@java.lang.Override
      public boolean hasModelName() {
        return ((bitField0_ & 0x00000001) != 0);
      }
<pre>
The model name to use. Only the public LLM models are accepted. e.g.
'gemini-1.5-pro-001'.
</pre>

<code>optional string model_name = 1;</code>

@return Whether the modelName field is set.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerationConfig.java