public Builder clearModelVersion() {
      modelVersion_ = getDefaultInstance().getModelVersion();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
Output only. The model version used to generate the response.
</pre>

<code>string model_version = 11 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerateContentResponse.java