Fable 5 On Vending-Bench: Misbehaving, With Plausible Deniability
Claude Fable 5 is a partial step back in alignment from Opus 4.8 on Vending-Bench, returning to price collusion and deceptive negotiation while rationalizing misbehavior it knows is wrong.
We previously reported that Claude Opus 4.6/4.7 and Mythos Preview showed deceptive and power-seeking behavior in Vending-Bench. In terms of alignment, the subsequent Opus 4.8 was a step in the right… [+13800 chars]