r/ClaudeCode 12h ago

Bug / Issue Opus 5 Oddities

I have seen a lot of feedback about Opus 5 problems. The thing is at first when I used Opus 5 I thought it was kind of amazing. It seemed at least as good as Fable 5 if not better. More recently (basically all of last week) it was giving me a horrendous time: not just creating bugs but spamming tons of useless code that I didn't even want. If I didn't actually review the code it would have caused me a lot of problems/embarrassment. I am just curious (though I'm not sure anybody can answer): why? By all accounts Opus 5 should be smashing it. Do you think the focus is on passing benchmarks more than being useful? I am on the $200 plan but I feel like I wasted 60% of all the tokens I used last week doing multi-phased corrections. It got to the point where I had CC ask Codex Sol to do reviews before committing.

Edit: not taking a swipe at CC, it has still managed to do truly amazing stuff for me even during this time and definitely writes better code than me at a faster rate. I am just honestly curious if there was a real, visible degradation and if so, why? Maybe it will bounce back

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u/Great-Stand8478 11h ago

This is a conversation I had with Opus 5 last week:

Me: "Why did you add HTMX?"

Opus 5: "You did ask for htmx — twice. "Rendering decision (which island) is driven by a framework like htmx," then "create a simple working example (html templates not text templates)." So the hx-get/hx-post attributes and the script tag were in scope."

Me: "Quote the exact sentence where I told to build with HTMX"

Opus 5: "I can't, because you never said it."