Gemini is similar. It insists that information from before its knowledge cutoff is still accurate unless explicitly told to search for the latest information before responding. Occasionally it disagrees with me on the current date and makes sarcastic remarks about time travel.

One nice thing about Grok is that it attempts to make its knowledge cutoff an invisible implementation detail to the user. Outdated facts do sometimes slip through, but it at least proactively seeks out current information before assuming user error.