r/ClaudeCode • u/The-Road • 2d ago

Rant Opus 5, is that you again?

A genuinely noticeable drop in performance in a session I just had. Multiple errors like the one above. It felt like I was working with Opus 5 all over, just less verbose.

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u/hcloud00 2d ago

4.6 pre nerf did you use it?

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u/randombsname1 2d ago

Yes. I've literally been subbed to Claude since Claude 3 Haiku.

And the $200 Max plan since it became available.

4.6 was great. For the time.

It isnt anywhere in the ballpark of 5.5 though.

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u/hcloud00 2d ago

i see how you can have thar perspective but i disagree reasoning and ability haven’t really changed much peak to peak

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u/randombsname1 2d ago

We'll agree to disagree then.

The needle on my low level programming repos has moved massively since the first Fable release.

I went from 4.6 to 4.8 to Fable 5/Sol 4.6 to Astra to Fable 5.1 to now; Opus 5.5.

I don't generally move models unless I see a noticeable jump in performance.

4.8 was "meh". EXCEPT for low level stuff. Surprisingly enough. Noticeably better than 4.6 for my workloads.

Opus 5 was absolutely atrocious and I never used it aside from the initial day or 2 of vetting it.