They didn't accidentally pick up anything. Grok is extremely consistent in both referring to OpenAI in refusals, and also using the full repertoire of GPT-ism

They didn't accidentally pick up anything. Grok is extremely consistent in both referring to OpenAI in refusals, and also using the full repertoire of GPT-ism in its other responses, such as ending every message with an "Overall, ..." or "In conclusion, ..." section. They RLHF-ed Grok on GPT output, specifically and in volume. Maybe sourced via the API or other means, I don't know. But Igor's explanation that "this is very rare" makes no sense after you play with Grok for even 5 minutes.