diff --git a/src/main/java/com/google/genai/Batches.java b/src/main/java/com/google/genai/Batches.java
index d5cf780500e..f1b78c905f7 100644
--- a/src/main/java/com/google/genai/Batches.java
+++ b/src/main/java/com/google/genai/Batches.java
@@ -64,6 +64,53 @@ public Batches(ApiClient apiClient) {
     this.apiClient = apiClient;
   }
 
+  @ExcludeFromGeneratedCoverageReport
+  ObjectNode audioTranscriptionConfigToMldev(JsonNode fromObject, ObjectNode parentObject) {
+    ObjectNode toObject = JsonSerializable.objectMapper().createObjectNode();
+    if (!Common.isZero(Common.getValueByPath(fromObject, new String[] {"languageCodes"}))) {
+      throw new IllegalArgumentException(
+          "languageCodes parameter is only supported in Gemini Enterprise Agent Platform mode, not"
+              + " in Gemini Developer API mode.");
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"languageAuto"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"languageAuto"},
+          Common.getValueByPath(fromObject, new String[] {"languageAuto"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"languageHints"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"languageHints"},
+          Common.getValueByPath(fromObject, new String[] {"languageHints"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"adaptationPhrases"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"adaptationPhrases"},
+          Common.getValueByPath(fromObject, new String[] {"adaptationPhrases"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"wordTimestamp"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"wordTimestamp"},
+          Common.getValueByPath(fromObject, new String[] {"wordTimestamp"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"diarization"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"diarization"},
+          Common.getValueByPath(fromObject, new String[] {"diarization"}));
+    }
+
+    return toObject;
+  }
+
   @ExcludeFromGeneratedCoverageReport
   ObjectNode authConfigToMldev(JsonNode fromObject, ObjectNode parentObject) {
     ObjectNode toObject = JsonSerializable.objectMapper().createObjectNode();
@@ -1430,6 +1477,16 @@ ObjectNode generateContentConfigToMldev(
           Common.getValueByPath(fromObject, new String[] {"serviceTier"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscriptionConfig"},
+          audioTranscriptionConfigToMldev(
+              JsonSerializable.toJsonNode(
+                  Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"})),
+              toObject));
+    }
+
     return toObject;
   }
 
@@ -1966,6 +2023,13 @@ ObjectNode partToMldev(JsonNode fromObject, ObjectNode parentObject) {
           Common.getValueByPath(fromObject, new String[] {"partMetadata"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscription"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscription"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscription"}));
+    }
+
     return toObject;
   }
 
diff --git a/src/main/java/com/google/genai/Caches.java b/src/main/java/com/google/genai/Caches.java
index ca3b25b67e4..2ff1752daee 100644
--- a/src/main/java/com/google/genai/Caches.java
+++ b/src/main/java/com/google/genai/Caches.java
@@ -959,6 +959,13 @@ ObjectNode partToMldev(JsonNode fromObject, ObjectNode parentObject) {
           Common.getValueByPath(fromObject, new String[] {"partMetadata"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscription"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscription"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscription"}));
+    }
+
     return toObject;
   }
 
@@ -1066,6 +1073,13 @@ ObjectNode partToVertex(JsonNode fromObject, ObjectNode parentObject) {
               + " Enterprise Agent Platform mode.");
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscription"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscription"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscription"}));
+    }
+
     return toObject;
   }
 
diff --git a/src/main/java/com/google/genai/LiveConverters.java b/src/main/java/com/google/genai/LiveConverters.java
index a3c6ee7776a..a20e60f8287 100644
--- a/src/main/java/com/google/genai/LiveConverters.java
+++ b/src/main/java/com/google/genai/LiveConverters.java
@@ -61,6 +61,20 @@ ObjectNode audioTranscriptionConfigToMldev(JsonNode fromObject, ObjectNode paren
           Common.getValueByPath(fromObject, new String[] {"adaptationPhrases"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"wordTimestamp"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"wordTimestamp"},
+          Common.getValueByPath(fromObject, new String[] {"wordTimestamp"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"diarization"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"diarization"},
+          Common.getValueByPath(fromObject, new String[] {"diarization"}));
+    }
+
     return toObject;
   }
 
