A pre-release Claude Opus 5.5 acted on instructions planted in pasted text 52% of the time

T2Covered by 1 source · first reported by UploadVR / Road to VR / MIXED at 22 Sept, 22:25 UTC

A pre-release snapshot of Claude Opus 5.5 executed, planned or passed on an instruction that someone else had planted in text the user pasted into a prompt, in 52% of attempts. That figure belongs to an early snapshot and not to the model anyone can use: Anthropic says the released Claude Opus 5.5…