diff --git a/README.md b/README.md
index 1ebbfc2..34c8aff 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ const client = new RealtimeClient({ apiKey: process.env.OPENAI_API_KEY });
 client.updateSession({ instructions: 'You are a great, upbeat friend.' });
 client.updateSession({ voice: 'alloy' });
 client.updateSession({
-  turn_detection: { type: 'none' }, // or 'server_vad'
+  turn_detection: { type: 'none' }, // or 'server_vad' or 'semantic_vad'
   input_audio_transcription: { model: 'whisper-1' },
 });
 
diff --git a/dist/lib/client.d.ts b/dist/lib/client.d.ts
index 7ea2201..24e1a3a 100644
--- a/dist/lib/client.d.ts
+++ b/dist/lib/client.d.ts
@@ -13,6 +13,13 @@
  * @property {number} [prefix_padding_ms]
  * @property {number} [silence_duration_ms]
  */
+/**
+ * @typedef {Object} TurnDetectionSemanticVadType
+ * @property {"semantic_vad"} type
+ * @property {boolean} [create_response]
+ * @property {boolean} [interrupt_response]
+ * @property {"auto"|"low"|"medium"|"high"} [eagerness]
+ */
 /**
  * Tool definitions
  * @typedef {Object} ToolDefinitionType
@@ -30,7 +37,7 @@
  * @property {AudioFormatType} [input_audio_format]
  * @property {AudioFormatType} [output_audio_format]
  * @property {AudioTranscriptionType|null} [input_audio_transcription]
- * @property {TurnDetectionServerVadType|null} [turn_detection]
+ * @property {TurnDetectionServerVadType|TurnDetectionSemanticVadType|null} [turn_detection]
  * @property {ToolDefinitionType[]} [tools]
  * @property {"auto"|"none"|"required"|{type:"function",name:string}} [tool_choice]
  * @property {number} [temperature]
@@ -235,9 +242,9 @@ export class RealtimeClient extends RealtimeEventHandler {
     disconnect(): void;
     /**
      * Gets the active turn detection mode
-     * @returns {"server_vad"|null}
+     * @returns {"server_vad"|"semantic_vad"|null}
      */
-    getTurnDetectionType(): "server_vad" | null;
+    getTurnDetectionType(): "server_vad" | "semantic_vad" | null;
     /**
      * Add a tool and handler
      * @param {ToolDefinitionType} definition
@@ -321,6 +328,12 @@ export type TurnDetectionServerVadType = {
     prefix_padding_ms?: number;
     silence_duration_ms?: number;
 };
+export type TurnDetectionSemanticVadType = {
+    type: "semantic_vad";
+    create_response?: boolean;
+    interrupt_response?: boolean;
+    eagerness?: "auto" | "low" | "medium" | "high";
+};
 /**
  * Tool definitions
  */
@@ -341,7 +354,7 @@ export type SessionResourceType = {
     input_audio_format?: AudioFormatType;
     output_audio_format?: AudioFormatType;
     input_audio_transcription?: AudioTranscriptionType | null;
-    turn_detection?: TurnDetectionServerVadType | null;
+    turn_detection?: TurnDetectionServerVadType | TurnDetectionSemanticVadType | null;
     tools?: ToolDefinitionType[];
     tool_choice?: "auto" | "none" | "required" | {
         type: "function";
diff --git a/lib/api.js b/lib/api.js
index cc8f904..7681c69 100644
--- a/lib/api.js
+++ b/lib/api.js
@@ -56,7 +56,7 @@ export class RealtimeAPI extends RealtimeEventHandler {
    * @param {{model?: string}} [settings]
    * @returns {Promise<true>}
    */
-  async connect({ model } = { model: 'gpt-4o-realtime-preview-2024-10-01' }) {
+  async connect({ model } = { model: 'gpt-4o-realtime-preview-2024-12-17' }) {
     if (!this.apiKey && this.url === this.defaultUrl) {
       console.warn(`No apiKey provided for connection to "${this.url}"`);
     }
@@ -73,7 +73,10 @@ export class RealtimeAPI extends RealtimeEventHandler {
         );
       }
       const WebSocket = globalThis.WebSocket;
-      const ws = new WebSocket(`${this.url}${model ? `?model=${model}` : ''}`, [
+      const url = new URL(this.url);
+      url.searchParams.set('model', model);
+
+      const ws = new WebSocket(url.toString(), [
         'realtime',
         `openai-insecure-api-key.${this.apiKey}`,
         'openai-beta.realtime-v1',
@@ -113,7 +116,7 @@ export class RealtimeAPI extends RealtimeEventHandler {
       const wsModule = await import(/* webpackIgnore: true */ moduleName);
       const WebSocket = wsModule.default;
       const ws = new WebSocket(
-        'wss://api.openai.com/v1/realtime?model=gpt-4o-realtime-preview-2024-10-01',
+        `wss://api.openai.com/v1/realtime?model=${model}`,
         [],
         {
           finishRequest: (request) => {
diff --git a/lib/client.js b/lib/client.js
index 2c48d7f..ec34813 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -21,6 +21,14 @@ import { RealtimeUtils } from './utils.js';
  * @property {number} [silence_duration_ms]
  */
 