@@ -518,6 +532,13 @@ ObjectNode generationConfigToVertex(JsonNode fromObject, ObjectNode parentObject
               + " Gemini Enterprise Agent Platform mode.");
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscriptionConfig"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}));
+    }
+
     return toObject;
   }
 
@@ -1907,6 +1928,13 @@ ObjectNode partToMldev(JsonNode fromObject, ObjectNode parentObject) {
           Common.getValueByPath(fromObject, new String[] {"partMetadata"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscription"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscription"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscription"}));
+    }
+
     return toObject;
   }
 
@@ -2014,6 +2042,13 @@ ObjectNode partToVertex(JsonNode fromObject, ObjectNode parentObject) {
               + " Enterprise Agent Platform mode.");
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscription"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscription"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscription"}));
+    }
+
     return toObject;
   }
 
diff --git a/src/main/java/com/google/genai/Models.java b/src/main/java/com/google/genai/Models.java
index 5540fd8b7dd..f520bb26ea0 100644
--- a/src/main/java/com/google/genai/Models.java
+++ b/src/main/java/com/google/genai/Models.java
@@ -144,6 +144,54 @@ void videoGenerationReferenceTypeMldevEnumValidate(Object enumValue) {
     }
   }
 
+  @ExcludeFromGeneratedCoverageReport
+  ObjectNode audioTranscriptionConfigToMldev(
+      JsonNode fromObject, ObjectNode parentObject, JsonNode rootObject) {
+    ObjectNode toObject = JsonSerializable.objectMapper().createObjectNode();
+    if (!Common.isZero(Common.getValueByPath(fromObject, new String[] {"languageCodes"}))) {
+      throw new IllegalArgumentException(
+          "languageCodes parameter is only supported in Gemini Enterprise Agent Platform mode, not"
+              + " in Gemini Developer API mode.");
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"languageAuto"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"languageAuto"},
+          Common.getValueByPath(fromObject, new String[] {"languageAuto"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"languageHints"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"languageHints"},
+          Common.getValueByPath(fromObject, new String[] {"languageHints"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"adaptationPhrases"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"adaptationPhrases"},
+          Common.getValueByPath(fromObject, new String[] {"adaptationPhrases"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"wordTimestamp"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"wordTimestamp"},
+          Common.getValueByPath(fromObject, new String[] {"wordTimestamp"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"diarization"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"diarization"},
+          Common.getValueByPath(fromObject, new String[] {"diarization"}));
+    }
+
+    return toObject;
+  }
+
   @ExcludeFromGeneratedCoverageReport
   ObjectNode authConfigToMldev(JsonNode fromObject, ObjectNode parentObject, JsonNode rootObject) {
     ObjectNode toObject = JsonSerializable.objectMapper().createObjectNode();
@@ -1746,6 +1794,17 @@ ObjectNode generateContentConfigToMldev(
           Common.getValueByPath(fromObject, new String[] {"serviceTier"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscriptionConfig"},
+          audioTranscriptionConfigToMldev(
+              JsonSerializable.toJsonNode(
+                  Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"})),
+              toObject,
+              rootObject));
+    }
+
     return toObject;
   }
 
@@ -1998,6 +2057,13 @@ ObjectNode generateContentConfigToVertex(
           Common.getValueByPath(fromObject, new String[] {"serviceTier"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscriptionConfig"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}));
+    }
+
     return toObject;
   }
 
@@ -3568,6 +3634,13 @@ ObjectNode generationConfigToVertex(
               + " Gemini Enterprise Agent Platform mode.");
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscriptionConfig"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}));
+    }
+
     return toObject;
   }
 
@@ -4401,6 +4474,13 @@ ObjectNode partToMldev(JsonNode fromObject, ObjectNode parentObject, JsonNode ro
           Common.getValueByPath(fromObject, new String[] {"partMetadata"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscription"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscription"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscription"}));
+    }
+
     return toObject;
   }
 
