diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.JsonConverters.TranslationConfigType.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.JsonConverters.TranslationConfigType.g.cs
new file mode 100644
index 0000000..f4ecf2e
--- /dev/null
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.JsonConverters.TranslationConfigType.g.cs
@@ -0,0 +1,53 @@
+#nullable enable
+
+namespace Soniox.Realtime.JsonConverters
+{
+    /// <inheritdoc />
+    public sealed class TranslationConfigTypeJsonConverter : global::System.Text.Json.Serialization.JsonConverter<global::Soniox.Realtime.TranslationConfigType>
+    {
+        /// <inheritdoc />
+        public override global::Soniox.Realtime.TranslationConfigType Read(
+            ref global::System.Text.Json.Utf8JsonReader reader,
+            global::System.Type typeToConvert,
+            global::System.Text.Json.JsonSerializerOptions options)
+        {
+            switch (reader.TokenType)
+            {
+                case global::System.Text.Json.JsonTokenType.String:
+                {
+                    var stringValue = reader.GetString();
+                    if (stringValue != null)
+                    {
+                        return global::Soniox.Realtime.TranslationConfigTypeExtensions.ToEnum(stringValue) ?? default;
+                    }
+                    
+                    break;
+                }
+                case global::System.Text.Json.JsonTokenType.Number:
+                {
+                    var numValue = reader.GetInt32();
+                    return (global::Soniox.Realtime.TranslationConfigType)numValue;
+                }
+                case global::System.Text.Json.JsonTokenType.Null:
+                {
+                    return default(global::Soniox.Realtime.TranslationConfigType);
+                }
+                default:
+                    throw new global::System.ArgumentOutOfRangeException(nameof(reader));
+            }
+
+            return default;
+        }
+
+        /// <inheritdoc />
+        public override void Write(
+            global::System.Text.Json.Utf8JsonWriter writer,
+            global::Soniox.Realtime.TranslationConfigType value,
+            global::System.Text.Json.JsonSerializerOptions options)
+        {
+            writer = writer ?? throw new global::System.ArgumentNullException(nameof(writer));
+
+            writer.WriteStringValue(global::Soniox.Realtime.TranslationConfigTypeExtensions.ToValueString(value));
+        }
+    }
+}
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.JsonConverters.TranslationConfigTypeNullable.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.JsonConverters.TranslationConfigTypeNullable.g.cs
new file mode 100644
index 0000000..ace1f1c
--- /dev/null
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.JsonConverters.TranslationConfigTypeNullable.g.cs
@@ -0,0 +1,60 @@
+#nullable enable
+
+namespace Soniox.Realtime.JsonConverters
+{
+    /// <inheritdoc />
+    public sealed class TranslationConfigTypeNullableJsonConverter : global::System.Text.Json.Serialization.JsonConverter<global::Soniox.Realtime.TranslationConfigType?>
+    {
+        /// <inheritdoc />
+        public override global::Soniox.Realtime.TranslationConfigType? Read(
+            ref global::System.Text.Json.Utf8JsonReader reader,
+            global::System.Type typeToConvert,
+            global::System.Text.Json.JsonSerializerOptions options)
+        {
+            switch (reader.TokenType)
+            {
+                case global::System.Text.Json.JsonTokenType.String:
+                {
+                    var stringValue = reader.GetString();
+                    if (stringValue != null)
+                    {
+                        return global::Soniox.Realtime.TranslationConfigTypeExtensions.ToEnum(stringValue);
+                    }
+                    
+                    break;
+                }
+                case global::System.Text.Json.JsonTokenType.Number:
+                {
+                    var numValue = reader.GetInt32();
+                    return (global::Soniox.Realtime.TranslationConfigType)numValue;
+                }
+                case global::System.Text.Json.JsonTokenType.Null:
+                {
+                    return default(global::Soniox.Realtime.TranslationConfigType?);
+                }
+                default:
+                    throw new global::System.ArgumentOutOfRangeException(nameof(reader));
+            }
+
+            return default;
+        }
+
+        /// <inheritdoc />
+        public override void Write(
+            global::System.Text.Json.Utf8JsonWriter writer,
+            global::Soniox.Realtime.TranslationConfigType? value,
+            global::System.Text.Json.JsonSerializerOptions options)
+        {
+            writer = writer ?? throw new global::System.ArgumentNullException(nameof(writer));
+
+            if (value == null)
+            {
+                writer.WriteNullValue();
+            }
+            else
+            {
+                writer.WriteStringValue(global::Soniox.Realtime.TranslationConfigTypeExtensions.ToValueString(value.Value));
+            }
+        }
+    }
+}
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.JsonSerializerContext.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.JsonSerializerContext.g.cs
index a7e6d0f..63557c9 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.JsonSerializerContext.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.JsonSerializerContext.g.cs
@@ -13,6 +13,10 @@ namespace Soniox.Realtime
         DefaultIgnoreCondition = global::System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull,
         Converters = new global::System.Type[]
         {
+            typeof(global::Soniox.Realtime.JsonConverters.TranslationConfigTypeJsonConverter),
+
+            typeof(global::Soniox.Realtime.JsonConverters.TranslationConfigTypeNullableJsonConverter),
+
             typeof(global::Soniox.Realtime.JsonConverters.ServerEventJsonConverter),
 
