head to head
Grand Prix 4 asks more than Grand Theft Auto V, and the gap is execution.

Execution · Practiced Mastery
A serious F1 simulation testing precise car control and setup optimization.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Grand Prix 4 leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Grand Prix 4 leans clearly harder on execution.
Grand Prix 4
Precise braking, throttle and racing-line control define lap times
Grand Theft Auto V
Driving and shooting demand decent inputs.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Prix 4
AI drivers follow scripted lines, not adapting to you
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Prix 4
Weather and grip add some unpredictability per race
Grand Theft Auto V
Some mission and lobby randomness.
Grand Prix 4 leans clearly harder on optimization.
Grand Prix 4
Setup tuning and optimal lines are a deep solvable layer
Grand Theft Auto V
Heists, money loops, builds learnable.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.