public ChatRequestBuilder frequencyPenalty(Double frequencyPenalty) {
		request.setFrequencyPenalty(frequencyPenalty);
		return this;
	}
Number between -2.0 and 2.0. Positive values penalize new tokens based on their
existing frequency in the text so far, decreasing the model's likelihood to repeat
the same line verbatim.
@param frequencyPenalty frequency penalty, default is 0
@return builder
src/main/java/org/mvnsearch/chatgpt/model/completion/chat/ChatRequestBuilder.java