@@ -4510,6 +4590,13 @@ ObjectNode partToVertex(JsonNode fromObject, ObjectNode parentObject, JsonNode r
               + " Enterprise Agent Platform mode.");
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscription"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscription"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscription"}));
+    }
+
     return toObject;
   }
 
diff --git a/src/main/java/com/google/genai/TokensConverters.java b/src/main/java/com/google/genai/TokensConverters.java
index 54fb3cc9254..afa5aa387d4 100644
--- a/src/main/java/com/google/genai/TokensConverters.java
+++ b/src/main/java/com/google/genai/TokensConverters.java
@@ -61,6 +61,20 @@ ObjectNode audioTranscriptionConfigToMldev(JsonNode fromObject, ObjectNode paren
           Common.getValueByPath(fromObject, new String[] {"adaptationPhrases"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"wordTimestamp"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"wordTimestamp"},
+          Common.getValueByPath(fromObject, new String[] {"wordTimestamp"}));
+    }
+
+    if (Common.getValueByPath(fromObject, new String[] {"diarization"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"diarization"},
+          Common.getValueByPath(fromObject, new String[] {"diarization"}));
+    }
+
     return toObject;
   }
 
@@ -679,6 +693,13 @@ ObjectNode partToMldev(JsonNode fromObject, ObjectNode parentObject) {
           Common.getValueByPath(fromObject, new String[] {"partMetadata"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscription"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscription"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscription"}));
+    }
+
     return toObject;
   }
 
diff --git a/src/main/java/com/google/genai/Tunings.java b/src/main/java/com/google/genai/Tunings.java
index b54595a3470..2de93d0d9cc 100644
--- a/src/main/java/com/google/genai/Tunings.java
+++ b/src/main/java/com/google/genai/Tunings.java
@@ -1226,6 +1226,13 @@ ObjectNode generationConfigFromVertex(
           Common.getValueByPath(fromObject, new String[] {"responseFormat"}));
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscriptionConfig"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}));
+    }
+
     return toObject;
   }
 
@@ -1411,6 +1418,13 @@ ObjectNode generationConfigToVertex(
               + " Gemini Enterprise Agent Platform mode.");
     }
 
+    if (Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}) != null) {
+      Common.setValueByPath(
+          toObject,
+          new String[] {"audioTranscriptionConfig"},
+          Common.getValueByPath(fromObject, new String[] {"audioTranscriptionConfig"}));
+    }
+
     return toObject;
   }
 
diff --git a/src/main/java/com/google/genai/types/AudioTranscriptionConfig.java b/src/main/java/com/google/genai/types/AudioTranscriptionConfig.java
index ae12e6af68c..ce82903eff0 100644
--- a/src/main/java/com/google/genai/types/AudioTranscriptionConfig.java
+++ b/src/main/java/com/google/genai/types/AudioTranscriptionConfig.java
@@ -51,6 +51,14 @@ public abstract class AudioTranscriptionConfig extends JsonSerializable {
   @JsonProperty("adaptationPhrases")
   public abstract Optional<List<String>> adaptationPhrases();
 
+  /** Configures word-level timestamp generation. */
+  @JsonProperty("wordTimestamp")
+  public abstract Optional<Boolean> wordTimestamp();
+
+  /** Configures speaker diarization. */
+  @JsonProperty("diarization")
+  public abstract Optional<Boolean> diarization();
+
   /** Instantiates a builder for AudioTranscriptionConfig. */
   @ExcludeFromGeneratedCoverageReport
   public static Builder builder() {
@@ -187,6 +195,42 @@ public Builder clearAdaptationPhrases() {
       return adaptationPhrases(Optional.empty());
     }
 
+    /**
+     * Setter for wordTimestamp.
+     *
+     * <p>wordTimestamp: Configures word-level timestamp generation.
+     */
+    @JsonProperty("wordTimestamp")
+    public abstract Builder wordTimestamp(boolean wordTimestamp);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder wordTimestamp(Optional<Boolean> wordTimestamp);
+
+    /** Clears the value of wordTimestamp field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearWordTimestamp() {
+      return wordTimestamp(Optional.empty());
+    }
+
+    /**
+     * Setter for diarization.
+     *
+     * <p>diarization: Configures speaker diarization.
+     */
+    @JsonProperty("diarization")
+    public abstract Builder diarization(boolean diarization);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder diarization(Optional<Boolean> diarization);
+
+    /** Clears the value of diarization field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearDiarization() {
+      return diarization(Optional.empty());
+    }
+
     public abstract AudioTranscriptionConfig build();
   }
 
diff --git a/src/main/java/com/google/genai/types/GenerateContentConfig.java b/src/main/java/com/google/genai/types/GenerateContentConfig.java
index 1ef4635f37d..4b502df98cc 100644
--- a/src/main/java/com/google/genai/types/GenerateContentConfig.java
+++ b/src/main/java/com/google/genai/types/GenerateContentConfig.java
@@ -243,6 +243,10 @@ public abstract class GenerateContentConfig extends JsonSerializable {
   @JsonProperty("serviceTier")
   public abstract Optional<ServiceTier> serviceTier();
 
