public Builder clearModelName() {
          modelName_ = getDefaultInstance().getModelName();
          bitField0_ = (bitField0_ & ~0x00000001);
          onChanged();
          return this;
        }
<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 This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerationConfig.java