             typeof(global::Soniox.Realtime.JsonConverters.OneOfJsonConverter<string, object>),
@@ -27,6 +31,7 @@ namespace Soniox.Realtime
     [global::System.Text.Json.Serialization.JsonSerializable(typeof(object))]
     [global::System.Text.Json.Serialization.JsonSerializable(typeof(double))]
     [global::System.Text.Json.Serialization.JsonSerializable(typeof(global::Soniox.Realtime.TranslationConfig))]
+    [global::System.Text.Json.Serialization.JsonSerializable(typeof(global::Soniox.Realtime.TranslationConfigType), TypeInfoPropertyName = "TranslationConfigType2")]
     [global::System.Text.Json.Serialization.JsonSerializable(typeof(global::Soniox.Realtime.RealtimeToken))]
     [global::System.Text.Json.Serialization.JsonSerializable(typeof(global::Soniox.Realtime.RealtimeResult))]
     [global::System.Text.Json.Serialization.JsonSerializable(typeof(global::System.Collections.Generic.IList<global::Soniox.Realtime.RealtimeToken>))]
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.JsonSerializerContextTypes.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.JsonSerializerContextTypes.g.cs
index 51f28e3..8d726c3 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.JsonSerializerContextTypes.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.JsonSerializerContextTypes.g.cs
@@ -64,23 +64,27 @@ public sealed partial class JsonSerializerContextTypes
         /// <summary>
         /// 
         /// </summary>
-        public global::Soniox.Realtime.RealtimeToken? Type9 { get; set; }
+        public global::Soniox.Realtime.TranslationConfigType? Type9 { get; set; }
         /// <summary>
         /// 
         /// </summary>
-        public global::Soniox.Realtime.RealtimeResult? Type10 { get; set; }
+        public global::Soniox.Realtime.RealtimeToken? Type10 { get; set; }
         /// <summary>
         /// 
         /// </summary>
-        public global::System.Collections.Generic.IList<global::Soniox.Realtime.RealtimeToken>? Type11 { get; set; }
+        public global::Soniox.Realtime.RealtimeResult? Type11 { get; set; }
         /// <summary>
         /// 
         /// </summary>
-        public global::Soniox.Realtime.RealtimeError? Type12 { get; set; }
+        public global::System.Collections.Generic.IList<global::Soniox.Realtime.RealtimeToken>? Type12 { get; set; }
         /// <summary>
         /// 
         /// </summary>
-        public global::Soniox.Realtime.ServerEvent? Type13 { get; set; }
+        public global::Soniox.Realtime.RealtimeError? Type13 { get; set; }
+        /// <summary>
+        /// 
+        /// </summary>
+        public global::Soniox.Realtime.ServerEvent? Type14 { get; set; }
 
         /// <summary>
         /// 
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Models.RealtimeConfig.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Models.RealtimeConfig.g.cs
index 14ea93f..fcc7b06 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Models.RealtimeConfig.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Models.RealtimeConfig.g.cs
@@ -12,19 +12,22 @@ public sealed partial class RealtimeConfig
         /// Soniox API key. Permanent and temporary API keys are supported.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("api_key")]
-        public string? ApiKey { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string ApiKey { get; set; }
 
         /// <summary>
         /// Realtime STT model id, for example stt-rt-v5.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("model")]
-        public string? Model { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string Model { get; set; }
 
         /// <summary>
         /// Audio format; use auto for containerized streams or raw_* values with sample_rate.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("audio_format")]
-        public string? AudioFormat { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string AudioFormat { get; set; }
 
