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Claude Opus 5.5 is the model a lot of builders are testing when the task is hard and the repo is messy. Longer agent loops, sharper tool use, and fewer brittle stalls on real coding work.
I made a video on what Opus 5.5 actually does differently and where it still trips. https://youtu.be/xbBH97uvIp0
If you are choosing a top coding model this week, put Opus 5.5 on the same failing suite as your current default before you switch.
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