public int getPromptTokens() {
        return this.promptTokens;
    }
Get the promptTokens property: The number of tokens in the provided prompts for the completions request.

@return the promptTokens value.
chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/model/FastChatCompletionsUsage.java