Tesla’s Full Self-Driving (FSD) beta lets you choose from three driving “profiles” that dictate how the car will react to certain situations on the road. Each mode, “Chill,” “Average,” and “Assertive,” varies in terms of aggressiveness (and potentially safety).
The feature was included in the October 2021 version 10.3 update, which was pulled two days after it started rolling out due to an issue with left turns at traffic lights. Tesla issued version 10.3.1 one day later, which still includes FSD profiles, as shown on the release notes posted on Not a Tesla App. Based on these notes, FSD profiles are described as a way “to control behaviors like rolling stops, speed-based lane changes, following distance and yellow light headway.”