Generic.Dictionary<string, global::System.Collections.Generic.IEnumerable<string>>? responseHeaders)
+        {
+            var exception = global::StepFun.ApiException.Create(statusCode, message, innerException, responseHeaders);
+            exception.ResponseBody = responseBody;
+            exception.ResponseHeaders = responseHeaders;
+            return exception;
+        }
+
+        /// <summary>
+        /// Parses a <c>Retry-After</c> response header (delta-seconds or HTTP-date) into a <see cref="global::System.TimeSpan"/>.
+        /// Returns <c>null</c> when the header is missing or unparseable. Public so consumer code that observes
+        /// <see cref="ApiException"/> directly can recover the value without re-implementing the parser.
+        /// </summary>
+        public static global::System.TimeSpan? TryParseRetryAfter(
+            global::System.Collections.Generic.IDictionary<string, global::System.Collections.Generic.IEnumerable<string>>? headers)
+        {
+            if (headers == null)
+            {
+                return null;
+            }
+
+            global::System.Collections.Generic.IEnumerable<string>? values = null;
+            foreach (var entry in headers)
+            {
+                if (string.Equals(entry.Key, "Retry-After", global::System.StringComparison.OrdinalIgnoreCase))
+                {
+                    values = entry.Value;
+                    break;
+                }
+            }
+
+            if (values == null)
+            {
+                return null;
+            }
+
+            string? raw = null;
+            foreach (var value in values)
+            {
+                if (!string.IsNullOrWhiteSpace(value))
+                {
+                    raw = value.Trim();
+                    break;
+                }
+            }
+
+            if (string.IsNullOrEmpty(raw))
+            {
+                return null;
+            }
+
+            if (int.TryParse(
+                raw,
+                global::System.Globalization.NumberStyles.Integer,
+                global::System.Globalization.CultureInfo.InvariantCulture,
+                out var seconds) && seconds >= 0)
+            {
+                return global::System.TimeSpan.FromSeconds(seconds);
+            }
+
+            if (global::System.DateTimeOffset.TryParse(
+                raw,
+                global::System.Globalization.CultureInfo.InvariantCulture,
+                global::System.Globalization.DateTimeStyles.AssumeUniversal | global::System.Globalization.DateTimeStyles.AdjustToUniversal,
+                out var when))
+            {
+                var delta = when - global::System.DateTimeOffset.UtcNow;
+                return delta > global::System.TimeSpan.Zero ? delta : global::System.TimeSpan.Zero;
+            }
+
+            return null;
+        }
     }
 
     /// <summary>
@@ -88,5 +188,39 @@ public ApiException(string message, global::System.Net.HttpStatusCode statusCode
         public ApiException(string message, global::System.Exception? innerException, global::System.Net.HttpStatusCode statusCode) : base(message, innerException, statusCode)
         {
         }
+
+        /// <summary>
+        /// Constructs an <see cref="ApiException{T}"/> whose runtime type matches the response status code when the typed exception hierarchy is enabled.
+        /// </summary>
+        /// <param name="statusCode">The HTTP status code of the response.</param>
+        /// <param name="message">The error message.</param>
+        /// <param name="innerException">An inner exception, when one is available.</param>
+        /// <param name="responseHeaders">The response headers; consulted for 429 <c>Retry-After</c> parsing when present.</param>
+        public static new global::StepFun.ApiException<T> Create(
+            global::System.Net.HttpStatusCode statusCode,
+            string message,
+            global::System.Exception? innerException = null,
+            global::System.Collections.Generic.IDictionary<string, global::System.Collections.Generic.IEnumerable<string>>? responseHeaders = null)
+        {
+            return new global::StepFun.ApiException<T>(message, innerException, statusCode);
+        }
+
+        /// <summary>
+        /// Convenience overload that constructs an <see cref="ApiException{T}"/> with response body, object, and headers populated.
+        /// </summary>
+        public static global::StepFun.ApiException<T> Create(
+            global::System.Net.HttpStatusCode statusCode,
+            string message,
+            global::System.Exception? innerException,
+            string? responseBody,
+            T? responseObject,
+            global::System.Collections.Generic.Dictionary<string, global::System.Collections.Generic.IEnumerable<string>>? responseHeaders)
+        {
+            var exception = global::StepFun.ApiException<T>.Create(statusCode, message, innerException, responseHeaders);
+            exception.ResponseBody = responseBody;
+            exception.ResponseObject = responseObject;
+            exception.ResponseHeaders = responseHeaders;
+            return exception;
+        }
     }
 }
\ No newline at end of file
diff --git a/src/libs/StepFun/Generated/StepFun.ModelsClient.ListModels.g.cs b/src/libs/StepFun/Generated/StepFun.ModelsClient.ListModels.g.cs
index 77daadd..3c3209d 100644
--- a/src/libs/StepFun/Generated/StepFun.ModelsClient.ListModels.g.cs
+++ b/src/libs/StepFun/Generated/StepFun.ModelsClient.ListModels.g.cs
@@ -347,17 +347,15 @@ partial void ProcessListModelsResponseContent(
                                 }
                                 catch (global::System.Exception __ex)
                                 {
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
                             else
@@ -394,17 +392,15 @@ partial void ProcessListModelsResponseContent(
                                     {
                                     }
 
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
 
diff --git a/src/libs/StepFun/Generated/StepFun.ModelsClient.RetrieveModel.g.cs b/src/libs/StepFun/Generated/StepFun.ModelsClient.RetrieveModel.g.cs
index daeece7..77494ea 100644
--- a/src/libs/StepFun/Generated/StepFun.ModelsClient.RetrieveModel.g.cs
+++ b/src/libs/StepFun/Generated/StepFun.ModelsClient.RetrieveModel.g.cs
@@ -356,17 +356,15 @@ partial void ProcessRetrieveModelResponseContent(
                                 }
                                 catch (global::System.Exception __ex)
                                 {
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
                             else
@@ -403,17 +401,15 @@ partial void ProcessRetrieveModelResponseContent(
                                     {
                                     }
 
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
 
diff --git a/src/libs/StepFun/Generated/StepFun.TokensClient.CountTokens.g.cs b/src/libs/StepFun/Generated/StepFun.TokensClient.CountTokens.g.cs
index ff6c1cc..4323e8f 100644
--- a/src/libs/StepFun/Generated/StepFun.TokensClient.CountTokens.g.cs
+++ b/src/libs/StepFun/Generated/StepFun.TokensClient.CountTokens.g.cs
@@ -367,17 +367,15 @@ partial void ProcessCountTokensResponseContent(
                                 }
                                 catch (global::System.Exception __ex)
                                 {
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }
                             else
@@ -414,17 +412,15 @@ partial void ProcessCountTokensResponseContent(
                                     {
                                     }
 
-                                    throw new global::StepFun.ApiException(
+                                    throw global::StepFun.ApiException.Create(
+                                        statusCode: __response.StatusCode,
                                         message: __content ?? __response.ReasonPhrase ?? string.Empty,
                                         innerException: __ex,
-                                        statusCode: __response.StatusCode)
-                                    {
-                                        ResponseBody = __content,
-                                        ResponseHeaders = global::System.Linq.Enumerable.ToDictionary(
+                                        responseBody: __content,
+                                        responseHeaders: global::System.Linq.Enumerable.ToDictionary(
                                             __response.Headers,
                                             h => h.Key,
-                                            h => h.Value),
-                                    };
+                                            h => h.Value));
                                 }
                             }