As of my knowledge cutoff in September 2021, the base Model 3 Standard Range Plus had a usable energy capacity of around 54 kWh, while the Long Range and Performance models had larger battery packs with usable energy capacities of around 75 kWh or more.1
This paper was flagged by Guillaume Cabanac on PubPeer.
References
1Masakure A, Gill A, Singh M. The Impact of Battery Charging and Discharging Current Limits on EV Battery Degradation and Safety. In: 2023 3rd Asian Conference on Innovation in Technology (ASIANCON). IEEE; :1-5. doi:10.1109/ASIANCON58793.2023.10270635