Hi Zhong, you are absolutely right - ChatGPT appears to return subtly different answers depending on if it's the first question in a new chat, or if you alter the wording slightly (eg. use the verbose expression Cache ObjectScript instead of COS).  For example, I also can't reproduce the exact same answers for your questions.

Sometimes, it will also refuse to provide a code example, simply returning the dreaded phrase "As an AI language model, I cannot provide specific code ......".