This post has been merged into No Error Doesn’t Mean Success: Silent Failures, Opus Fabricating Tool Output, and the Hook That Finally Stops It. All of the original content lives there now, and that’s the only copy that gets updated.
Supposedly the Smartest Model, and Opus 5 Spent My Whole Day Spinning in Place
Wrong languages, sudden Simplified Chinese, then whole turns with no visible output — and a session log that matched an issue open since June 15.
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