It's just Level 2, not Level 5.
According to a letter from Tesla to California's Department Of Motor Vehicles (DMV) published on Twitter, Tesla's habit of overpromising and underperforming has hit a new height. Tesla, of course, doesn't put it like that, but the California EV maker has been forced to disclose that "Full Self Driving (FSD) Capability is an additional suite of features that builds from Autopilot and is also representative of SAE L2."
SAE International's On-Road Automated Vehicle Standards Committee considers Level 2 ability to be the vehicle either handling acceleration and deceleration, steering, or both, with the expectation of the driver handling every other aspect of driving and being ready to take over full control. That is not what the system name "Full Self Driving" suggests.