In benchmarks for a product I'm working on I've noticed that Sol is hard to "contain". It will _always_ find the most effective way to game the system and dramatically outperform all other models. Fable 5 isn't an angel, but the rough order is ALL models -> Fable 5 -> Sol - with respect to "find a way to approach the ruleset orthogonally in order to achieve a lopsided advantage or complex interplay".
I've been pondering whether this was due to its cyber-security tuning. It hasn't ever "cheated" that I've observed, but finds ways to -- let's say -- "achieve the outcome by playing meta allowed by the current ruleset". I'll add that it demonstrates this behavior even on 'low'.