For vision work on Opus 5, give the model cropping tools instead of more thinking — and delete your old vision workarounds

Claude Platform Docs·medium signal

Anthropic states that Opus 5's vision performance "is strongest when the model has tools to iteratively analyze, crop, and visually verify its work, and tool use is a more cost-effective lever than thinking alone." It also tells developers to re-validate any prompt-side vision workarounds tuned for prior models, since they "may no longer be needed." The practical build: for chart/document/diagram extraction or UI replication, wire a crop-and-re-read tool into the loop rather than raising effort — and audit the accumulated prompt hacks in your image pipeline, which are now likely pure overhead.