Browser Use 1.0.4 stops screenshot pruning from breaking prompt caches
Browser Use released 1.0.4 with batched screenshot pruning after 20 screenshot-bearing tool results. The maintainer says the earlier per-step rewrite invalidated provider prompt caches; its 200-task BU Bench run held score roughly flat while reported model cost per task fell from $0.434 to $0.208.
Why it matters: Browser agents can silently multiply input-token cost when their own history compaction rewrites cached prefixes. The release identifies a concrete runtime cause and makes history mutation, cache hits and per-task spend observable deployment checks.