People keep on mentioning gpt2, but it's worth recalling that back in 2019 it was basically the first model that was capable of zero-shot generation of coherent multi-paragraph text. Having it write security exploits like Mythos wasn't even on the radar. Rather, the concerns were about misuse and societal implications, which in retrospect were pretty prescient: https://openai.com/index/gpt-2-6-month-follow-up/