diff --git a/api/kotlin-sdk.api b/api/kotlin-sdk.api
index cd74e0cd..a82600a8 100644
--- a/api/kotlin-sdk.api
+++ b/api/kotlin-sdk.api
@@ -1,3 +1,34 @@
+public final class io/modelcontextprotocol/kotlin/sdk/AudioContent : io/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal {
+	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/AudioContent$Companion;
+	public static final field TYPE Ljava/lang/String;
+	public fun <init> (Ljava/lang/String;Ljava/lang/String;)V
+	public final fun component1 ()Ljava/lang/String;
+	public final fun component2 ()Ljava/lang/String;
+	public final fun copy (Ljava/lang/String;Ljava/lang/String;)Lio/modelcontextprotocol/kotlin/sdk/AudioContent;
+	public static synthetic fun copy$default (Lio/modelcontextprotocol/kotlin/sdk/AudioContent;Ljava/lang/String;Ljava/lang/String;ILjava/lang/Object;)Lio/modelcontextprotocol/kotlin/sdk/AudioContent;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getData ()Ljava/lang/String;
+	public final fun getMimeType ()Ljava/lang/String;
+	public fun getType ()Ljava/lang/String;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+}
+
+public synthetic class io/modelcontextprotocol/kotlin/sdk/AudioContent$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+	public static final field INSTANCE Lio/modelcontextprotocol/kotlin/sdk/AudioContent$$serializer;
+	public final fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public final fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lio/modelcontextprotocol/kotlin/sdk/AudioContent;
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public final fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public final fun serialize (Lkotlinx/serialization/encoding/Encoder;Lio/modelcontextprotocol/kotlin/sdk/AudioContent;)V
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
+}
+
+public final class io/modelcontextprotocol/kotlin/sdk/AudioContent$Companion {
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
 public final class io/modelcontextprotocol/kotlin/sdk/BlobResourceContents : io/modelcontextprotocol/kotlin/sdk/ResourceContents {
 	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/BlobResourceContents$Companion;
 	public fun <init> (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
@@ -413,17 +444,17 @@ public final class io/modelcontextprotocol/kotlin/sdk/CreateMessageRequest$Inclu
 
 public final class io/modelcontextprotocol/kotlin/sdk/CreateMessageResult : io/modelcontextprotocol/kotlin/sdk/ClientResult {
 	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/CreateMessageResult$Companion;
-	public fun <init> (Ljava/lang/String;Lio/modelcontextprotocol/kotlin/sdk/StopReason;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;Lkotlinx/serialization/json/JsonObject;)V
-	public synthetic fun <init> (Ljava/lang/String;Lio/modelcontextprotocol/kotlin/sdk/StopReason;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;Lkotlinx/serialization/json/JsonObject;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public fun <init> (Ljava/lang/String;Lio/modelcontextprotocol/kotlin/sdk/StopReason;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;Lkotlinx/serialization/json/JsonObject;)V
+	public synthetic fun <init> (Ljava/lang/String;Lio/modelcontextprotocol/kotlin/sdk/StopReason;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;Lkotlinx/serialization/json/JsonObject;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public final fun component1 ()Ljava/lang/String;
 	public final fun component2 ()Lio/modelcontextprotocol/kotlin/sdk/StopReason;
 	public final fun component3 ()Lio/modelcontextprotocol/kotlin/sdk/Role;
-	public final fun component4 ()Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;
+	public final fun component4 ()Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;
 	public final fun component5 ()Lkotlinx/serialization/json/JsonObject;
-	public final fun copy (Ljava/lang/String;Lio/modelcontextprotocol/kotlin/sdk/StopReason;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;Lkotlinx/serialization/json/JsonObject;)Lio/modelcontextprotocol/kotlin/sdk/CreateMessageResult;
-	public static synthetic fun copy$default (Lio/modelcontextprotocol/kotlin/sdk/CreateMessageResult;Ljava/lang/String;Lio/modelcontextprotocol/kotlin/sdk/StopReason;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;Lkotlinx/serialization/json/JsonObject;ILjava/lang/Object;)Lio/modelcontextprotocol/kotlin/sdk/CreateMessageResult;
+	public final fun copy (Ljava/lang/String;Lio/modelcontextprotocol/kotlin/sdk/StopReason;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;Lkotlinx/serialization/json/JsonObject;)Lio/modelcontextprotocol/kotlin/sdk/CreateMessageResult;
+	public static synthetic fun copy$default (Lio/modelcontextprotocol/kotlin/sdk/CreateMessageResult;Ljava/lang/String;Lio/modelcontextprotocol/kotlin/sdk/StopReason;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;Lkotlinx/serialization/json/JsonObject;ILjava/lang/Object;)Lio/modelcontextprotocol/kotlin/sdk/CreateMessageResult;
 	public fun equals (Ljava/lang/Object;)Z
-	public final fun getContent ()Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;
+	public final fun getContent ()Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;
 	public final fun getModel ()Ljava/lang/String;
 	public final fun getRole ()Lio/modelcontextprotocol/kotlin/sdk/Role;
 	public final fun getStopReason ()Lio/modelcontextprotocol/kotlin/sdk/StopReason;
@@ -663,7 +694,7 @@ public final class io/modelcontextprotocol/kotlin/sdk/GetPromptResult$Companion
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
-public final class io/modelcontextprotocol/kotlin/sdk/ImageContent : io/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage {
+public final class io/modelcontextprotocol/kotlin/sdk/ImageContent : io/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal {
 	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/ImageContent$Companion;
 	public static final field TYPE Ljava/lang/String;
 	public fun <init> (Ljava/lang/String;Ljava/lang/String;)V
@@ -1669,11 +1700,11 @@ public final class io/modelcontextprotocol/kotlin/sdk/PromptMessageContent$Compa
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
-public abstract interface class io/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage : io/modelcontextprotocol/kotlin/sdk/PromptMessageContent {
-	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage$Companion;
+public abstract interface class io/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal : io/modelcontextprotocol/kotlin/sdk/PromptMessageContent {
+	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal$Companion;
 }
 