+/**
+ * @typedef {Object} TurnDetectionSemanticVadType
+ * @property {"semantic_vad"} type
+ * @property {boolean} [create_response]
+ * @property {boolean} [interrupt_response]
+ * @property {"auto"|"low"|"medium"|"high"} [eagerness]
+ */
+
 /**
  * Tool definitions
  * @typedef {Object} ToolDefinitionType
@@ -39,7 +47,7 @@ import { RealtimeUtils } from './utils.js';
  * @property {AudioFormatType} [input_audio_format]
  * @property {AudioFormatType} [output_audio_format]
  * @property {AudioTranscriptionType|null} [input_audio_transcription]
- * @property {TurnDetectionServerVadType|null} [turn_detection]
+ * @property {TurnDetectionServerVadType|TurnDetectionSemanticVadType|null} [turn_detection]
  * @property {ToolDefinitionType[]} [tools]
  * @property {"auto"|"none"|"required"|{type:"function",name:string}} [tool_choice]
  * @property {number} [temperature]
@@ -218,6 +226,12 @@ export class RealtimeClient extends RealtimeEventHandler {
       prefix_padding_ms: 300, // How much audio to include in the audio stream before the speech starts.
       silence_duration_ms: 200, // How long to wait to mark the speech as stopped.
     };
+    this.defaultSemanticVadConfig = {
+      type: 'semantic_vad',
+      create_response: true,
+      interrupt_response: false,
+      eagerness: 'auto',
+    };
     this.realtime = new RealtimeAPI({
       url,
       apiKey,
@@ -423,7 +437,7 @@ export class RealtimeClient extends RealtimeEventHandler {
 
   /**
    * Gets the active turn detection mode
-   * @returns {"server_vad"|null}
+   * @returns {"server_vad"|"semantic_vad"|null}
    */
   getTurnDetectionType() {
     return this.sessionConfig.turn_detection?.type || null;
@@ -504,8 +518,24 @@ export class RealtimeClient extends RealtimeEventHandler {
     input_audio_transcription !== void 0 &&
       (this.sessionConfig.input_audio_transcription =
         input_audio_transcription);
-    turn_detection !== void 0 &&
-      (this.sessionConfig.turn_detection = turn_detection);
+    
+    // Apply turn detection config with defaults if needed
+    if (turn_detection !== void 0) {
+      if (turn_detection?.type === 'semantic_vad') {
+        this.sessionConfig.turn_detection = {
+          ...this.defaultSemanticVadConfig,
+          ...turn_detection,
+        };
+      } else if (turn_detection?.type === 'server_vad') {
+        this.sessionConfig.turn_detection = {
+          ...this.defaultServerVadConfig,
+          ...turn_detection,
+        };
+      } else {
+        this.sessionConfig.turn_detection = turn_detection;
+      }
+    }
+
     tools !== void 0 && (this.sessionConfig.tools = tools);
     tool_choice !== void 0 && (this.sessionConfig.tool_choice = tool_choice);
     temperature !== void 0 && (this.sessionConfig.temperature = temperature);