         /// <summary>
         /// Sample rate in Hz for raw audio.
@@ -164,9 +167,9 @@ public sealed partial class RealtimeConfig
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public RealtimeConfig(
-            string? apiKey,
-            string? model,
-            string? audioFormat,
+            string apiKey,
+            string model,
+            string audioFormat,
             int? sampleRate,
             int? numChannels,
             global::System.Collections.Generic.IList<string>? languageHints,
@@ -181,9 +184,9 @@ public RealtimeConfig(
             global::Soniox.Realtime.TranslationConfig? translation,
             string? clientReferenceId)
         {
-            this.ApiKey = apiKey;
-            this.Model = model;
-            this.AudioFormat = audioFormat;
+            this.ApiKey = apiKey ?? throw new global::System.ArgumentNullException(nameof(apiKey));
+            this.Model = model ?? throw new global::System.ArgumentNullException(nameof(model));
+            this.AudioFormat = audioFormat ?? throw new global::System.ArgumentNullException(nameof(audioFormat));
             this.SampleRate = sampleRate;
             this.NumChannels = numChannels;
             this.LanguageHints = languageHints;
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Models.RealtimeError.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Models.RealtimeError.g.cs
index 0173e96..6e604c5 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Models.RealtimeError.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Models.RealtimeError.g.cs
@@ -12,13 +12,15 @@ public sealed partial class RealtimeError
         /// 
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("error_code")]
-        public int? ErrorCode { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required int ErrorCode { get; set; }
 
         /// <summary>
         /// 
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("error_message")]
-        public string? ErrorMessage { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string ErrorMessage { get; set; }
 
         /// <summary>
         /// Additional properties that are not explicitly defined in the schema
@@ -35,11 +37,11 @@ public sealed partial class RealtimeError
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public RealtimeError(
-            int? errorCode,
-            string? errorMessage)
+            int errorCode,
+            string errorMessage)
         {
             this.ErrorCode = errorCode;
-            this.ErrorMessage = errorMessage;
+            this.ErrorMessage = errorMessage ?? throw new global::System.ArgumentNullException(nameof(errorMessage));
         }
 
         /// <summary>
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Models.TranslationConfig.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Models.TranslationConfig.g.cs
index 809b018..29bd929 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Models.TranslationConfig.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Models.TranslationConfig.g.cs
@@ -12,7 +12,9 @@ public sealed partial class TranslationConfig
         /// 
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("type")]
-        public string? Type { get; set; }
+        [global::System.Text.Json.Serialization.JsonConverter(typeof(global::Soniox.Realtime.JsonConverters.TranslationConfigTypeJsonConverter))]
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required global::Soniox.Realtime.TranslationConfigType Type { get; set; }
 
         /// <summary>
         /// 
@@ -49,7 +51,7 @@ public sealed partial class TranslationConfig
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public TranslationConfig(
-            string? type,
+            global::Soniox.Realtime.TranslationConfigType type,
             string? targetLanguage,
             string? languageA,
             string? languageB)
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Models.TranslationConfigType.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Models.TranslationConfigType.g.cs
new file mode 100644
index 0000000..fc612d0
--- /dev/null
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Models.TranslationConfigType.g.cs
@@ -0,0 +1,51 @@
+
+#nullable enable
+
+namespace Soniox.Realtime
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public enum TranslationConfigType
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        OneWay,
+        /// <summary>
+        /// 
+        /// </summary>
+        TwoWay,
+    }
+
+    /// <summary>
+    /// Enum extensions to do fast conversions without the reflection.
+    /// </summary>
+    public static class TranslationConfigTypeExtensions
+    {
+        /// <summary>
+        /// Converts an enum to a string.
+        /// </summary>
+        public static string ToValueString(this TranslationConfigType value)
+        {
+            return value switch
+            {
+                TranslationConfigType.OneWay => "one_way",
+                TranslationConfigType.TwoWay => "two_way",
+                _ => throw new global::System.ArgumentOutOfRangeException(nameof(value), value, null),
+            };
+        }
+        /// <summary>
+        /// Converts an string to a enum.
+        /// </summary>
+        public static TranslationConfigType? ToEnum(string value)
+        {
+            return value switch
+            {
+                "one_way" => TranslationConfigType.OneWay,
+                "two_way" => TranslationConfigType.TwoWay,
+                _ => null,
+            };
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsAudio.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsAudio.g.cs
index 5c1e7c0..aa1e87d 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsAudio.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsAudio.g.cs
@@ -12,7 +12,8 @@ public sealed partial class TtsAudio
         /// Stream identifier this audio belongs to.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("stream_id")]
-        public string? StreamId { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string StreamId { get; set; }
 
