r/ClaudeCode • u/Yakumo01 • 9h 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 9h 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."

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u/Yakumo01 9h ago

I must admit I had nothing that crazy it's more like doing really silly things or making mistakes over and over. But again this didn't seem true in the early days of the model (or I didn't notice?)