What company invented the first muscle car?

There's no single definitive answer to who invented the "first" muscle car because the genre evolved gradually. However, Pontiac is frequently cited as a strong contender, with the 1964 Pontiac GTO generally considered a seminal model in the muscle car's development. It's important to note that other manufacturers were producing similar high-performance vehicles around the same time, but the GTO is often credited with popularizing and defining the muscle car formula.