-public final class io/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage$Companion {
+public final class io/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal$Companion {
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
@@ -2079,13 +2110,13 @@ public final class io/modelcontextprotocol/kotlin/sdk/RootsListChangedNotificati
 
 public final class io/modelcontextprotocol/kotlin/sdk/SamplingMessage {
 	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/SamplingMessage$Companion;
-	public fun <init> (Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;)V
+	public fun <init> (Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;)V
 	public final fun component1 ()Lio/modelcontextprotocol/kotlin/sdk/Role;
-	public final fun component2 ()Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;
-	public final fun copy (Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;)Lio/modelcontextprotocol/kotlin/sdk/SamplingMessage;
-	public static synthetic fun copy$default (Lio/modelcontextprotocol/kotlin/sdk/SamplingMessage;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;ILjava/lang/Object;)Lio/modelcontextprotocol/kotlin/sdk/SamplingMessage;
+	public final fun component2 ()Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;
+	public final fun copy (Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;)Lio/modelcontextprotocol/kotlin/sdk/SamplingMessage;
+	public static synthetic fun copy$default (Lio/modelcontextprotocol/kotlin/sdk/SamplingMessage;Lio/modelcontextprotocol/kotlin/sdk/Role;Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;ILjava/lang/Object;)Lio/modelcontextprotocol/kotlin/sdk/SamplingMessage;
 	public fun equals (Ljava/lang/Object;)Z
-	public final fun getContent ()Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage;
+	public final fun getContent ()Lio/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal;
 	public final fun getRole ()Lio/modelcontextprotocol/kotlin/sdk/Role;
 	public fun hashCode ()I
 	public fun toString ()Ljava/lang/String;
@@ -2344,7 +2375,7 @@ public final class io/modelcontextprotocol/kotlin/sdk/SubscribeRequest$Companion
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
-public final class io/modelcontextprotocol/kotlin/sdk/TextContent : io/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage {
+public final class io/modelcontextprotocol/kotlin/sdk/TextContent : io/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal {
 	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/TextContent$Companion;
 	public static final field TYPE Ljava/lang/String;
 	public fun <init> ()V
@@ -2503,7 +2534,7 @@ public final class io/modelcontextprotocol/kotlin/sdk/Types_utilKt {
 	public static synthetic fun ok$default (Lio/modelcontextprotocol/kotlin/sdk/CallToolResult$Companion;Ljava/lang/String;Lkotlinx/serialization/json/JsonObject;ILjava/lang/Object;)Lio/modelcontextprotocol/kotlin/sdk/CallToolResult;
 }
 
-public final class io/modelcontextprotocol/kotlin/sdk/UnknownContent : io/modelcontextprotocol/kotlin/sdk/PromptMessageContentTextOrImage {
+public final class io/modelcontextprotocol/kotlin/sdk/UnknownContent : io/modelcontextprotocol/kotlin/sdk/PromptMessageContentMultimodal {
 	public static final field Companion Lio/modelcontextprotocol/kotlin/sdk/UnknownContent$Companion;
 	public fun <init> (Ljava/lang/String;)V
 	public final fun component1 ()Ljava/lang/String;
diff --git a/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.kt b/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.kt
index c69d2d27..e8606a84 100644
--- a/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.kt
+++ b/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.kt
@@ -897,10 +897,10 @@ public sealed interface PromptMessageContent {
 }
 
 /**
- * Represents prompt message content that is either text or an image.
+ * Represents prompt message content that is either text, image or audio.
  */
-@Serializable(with = PromptMessageContentTextOrImagePolymorphicSerializer::class)
-public sealed interface PromptMessageContentTextOrImage : PromptMessageContent
+@Serializable(with = PromptMessageContentMultimodalPolymorphicSerializer::class)
+public sealed interface PromptMessageContentMultimodal : PromptMessageContent
 
