Short answer — follow the M3 chips, and you'll find the newest MacBooks. Slightly longer answer, the M3 MacBook Airs are the most recent model, with a release in March 2024. The M3 MacBook Pros were released in October 2023. It looks like M4 MacBook Pros might be on the horizon for later this year, but so far, the iPad Pro is the only Apple machine with an M4 chip.