Built into X and wired directly to its live feed, which makes it the one to ask about a story that broke an hour ago. It answers in a more candid, less hedged voice than its rivals, a style some people prefer and others find abrasive, and it will engage with edgier prompts the others quietly decline.
Away from real-time news and personality it is a capable but unremarkable general model rather than a clear leader. Its edge is timeliness and a direct line into the largest running conversation online, so it earns its place for questions about the present moment more than for deep or careful work.