Every AI is different.
Some are fast in some races, some are slow, some times one AI is fast in one session and slow in another.
Sometimes, the AI is just down right stupid as stupid can be.
This is Wilk on the 24h Spa.
At the end of lap 8 it just starts to rain, he has medium slicks on, But this can be forgiven as the AI have thresholds for changing tires as they do not react to incoming rain like you can.
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End of Lap 9 track is 50% wet, he does not pit for inters or wets but stays out on slicks.
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End of Lap 13 still on the same slicks, but their is a dry line now, but he has less than 1 lap of fuel, does not pit
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He continues to drive with no fuel worn slicks even when the weather changes again
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But I hate them all equally as they're annoying as hell in any race.