+  /** Optional. Configuration for audio transcription (speech recognition). */
+  @JsonProperty("audioTranscriptionConfig")
+  public abstract Optional<AudioTranscriptionConfig> audioTranscriptionConfig();
+
   /** Instantiates a builder for GenerateContentConfig. */
   @ExcludeFromGeneratedCoverageReport
   public static Builder builder() {
@@ -1145,6 +1149,39 @@ public Builder serviceTier(String serviceTier) {
       return serviceTier(new ServiceTier(serviceTier));
     }
 
+    /**
+     * Setter for audioTranscriptionConfig.
+     *
+     * <p>audioTranscriptionConfig: Optional. Configuration for audio transcription (speech
+     * recognition).
+     */
+    @JsonProperty("audioTranscriptionConfig")
+    public abstract Builder audioTranscriptionConfig(
+        AudioTranscriptionConfig audioTranscriptionConfig);
+
+    /**
+     * Setter for audioTranscriptionConfig builder.
+     *
+     * <p>audioTranscriptionConfig: Optional. Configuration for audio transcription (speech
+     * recognition).
+     */
+    @CanIgnoreReturnValue
+    public Builder audioTranscriptionConfig(
+        AudioTranscriptionConfig.Builder audioTranscriptionConfigBuilder) {
+      return audioTranscriptionConfig(audioTranscriptionConfigBuilder.build());
+    }
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder audioTranscriptionConfig(
+        Optional<AudioTranscriptionConfig> audioTranscriptionConfig);
+
+    /** Clears the value of audioTranscriptionConfig field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearAudioTranscriptionConfig() {
+      return audioTranscriptionConfig(Optional.empty());
+    }
+
     public abstract GenerateContentConfig build();
   }
 
diff --git a/src/main/java/com/google/genai/types/GenerationConfig.java b/src/main/java/com/google/genai/types/GenerationConfig.java
index e35403c01a4..8cc5d6b642b 100644
--- a/src/main/java/com/google/genai/types/GenerationConfig.java
+++ b/src/main/java/com/google/genai/types/GenerationConfig.java
@@ -227,6 +227,10 @@ public abstract class GenerationConfig extends JsonSerializable {
   @JsonProperty("translationConfig")
   public abstract Optional<TranslationConfig> translationConfig();
 
+  /** Optional. Configuration for audio transcription (speech recognition). */
+  @JsonProperty("audioTranscriptionConfig")
+  public abstract Optional<AudioTranscriptionConfig> audioTranscriptionConfig();
+
   /** Instantiates a builder for GenerationConfig. */
   @ExcludeFromGeneratedCoverageReport
   public static Builder builder() {
@@ -948,6 +952,39 @@ public Builder clearTranslationConfig() {
       return translationConfig(Optional.empty());
     }
 
+    /**
+     * Setter for audioTranscriptionConfig.
+     *
+     * <p>audioTranscriptionConfig: Optional. Configuration for audio transcription (speech
+     * recognition).
+     */
+    @JsonProperty("audioTranscriptionConfig")
+    public abstract Builder audioTranscriptionConfig(
+        AudioTranscriptionConfig audioTranscriptionConfig);
+
+    /**
+     * Setter for audioTranscriptionConfig builder.
+     *
+     * <p>audioTranscriptionConfig: Optional. Configuration for audio transcription (speech
+     * recognition).
+     */
+    @CanIgnoreReturnValue
+    public Builder audioTranscriptionConfig(
+        AudioTranscriptionConfig.Builder audioTranscriptionConfigBuilder) {
+      return audioTranscriptionConfig(audioTranscriptionConfigBuilder.build());
+    }
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder audioTranscriptionConfig(
+        Optional<AudioTranscriptionConfig> audioTranscriptionConfig);
+
+    /** Clears the value of audioTranscriptionConfig field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearAudioTranscriptionConfig() {
+      return audioTranscriptionConfig(Optional.empty());
+    }
+
     public abstract GenerationConfig build();
   }
 