 /**
  * Text provided to or from an LLM.
@@ -911,7 +911,7 @@ public data class TextContent(
      * The text content of the message.
      */
     val text: String? = null,
-) : PromptMessageContentTextOrImage {
+) : PromptMessageContentMultimodal {
     override val type: String = TYPE
 
     public companion object {
@@ -933,7 +933,7 @@ public data class ImageContent(
      * The MIME type of the image. Different providers may support different image types.
      */
     val mimeType: String,
-) : PromptMessageContentTextOrImage {
+) : PromptMessageContentMultimodal {
     override val type: String = TYPE
 
     public companion object {
@@ -942,12 +942,35 @@ public data class ImageContent(
 }
 
 /**
- * An image provided to or from an LLM.
+ * Audio provided to or from an LLM.
+ */
+@Serializable
+public data class AudioContent(
+    /**
+     * The base64-encoded audio data.
+     */
+    val data: String,
+
+    /**
+     * The MIME type of the audio. Different providers may support different audio types.
+     */
+    val mimeType: String,
+) : PromptMessageContentMultimodal {
+    override val type: String = TYPE
+
+    public companion object {
+        public const val TYPE: String = "audio"
+    }
+}
+
+
+/**
+ * Unknown content provided to or from an LLM.
  */
 @Serializable
 public data class UnknownContent(
     override val type: String,
-) : PromptMessageContentTextOrImage
+) : PromptMessageContentMultimodal
 
 /**
  * The contents of a resource, embedded into a prompt or tool call result.
@@ -1217,7 +1240,7 @@ public class ModelPreferences(
 @Serializable
 public data class SamplingMessage(
     val role: Role,
-    val content: PromptMessageContentTextOrImage,
+    val content: PromptMessageContentMultimodal,
 )
 
 /**
@@ -1299,7 +1322,7 @@ public data class CreateMessageResult(
      */
     val stopReason: StopReason? = null,
     val role: Role,
-    val content: PromptMessageContentTextOrImage,
+    val content: PromptMessageContentMultimodal,
     override val _meta: JsonObject = EmptyJsonObject,
 ) : ClientResult
 
diff --git a/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.util.kt b/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.util.kt
index e93abde3..8a4dcd25 100644
--- a/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.util.kt
+++ b/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/types.util.kt
@@ -80,17 +80,19 @@ internal object PromptMessageContentPolymorphicSerializer :
             ImageContent.TYPE -> ImageContent.serializer()
             TextContent.TYPE -> TextContent.serializer()
             EmbeddedResource.TYPE -> EmbeddedResource.serializer()
+            AudioContent.TYPE -> AudioContent.serializer()
             else -> UnknownContent.serializer()
         }
     }
 }
 
-internal object PromptMessageContentTextOrImagePolymorphicSerializer :
-    JsonContentPolymorphicSerializer<PromptMessageContentTextOrImage>(PromptMessageContentTextOrImage::class) {
-    override fun selectDeserializer(element: JsonElement): DeserializationStrategy<PromptMessageContentTextOrImage> {
+internal object PromptMessageContentMultimodalPolymorphicSerializer :
+    JsonContentPolymorphicSerializer<PromptMessageContentMultimodal>(PromptMessageContentMultimodal::class) {
+    override fun selectDeserializer(element: JsonElement): DeserializationStrategy<PromptMessageContentMultimodal> {
         return when (element.jsonObject.getValue("type").jsonPrimitive.content) {
             ImageContent.TYPE -> ImageContent.serializer()
             TextContent.TYPE -> TextContent.serializer()
+            AudioContent.TYPE -> AudioContent.serializer()
             else -> UnknownContent.serializer()
         }
     }
diff --git a/src/commonTest/kotlin/AudioContentSerializationTest.kt b/src/commonTest/kotlin/AudioContentSerializationTest.kt
new file mode 100644
index 00000000..6745972c
--- /dev/null
+++ b/src/commonTest/kotlin/AudioContentSerializationTest.kt
@@ -0,0 +1,34 @@
+package io.modelcontextprotocol.kotlin.sdk
+
+import io.kotest.assertions.json.shouldEqualJson
+import io.modelcontextprotocol.kotlin.sdk.shared.McpJson
+import kotlinx.serialization.encodeToString
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class AudioContentSerializationTest {
+
+    private val audioContentJson = """
+        {
+          "data": "base64-encoded-audio-data",
+           "mimeType": "audio/wav",
+          "type": "audio"
+        }
+    """.trimIndent()
+
+    private val audioContent = AudioContent(
+        data = "base64-encoded-audio-data",
+        mimeType = "audio/wav"
+    )
+
+    @Test
+    fun `should serialize audio content`() {
+        McpJson.encodeToString(audioContent) shouldEqualJson audioContentJson
+    }
+
+    @Test
+    fun `should deserialize audio content`() {
+        val content = McpJson.decodeFromString<AudioContent>(audioContentJson)
+        assertEquals(expected = audioContent, actual = content)
+    }
+}
\ No newline at end of file