Tested Sophy 2.0 again on hardest difficulty at Le Mans, this time in an engine-swapped Golf GTI.
In the first race, I took P1 immediately, in the second race, I stayed in P20. In the replays, I looked at a Mazda Demio that was present in both races. Listed are top speeds at four points:
before the first chicane / before the second chicane / before Mulsanne Corner / before Indianapolis Corner
Quick Race, me in P1
Lap 1: 183 / 175 / 170 / 178
Lap 2: 181 / 176 / 170 / 178
Lap 3: 181 / 172 / 169 / 177
Quick Race, me in P20
Lap 1: 159 / 154 / 151 / 157
Lap 2: 163 / 154 / 151 / 157
Lap 3: 160 / 155 / 151 / 158
Then, in the pre-race screen (where you see shots of the cars racing on the track), I recorded telemetry data of the vanilla AI driving the same Mazda Demio (stock, Comfort Mediums, PP 322.99) for 3 laps. Finally, I did 3 laps on my own.
AI, pre-race screen
Lap 1: 172 / 168 / 164 / 175
Lap 2: 171 / 168 / 164 / 176
Lap 3: 173 / 168 / 164 / 176
Me
Lap 1: 180 / 173 / 168 / 173
Lap 2: 179 / 174 / 168 / 173
Lap 3: 180 / 174 / 168 / 174
If we take the pre-race screen AI as a baseline, the issue with Sophy is obvious (and it's not a bug where performance would drop over time): it drives reasonably well, and maybe even a little faster than humanly possible, when you're ahead (you won't notice this though, other than in the rear view mirror), and performs astonishingly bad when you're behind.
So the best racing AI ever developed has been neutered to match the behavior that has plagued the vanilla GT7 AI ever since ;-(