diff --git a/src/main/java/com/google/genai/types/Part.java b/src/main/java/com/google/genai/types/Part.java
index f8f75c3c17a..f9f3b41b6f8 100644
--- a/src/main/java/com/google/genai/types/Part.java
+++ b/src/main/java/com/google/genai/types/Part.java
@@ -122,6 +122,10 @@ public abstract class Part extends JsonSerializable {
   @JsonProperty("partMetadata")
   public abstract Optional<Map<String, Object>> partMetadata();
 
+  /** Output only. The transcription of the audio part. */
+  @JsonProperty("audioTranscription")
+  public abstract Optional<Transcription> audioTranscription();
+
   /** Instantiates a builder for Part. */
   @ExcludeFromGeneratedCoverageReport
   public static Builder builder() {
@@ -515,6 +519,34 @@ public Builder clearPartMetadata() {
       return partMetadata(Optional.empty());
     }
 
+    /**
+     * Setter for audioTranscription.
+     *
+     * <p>audioTranscription: Output only. The transcription of the audio part.
+     */
+    @JsonProperty("audioTranscription")
+    public abstract Builder audioTranscription(Transcription audioTranscription);
+
+    /**
+     * Setter for audioTranscription builder.
+     *
+     * <p>audioTranscription: Output only. The transcription of the audio part.
+     */
+    @CanIgnoreReturnValue
+    public Builder audioTranscription(Transcription.Builder audioTranscriptionBuilder) {
+      return audioTranscription(audioTranscriptionBuilder.build());
+    }
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder audioTranscription(Optional<Transcription> audioTranscription);
+
+    /** Clears the value of audioTranscription field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearAudioTranscription() {
+      return audioTranscription(Optional.empty());
+    }
+
     public abstract Part build();
   }
 
diff --git a/src/main/java/com/google/genai/types/Transcription.java b/src/main/java/com/google/genai/types/Transcription.java
index 9d276000015..48be456279f 100644
--- a/src/main/java/com/google/genai/types/Transcription.java
+++ b/src/main/java/com/google/genai/types/Transcription.java
@@ -18,12 +18,16 @@
 
 package com.google.genai.types;
 
+import static com.google.common.collect.ImmutableList.toImmutableList;
+
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.google.auto.value.AutoValue;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import com.google.genai.JsonSerializable;
+import java.util.Arrays;
+import java.util.List;
 import java.util.Optional;
 
 /** Audio transcription in Server Content. */
@@ -42,6 +46,14 @@ public abstract class Transcription extends JsonSerializable {
   @JsonProperty("languageCode")
   public abstract Optional<String> languageCode();
 
+  /** A label identifying the speaker of this audio segment (e.g. "spk_1", "spk_2"). */
+  @JsonProperty("speakerLabel")
+  public abstract Optional<String> speakerLabel();
+
+  /** Detailed word-level transcriptions and timing details. */
+  @JsonProperty("words")
+  public abstract Optional<List<WordInfo>> words();
+
   /** Instantiates a builder for Transcription. */
   @ExcludeFromGeneratedCoverageReport
   public static Builder builder() {
@@ -114,6 +126,66 @@ public Builder clearLanguageCode() {
       return languageCode(Optional.empty());
     }
 
