Is Boston the most expensive city in the US?

I'm curious, could you clarify if Boston truly holds the title of the most expensive city in the United States? Given the varying costs of housing, transportation, and daily expenses across the country, I'm eager to know if Boston's prices outstrip those of other major metropolitan areas like New York, San Francisco, or Los Angeles. Is there a particular metric or index that's commonly used to determine such rankings, and how does Boston fare in comparison? I'm genuinely interested in understanding the financial landscape of Boston in the context of its national peers.