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Re:Livenerf: Has Opus 5.5 been nerfed yet? by prodigycorp on Tuesday September 29, 2026 @07:53PM (#49902486)
Incorrect.

Anthropic has admitted to nerfing in the past. There have also been inference bugs. On top of that, model performance changes as they move compute to schwaggier providers as well.

Your chart is wrong.

Re:Livenerf: Has Opus 5.5 been nerfed yet? by johnfn on Tuesday September 29, 2026 @07:58PM (#49902518)
Sorry, you are correct - I modified my original post. I get frustrated every time there's a model release and 1 week later everyone is saying NERF! NERF! 99.9% of the time these people are wrong, but you are right that it's technically not 100% due to a few edge cases.

I am more skeptical about the compute provider claim - do you have any evidence of that?

Re:Livenerf: Has Opus 5.5 been nerfed yet? by r_lee on Tuesday September 29, 2026 @08:30PM (#49902820)
I noticed that a few weeks back 5.6 sol would regularly glitch out and start speeding random words or loop and then the next day it'd be fine

and there's sometimes just huge floods of complaints from people all of a sudden, which is pretty unlikely to be a coincidence

Re:Livenerf: Has Opus 5.5 been nerfed yet? by rhdunn on Wednesday September 30, 2026 @03:01AM (#49905396)
I've seen that looping and glitching behaviour in over-quantized (~Q4 or lower) local models like Llama and Qwen 3.x. Thus, it is likely that they quantize the model after release to save on compute costs (while giving a favourable result at launch). That quantization can result in changes to the model's behaviour (you are changing the weights) that could be interpreted as nerfing.
Re:Livenerf: Has Opus 5.5 been nerfed yet? by simonw on Tuesday September 29, 2026 @07:55PM (#49902503)
> Anthropic has admitted to nerfing in the past

Where?

Re:Livenerf: Has Opus 5.5 been nerfed yet? by prodigycorp on Tuesday September 29, 2026 @07:59PM (#49902533)
Man this was last year and some Claude subreddit drama that I can’t furnish offf the top of my head but maybe one of the historians remember it.
[dead]
Re:Livenerf: Has Opus 5.5 been nerfed yet? by what on Tuesday September 29, 2026 @09:57PM (#49903453)
> bugs

There are no bugs, just happy little accidents.

Re:Livenerf: Has Opus 5.5 been nerfed yet? by consumer451 on Tuesday September 29, 2026 @10:01PM (#49903480)
u/bcherny does sound a bit like Bob Ross now that you mention it.
Re:Livenerf: Has Opus 5.5 been nerfed yet? by Spooky23 on Tuesday September 29, 2026 @11:15PM (#49903961)
> "We never reduce model quality due to demand, time of day, or server load."

That just means they don’t reduce model quality for those reasons.

They didn’t mention other reason, for example, “Make more money”.

Re:Livenerf: Has Opus 5.5 been nerfed yet? by p-e-w on Tuesday September 29, 2026 @08:25PM (#49902771)
Noone can seem to remember anything with certainty when asked to actually substantiate these claims.
Re:Livenerf: Has Opus 5.5 been nerfed yet? by computerex on Tuesday September 29, 2026 @08:54PM (#49903024)
Re:Livenerf: Has Opus 5.5 been nerfed yet? by erinnh on Tuesday September 29, 2026 @08:38PM (#49902887)
I mean there is a direct link two comments down from here from 30 minutes before your comment: https://news.ycombinator.com/item?id=49902477
Re:Livenerf: Has Opus 5.5 been nerfed yet? by p-e-w on Tuesday September 29, 2026 @09:52PM (#49903424)
That’s NOT Anthropic admitting to “nerfing” their model as claimed above (which implies intent), that’s a regression which they quickly fixed.

Christ this forum has become intellectually dishonest.

Re:Livenerf: Has Opus 5.5 been nerfed yet? by jibalt on Wednesday September 30, 2026 @03:57AM (#49905816)
There has always been plenty of intellectual dishonesty here, but remember Hanlon's Razor.
Re:Livenerf: Has Opus 5.5 been nerfed yet? by jibalt on Wednesday September 30, 2026 @03:57AM (#49905820)
Er, perhaps take a look after the edit:

> There are recorded cases of real regressions, but they're better characterised as incidents, not nerfs

Re:Livenerf: Has Opus 5.5 been nerfed yet? by erinnh on Wednesday September 30, 2026 @06:53AM (#49907097)
I dont really characterize a nerf as always by intent.

So I found this incident, as they called it, to still be relevant and why benchmarks such as the OP are useful.

Re:Livenerf: Has Opus 5.5 been nerfed yet? by prodigycorp on Tuesday September 29, 2026 @08:42PM (#49902918)
I’m typing from my phone and im not going to review the semantics of Anthropic’s storied history of performance issues.

It’s not just ant. There are so many small knobs that providers can claim isn’t nerfing but “load management” or “improving user experience”. One example from OpenAI is reducing juice to reduce time to first token.

Re:Livenerf: Has Opus 5.5 been nerfed yet? by winwang on Tuesday September 29, 2026 @09:44PM (#49903369)
You can just have your agent find the evidence, review it, copypaste it.
Re:Livenerf: Has Opus 5.5 been nerfed yet? by QwenGlazer9000 on Tuesday September 29, 2026 @08:49PM (#49902976)
Earlier in march/aprile, there was a regression in Claude code.

Unintentional tbf.

Re:Livenerf: Has Opus 5.5 been nerfed yet? by weird-eye-issue on Wednesday September 30, 2026 @01:24AM (#49904700)
Unrelated to the models
Re:Livenerf: Has Opus 5.5 been nerfed yet? by ffsm8 on Wednesday September 30, 2026 @02:21AM (#49905131)
does it really matter wherever its the harness or the model for the vibe coder user claude code?

fwiw, i think almost all regressions are down to a/b testing in the harness by anthropic, but it is objectively indistinguishable beyond "the coding agent ceases to be usable" and i'm back to traditional coding for a few hours until its back to normal again

Re:Livenerf: Has Opus 5.5 been nerfed yet? by weird-eye-issue on Wednesday September 30, 2026 @04:26AM (#49905992)
...

It absolutely matters because something like Claude Code has no guarantee that there won't be changes between updates but a model pinned at the API version level that is getting enterprise traffic absolutely does have that guarantee and would be a much more widespread problem...

Re:Livenerf: Has Opus 5.5 been nerfed yet? by thephyber on Wednesday September 30, 2026 @04:49AM (#49906160)
Yes. The agent allows you to switch models, so you could sidestep a bug in one model by temporarily using other models.

The /r/antigravity SubReddit is full of users who very much notice bugs with the tool/agent. We should be thankful that Claude Code is pretty stable by comparison.

Re:Livenerf: Has Opus 5.5 been nerfed yet? by weedfroglozenge on Wednesday September 30, 2026 @02:19AM (#49905107)
Honestly you need to start making pelicans on day of release, and following up a month later. Only way we are going to catch them
Re:Livenerf: Has Opus 5.5 been nerfed yet? by Rapzid on Wednesday September 30, 2026 @08:40AM (#49908065)
This is the way. Pelicans in a coal mine.
Re:Livenerf: Has Opus 5.5 been nerfed yet? by swader999 on Tuesday September 29, 2026 @07:56PM (#49902509)
Right, and it would be simple to un-nerf or shadow nerf by any kind of angle they want.
Re:Livenerf: Has Opus 5.5 been nerfed yet? by vikramkr on Wednesday September 30, 2026 @02:24PM (#49912510)
Unintentional bugs aren't nerfing. Nerfing is deliberate Enshittification done secretively.