diff --git a/CHANGELOG.md b/CHANGELOG.md
index d444df27..be762442 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## Unreleased
+
+### Added
+
+- **Audio**: add `timestampGranularities`
+
 ## 3.7.0
 
 ### Added
diff --git a/openai-client/src/commonMain/kotlin/com.aallam.openai.client/internal/api/AudioApi.kt b/openai-client/src/commonMain/kotlin/com.aallam.openai.client/internal/api/AudioApi.kt
index 6006880e..81c6e3b6 100644
--- a/openai-client/src/commonMain/kotlin/com.aallam.openai.client/internal/api/AudioApi.kt
+++ b/openai-client/src/commonMain/kotlin/com.aallam.openai.client/internal/api/AudioApi.kt
@@ -61,6 +61,11 @@ internal class AudioApi(val requester: HttpRequester) : Audio {
         request.responseFormat?.let { append(key = "response_format", value = it.value) }
         request.temperature?.let { append(key = "temperature", value = it) }
         request.language?.let { append(key = "language", value = it) }
+        if (request.responseFormat == AudioResponseFormat.VerboseJson) {
+            for (timestampGranularity in request.timestampGranularities) {
+                append(key = "timestamp_granularities[]", value = timestampGranularity.value)
+            }
+        }
     }
 
     @BetaOpenAI
diff --git a/openai-client/src/commonTest/kotlin/com/aallam/openai/client/TestAudio.kt b/openai-client/src/commonTest/kotlin/com/aallam/openai/client/TestAudio.kt
index 0696a267..fcc8fc75 100644
--- a/openai-client/src/commonTest/kotlin/com/aallam/openai/client/TestAudio.kt
+++ b/openai-client/src/commonTest/kotlin/com/aallam/openai/client/TestAudio.kt
@@ -55,6 +55,22 @@ class TestAudio : TestOpenAI() {
         assertTrue { transcription.segments?.isNotEmpty() ?: false }
     }
 
+    @Test
+    fun transcriptionWithWordTimestamps() = test {
+        val request = transcriptionRequest {
+            audio = FileSource(path = testFilePath("audio/micro-machines.wav"), fileSystem = TestFileSystem)
+            model = ModelId("whisper-1")
+            responseFormat = AudioResponseFormat.VerboseJson
+            timestampGranularities = listOf(TimestampGranularity.Word)
+        }
+        val transcription = openAI.transcription(request)
+        assertTrue { transcription.text.isNotEmpty() }
+        assertEquals(transcription.language, "english")
+        assertEquals(transcription.duration!!, 29.88, absoluteTolerance = 0.1)
+        assertEquals(transcription.segments, null)
+        assertTrue { transcription.words?.isNotEmpty() ?: false }
+    }
+
     @Test
     fun translation() = test {
         val request = translationRequest {
diff --git a/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/TimestampGranularity.kt b/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/TimestampGranularity.kt
new file mode 100644
index 00000000..dc4b5a20
--- /dev/null
+++ b/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/TimestampGranularity.kt
@@ -0,0 +1,13 @@
+package com.aallam.openai.api.audio
+
+import kotlinx.serialization.Serializable
+import kotlin.jvm.JvmInline
+
+@Serializable
+@JvmInline
+public value class TimestampGranularity(public val value: String) {
+    public companion object {
+        public val Word: TimestampGranularity = TimestampGranularity("word")
+        public val Segment: TimestampGranularity = TimestampGranularity("segment")
+    }
+}
diff --git a/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/Transcription.kt b/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/Transcription.kt
index 35a6bc80..9ac88a20 100644
--- a/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/Transcription.kt
+++ b/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/Transcription.kt
@@ -20,4 +20,5 @@ public data class Transcription(
     @SerialName("language") val language: String? = null,
     @SerialName("duration") val duration: Double? = null,
     @SerialName("segments") val segments: List<Segment>? = null,
+    @SerialName("words") val words: List<Word>? = null,
 )
diff --git a/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/TranscriptionRequest.kt b/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/TranscriptionRequest.kt
index 9288583a..1967cac1 100644
--- a/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/TranscriptionRequest.kt
+++ b/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/TranscriptionRequest.kt
@@ -43,6 +43,14 @@ public class TranscriptionRequest(
      * [ISO-639-1](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) format will improve accuracy and latency.
      */
     public val language: String? = null,
+
+    /**
+     * The timestamp granularities to populate for this transcription.
+     * responseFormat must be set verbose_json to use timestamp granularities.
+     * Either or both of these options are supported: word, or segment.
+     * Note: There is no additional latency for segment timestamps, but generating word timestamps incurs additional latency.
+     */
+    public val timestampGranularities: List<TimestampGranularity> = emptyList(),
 )
 
 /**
@@ -90,6 +98,14 @@ public class TranscriptionRequestBuilder {
      */
     public var language: String? = null
 
+    /**
+     * The timestamp granularities to populate for this transcription.
+     * responseFormat must be set verbose_json to use timestamp granularities.
+     * Either or both of these options are supported: word, or segment.
+     * Note: There is no additional latency for segment timestamps, but generating word timestamps incurs additional latency.
+     */
+    public var timestampGranularities: List<TimestampGranularity> = emptyList()
+
     /**
      * Builder of [TranscriptionRequest] instances.
      */
@@ -100,5 +116,6 @@ public class TranscriptionRequestBuilder {
         responseFormat = responseFormat,
         temperature = temperature,
         language = language,
+        timestampGranularities = timestampGranularities,
     )
 }
diff --git a/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/Word.kt b/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/Word.kt
new file mode 100644
index 00000000..94287a6b
--- /dev/null
+++ b/openai-core/src/commonMain/kotlin/com.aallam.openai.api/audio/Word.kt
@@ -0,0 +1,11 @@
+package com.aallam.openai.api.audio
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+public data class Word(
+    @SerialName("word") val word: String,
+    @SerialName("start") val start: Double,
+    @SerialName("end") val end: Double,
+)