Anthropic better replace Opus 4.8 with a newer model. I just tried to give it a task that was a simple implementation of new features based on already existing ones - almost too easy for Fable. Opus 4.8 (Ultracode) not only stopped for my unnecessary confirmation mid-task (even though there was my explicit order not to stop) but also made several mistakes (due to skipping instructions). When I manually checked the results, Opus tried to make its work easier by not implementing newer code but by copy-pasting the existing one, which is a bit hilarious. At this point, it’s not a reliable model for me and will stop using Opus 4.8 completely. The only reason for keeping my Max 20x is Fable. submitted by /u/DrHumorous
Originally posted by u/DrHumorous on r/ClaudeCode
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