         /// <summary>
         /// Base64-encoded audio bytes.
@@ -55,12 +56,12 @@ public sealed partial class TtsAudio
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public TtsAudio(
-            string? streamId,
+            string streamId,
             string? audio,
             bool? audioEnd,
             global::Soniox.Realtime.Tts.TtsTimestamps? timestamps)
         {
-            this.StreamId = streamId;
+            this.StreamId = streamId ?? throw new global::System.ArgumentNullException(nameof(streamId));
             this.Audio = audio;
             this.AudioEnd = audioEnd;
             this.Timestamps = timestamps;
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsCancel.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsCancel.g.cs
index 5683f52..bfe39e6 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsCancel.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsCancel.g.cs
@@ -12,13 +12,15 @@ public sealed partial class TtsCancel
         /// Stream identifier to cancel.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("stream_id")]
-        public string? StreamId { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string StreamId { get; set; }
 
         /// <summary>
         /// True to cancel the active stream.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("cancel")]
-        public bool? Cancel { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required bool Cancel { get; set; }
 
         /// <summary>
         /// Additional properties that are not explicitly defined in the schema
@@ -39,10 +41,10 @@ public sealed partial class TtsCancel
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public TtsCancel(
-            string? streamId,
-            bool? cancel)
+            string streamId,
+            bool cancel)
         {
-            this.StreamId = streamId;
+            this.StreamId = streamId ?? throw new global::System.ArgumentNullException(nameof(streamId));
             this.Cancel = cancel;
         }
 
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsConfig.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsConfig.g.cs
index c92fe69..d86380d 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsConfig.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsConfig.g.cs
@@ -12,38 +12,45 @@ public sealed partial class TtsConfig
         /// Soniox API key. Permanent and temporary API keys are supported.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("api_key")]
-        public string? ApiKey { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string ApiKey { get; set; }
 
         /// <summary>
         /// Client-generated stream identifier unique among active streams on the connection.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("stream_id")]
-        public string? StreamId { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string StreamId { get; set; }
 
         /// <summary>
         /// Text-to-Speech model id, for example tts-rt-v2.<br/>
         /// Default Value: tts-rt-v2
         /// </summary>
+        /// <default>"tts-rt-v2"</default>
         [global::System.Text.Json.Serialization.JsonPropertyName("model")]
-        public string? Model { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string Model { get; set; } = "tts-rt-v2";
 
         /// <summary>
         /// Input language code.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("language")]
-        public string? Language { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string Language { get; set; }
 
         /// <summary>
         /// Built-in voice name or cloned voice id.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("voice")]
-        public string? Voice { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string Voice { get; set; }
 
         /// <summary>
         /// Output audio format, for example wav, mp3, opus, flac, or raw PCM formats.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("audio_format")]
-        public string? AudioFormat { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string AudioFormat { get; set; }
 
         /// <summary>
         /// Optional output sample rate in Hz.
@@ -122,24 +129,24 @@ public sealed partial class TtsConfig
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public TtsConfig(
-            string? apiKey,
-            string? streamId,
-            string? model,
-            string? language,
-            string? voice,
-            string? audioFormat,
+            string apiKey,
+            string streamId,
+            string model,
+            string language,
+            string voice,
+            string audioFormat,
             int? sampleRate,
             int? bitrate,
             string? clientReferenceId,
             bool? returnTimestamps,
             double? speed)
         {
-            this.ApiKey = apiKey;
-            this.StreamId = streamId;
-            this.Model = model;
-            this.Language = language;
-            this.Voice = voice;
-            this.AudioFormat = audioFormat;
+            this.ApiKey = apiKey ?? throw new global::System.ArgumentNullException(nameof(apiKey));
+            this.StreamId = streamId ?? throw new global::System.ArgumentNullException(nameof(streamId));
+            this.Model = model ?? throw new global::System.ArgumentNullException(nameof(model));
+            this.Language = language ?? throw new global::System.ArgumentNullException(nameof(language));
+            this.Voice = voice ?? throw new global::System.ArgumentNullException(nameof(voice));
+            this.AudioFormat = audioFormat ?? throw new global::System.ArgumentNullException(nameof(audioFormat));
             this.SampleRate = sampleRate;
             this.Bitrate = bitrate;
             this.ClientReferenceId = clientReferenceId;
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsError.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsError.g.cs
index f23256a..9fa0de4 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsError.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsError.g.cs
@@ -18,19 +18,22 @@ public sealed partial class TtsError
         /// HTTP-style status code.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("error_code")]
-        public int? ErrorCode { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required int ErrorCode { get; set; }
 
         /// <summary>
         /// Stable machine-readable error category.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("error_type")]
-        public string? ErrorType { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string ErrorType { get; set; }
 
         /// <summary>
         /// Human-readable error message.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("error_message")]
-        public string? ErrorMessage { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string ErrorMessage { get; set; }
 
