Is it just me, or has Opus suddenly turned dumb as rocks with 0 attention span over the last half day or so? Noticeably worse output across multiple agents on very different projects.
Comments
jrockwaylast Thursday at 10:07 PM
There was an article on HN a month or so about benchmarking Opus 5.5 every day and recording / publishing the results. I recall this being a github repo, but my searches turned this up instead: https://www.bridgebench.ai/nerf-bench/claude-opus-5-5
So it seems like ... it is not getting dumber. I find myself using Fable a lot more, though. Opus 5.5 was never as fun as Fable, but it's pretty good.
itopaloglu83last Thursday at 11:35 PM
I think something has changed, maybe about two weeks ago, because there’s this fixation from the model where if you ever need to make a correction, it simply becomes disinterested with your instructions.
74948494i4last Thursday at 9:59 PM
New model incoming
flynfishlast Friday at 7:32 PM
I found your post because I searched "Did Opus 5.5 get worse today?". I experienced the same thing with it not following instructions well and just missing things.
nikolaylast Thursday at 9:48 PM
Agreed. Yet, it munches tokens like there's not tomorrow. I don't get anything done with Claude in the past 2-3 weeks - just eating up its weekly quota within a day.
cromkalast Saturday at 1:41 AM
I have same experience with Fable, it's absolutely ridiculous. It's not one, it's like 10 transgressions an hour, doing really stupid stuff, hallucinating, ignoring commands, gold-fish memory.
They're nerfing them real hard.
constipnyesterday at 12:59 PM
I am still using Opus 5.5 over fable 5.1, no decline noticable
jpbryanlast Thursday at 9:52 PM
I started noticing at the end of last week. My colleagues started noticing on different days this week.
Benderlast Friday at 12:58 AM
Is it just me, or has Opus suddenly turned dumb as rocks
What I've seen is that if I let Opus 5.5 run for too many turns (not sure how to quantify that) it starts exhibiting signs of human dementia. It will forget it told me to run something and will then accuse me of misconfiguring something that it literally gave me a script to run that configures something. It also forgets the instructions in my project and has to go back and read them and apologizes for forgetting the instructions. Between this increasing context rot and the excessive shock collars applied to defensive security coding it's rare that I can even use Opus 5.5. For the past few weeks I have had to use Opus 4.8 and even that now has a sub-set of the shock collars applied [cyber] which forces me to start a new session. This has led me to researching the Abliterated 70B/120B (uncensored) models and required hardware.
So dumb as rocks? I am not seeing that, but the context rot is getting worse for me personally. I don't know if it makes a difference, I am on the pro 20x plan. Maybe people on enterprise plans do not see this which I assume is most of the people here using Claude.
jaapzlast Thursday at 9:59 PM
Fable 5.5 incoming?
godotlast Saturday at 5:54 AM
Sometimes I read a thread like this and I feel like I don't know what people are doing or am I the only crazy one in the world. I'm still using Composer 2.5 (a low tier model released 5 months ago and about a Sonnet 4.x tier capability one) and being extremely productive with it and working on multiple projects on a $20/mo Cursor sub. I move to Grok 4.7 in some cases if I find Composer 2.5 not smart enough for something, or for company work when I'm not the one paying for tokens, but it's honestly not even needed most of the time. Composer 2.5 writes all kinds of code (JS, Rust, etc.) just fine and tests and compiles them and everything, and is super fast. What are people doing that constantly need Opus 5.5 and even having to move to Fable/Mythos?
vldsznlast Thursday at 9:59 PM
nerfed, fable 5.5 coming soon
1_1xdev1last Friday at 6:35 AM
some of my coworkers said it got stupid verbose yesterday or the day before, all of a sudden. i haven't noticed any difference personally.
you, and they, might be getting a/b tested
Theophane_Ramelast Friday at 3:03 PM
Fable 5.5 incoming?
fractoriallast Friday at 12:37 AM
First time?
anitroveslast Friday at 10:41 AM
I am feeling the same got dumbest answers so I just changed the model