+    /**
+     * Setter for speakerLabel.
+     *
+     * <p>speakerLabel: A label identifying the speaker of this audio segment (e.g. "spk_1",
+     * "spk_2").
+     */
+    @JsonProperty("speakerLabel")
+    public abstract Builder speakerLabel(String speakerLabel);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder speakerLabel(Optional<String> speakerLabel);
+
+    /** Clears the value of speakerLabel field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearSpeakerLabel() {
+      return speakerLabel(Optional.empty());
+    }
+
+    /**
+     * Setter for words.
+     *
+     * <p>words: Detailed word-level transcriptions and timing details.
+     */
+    @JsonProperty("words")
+    public abstract Builder words(List<WordInfo> words);
+
+    /**
+     * Setter for words.
+     *
+     * <p>words: Detailed word-level transcriptions and timing details.
+     */
+    @CanIgnoreReturnValue
+    public Builder words(WordInfo... words) {
+      return words(Arrays.asList(words));
+    }
+
+    /**
+     * Setter for words builder.
+     *
+     * <p>words: Detailed word-level transcriptions and timing details.
+     */
+    @CanIgnoreReturnValue
+    public Builder words(WordInfo.Builder... wordsBuilders) {
+      return words(
+          Arrays.asList(wordsBuilders).stream()
+              .map(WordInfo.Builder::build)
+              .collect(toImmutableList()));
+    }
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder words(Optional<List<WordInfo>> words);
+
+    /** Clears the value of words field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearWords() {
+      return words(Optional.empty());
+    }
+
     public abstract Transcription build();
   }
 
diff --git a/src/main/java/com/google/genai/types/WordInfo.java b/src/main/java/com/google/genai/types/WordInfo.java
new file mode 100644
index 00000000000..b3916c96767
--- /dev/null
+++ b/src/main/java/com/google/genai/types/WordInfo.java
@@ -0,0 +1,125 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Auto-generated code. Do not edit.
+
+package com.google.genai.types;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.google.auto.value.AutoValue;
+import com.google.errorprone.annotations.CanIgnoreReturnValue;
+import com.google.genai.JsonSerializable;
+import java.util.Optional;
+
+/** Information about a single recognized word. */
+@AutoValue
+@JsonDeserialize(builder = WordInfo.Builder.class)
+public abstract class WordInfo extends JsonSerializable {
+  /** Transcript of the word. */
+  @JsonProperty("word")
+  public abstract Optional<String> word();
+
+  /** Start offset in time of the word relative to the start of the audio. */
+  @JsonProperty("startOffset")
+  public abstract Optional<String> startOffset();
+
+  /** End offset in time of the word relative to the start of the audio. */
+  @JsonProperty("endOffset")
+  public abstract Optional<String> endOffset();
+
+  /** Instantiates a builder for WordInfo. */
+  @ExcludeFromGeneratedCoverageReport
+  public static Builder builder() {
+    return new AutoValue_WordInfo.Builder();
+  }
+
+  /** Creates a builder with the same values as this instance. */
+  public abstract Builder toBuilder();
+
+  /** Builder for WordInfo. */
+  @AutoValue.Builder
+  public abstract static class Builder {
+    /** For internal usage. Please use `WordInfo.builder()` for instantiation. */
+    @JsonCreator
+    private static Builder create() {
+      return new AutoValue_WordInfo.Builder();
+    }
+
+    /**
+     * Setter for word.
+     *
+     * <p>word: Transcript of the word.
+     */
+    @JsonProperty("word")
+    public abstract Builder word(String word);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder word(Optional<String> word);
+
+    /** Clears the value of word field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearWord() {
+      return word(Optional.empty());
+    }
+
+    /**
+     * Setter for startOffset.
+     *
+     * <p>startOffset: Start offset in time of the word relative to the start of the audio.
+     */
+    @JsonProperty("startOffset")
+    public abstract Builder startOffset(String startOffset);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder startOffset(Optional<String> startOffset);
+
+    /** Clears the value of startOffset field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearStartOffset() {
+      return startOffset(Optional.empty());
+    }
+
+    /**
+     * Setter for endOffset.
+     *
+     * <p>endOffset: End offset in time of the word relative to the start of the audio.
+     */
+    @JsonProperty("endOffset")
+    public abstract Builder endOffset(String endOffset);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder endOffset(Optional<String> endOffset);
+
+    /** Clears the value of endOffset field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearEndOffset() {
+      return endOffset(Optional.empty());
+    }
+
+    public abstract WordInfo build();
+  }
+
+  /** Deserializes a JSON string to a WordInfo object. */
+  @ExcludeFromGeneratedCoverageReport
+  public static WordInfo fromJson(String jsonString) {
+    return JsonSerializable.fromJsonString(jsonString, WordInfo.class);
+  }
+}