According to God of Prompt on Twitter, lowering the model temperature parameter from 0.7 to 0.3 when evaluating with TruthfulQA significantly increases the 'truthful' answer score by 17%, not by improving actual accuracy, but by making models respond more cautiously and hedge with phrases like 'I don't know' (source: twitter.com/godofprompt/status/2011366460321657230). This exposes a key limitation in the TruthfulQA benchmark, as it primarily measures the conservativeness of AI responses rather than genuine accuracy, impacting how AI performance and business trustworthiness are assessed in real-world applications.