         /// <summary>
         /// Optional documentation URL with additional information.
@@ -53,9 +56,6 @@ public sealed partial class TtsError
         /// <summary>
         /// Initializes a new instance of the <see cref="TtsError" /> class.
         /// </summary>
-        /// <param name="streamId">
-        /// Stream identifier for stream-scoped errors.
-        /// </param>
         /// <param name="errorCode">
         /// HTTP-style status code.
         /// </param>
@@ -65,6 +65,9 @@ public sealed partial class TtsError
         /// <param name="errorMessage">
         /// Human-readable error message.
         /// </param>
+        /// <param name="streamId">
+        /// Stream identifier for stream-scoped errors.
+        /// </param>
         /// <param name="moreInfo">
         /// Optional documentation URL with additional information.
         /// </param>
@@ -75,17 +78,17 @@ public sealed partial class TtsError
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public TtsError(
+            int errorCode,
+            string errorType,
+            string errorMessage,
             string? streamId,
-            int? errorCode,
-            string? errorType,
-            string? errorMessage,
             string? moreInfo,
             string? requestId)
         {
             this.StreamId = streamId;
             this.ErrorCode = errorCode;
-            this.ErrorType = errorType;
-            this.ErrorMessage = errorMessage;
+            this.ErrorType = errorType ?? throw new global::System.ArgumentNullException(nameof(errorType));
+            this.ErrorMessage = errorMessage ?? throw new global::System.ArgumentNullException(nameof(errorMessage));
             this.MoreInfo = moreInfo;
             this.RequestId = requestId;
         }
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsKeepAlive.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsKeepAlive.g.cs
index 1ebfdf0..fb04563 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsKeepAlive.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsKeepAlive.g.cs
@@ -12,7 +12,8 @@ public sealed partial class TtsKeepAlive
         /// True to keep an already-authenticated WebSocket connection alive.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("keep_alive")]
-        public bool? KeepAlive { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required bool KeepAlive { get; set; }
 
         /// <summary>
         /// Additional properties that are not explicitly defined in the schema
@@ -30,7 +31,7 @@ public sealed partial class TtsKeepAlive
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public TtsKeepAlive(
-            bool? keepAlive)
+            bool keepAlive)
         {
             this.KeepAlive = keepAlive;
         }
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsTerminated.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsTerminated.g.cs
index 0833df4..992d271 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsTerminated.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsTerminated.g.cs
@@ -12,13 +12,15 @@ public sealed partial class TtsTerminated
         /// Stream identifier whose lifecycle has completed.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("stream_id")]
-        public string? StreamId { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string StreamId { get; set; }
 
         /// <summary>
         /// True when the server has released stream resources.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("terminated")]
-        public bool? Terminated { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required bool Terminated { get; set; }
 
         /// <summary>
         /// Additional properties that are not explicitly defined in the schema
@@ -39,10 +41,10 @@ public sealed partial class TtsTerminated
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public TtsTerminated(
-            string? streamId,
-            bool? terminated)
+            string streamId,
+            bool terminated)
         {
-            this.StreamId = streamId;
+            this.StreamId = streamId ?? throw new global::System.ArgumentNullException(nameof(streamId));
             this.Terminated = terminated;
         }
 
diff --git a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsText.g.cs b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsText.g.cs
index 137f40f..4031e41 100644
--- a/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsText.g.cs
+++ b/src/libs/Soniox/Generated/Soniox.Realtime.Tts.Models.TtsText.g.cs
@@ -12,19 +12,22 @@ public sealed partial class TtsText
         /// Stream identifier to append text to.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("stream_id")]
-        public string? StreamId { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string StreamId { get; set; }
 
         /// <summary>
         /// Text chunk to synthesize.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("text")]
-        public string? Text { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required string Text { get; set; }
 
         /// <summary>
         /// True when this is the final text chunk for the stream.
         /// </summary>
         [global::System.Text.Json.Serialization.JsonPropertyName("text_end")]
-        public bool? TextEnd { get; set; }
+        [global::System.Text.Json.Serialization.JsonRequired]
+        public required bool TextEnd { get; set; }
 
         /// <summary>
         /// Additional properties that are not explicitly defined in the schema
@@ -48,12 +51,12 @@ public sealed partial class TtsText
         [global::System.Diagnostics.CodeAnalysis.SetsRequiredMembers]
 #endif
         public TtsText(
-            string? streamId,
-            string? text,
-            bool? textEnd)
+            string streamId,
+            string text,
+            bool textEnd)
         {
-            this.StreamId = streamId;
-            this.Text = text;
+            this.StreamId = streamId ?? throw new global::System.ArgumentNullException(nameof(streamId));
+            this.Text = text ?? throw new global::System.ArgumentNullException(nameof(text));
             this.TextEnd = textEnd;
         }