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Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by ricardobeat on Monday November 09, 2026 @04:05AM (#50423006)
I noticed the same and posted about it three days ago!

Opus is suddenly fumbling basic tool calls and failing to finish tasks even at high, where I had been permanently using it on low effort with success since it came out. It is very frustrating.

My guess is they quantized it and/or reallocated DC capacity to train a new model, this has happened before.

Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by amelius on Monday November 09, 2026 @04:58AM (#50423444)
> It is very frustrating.

Not just frustrating, it can also be dangerous. What if you trust Claude with certain security-sensitive things (because experience), and suddenly you cannot trust it anymore like that?

Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by Phemist on Monday November 09, 2026 @05:12AM (#50423573)
It literally could have been rolled out in the middle of that brain surgery experiment on a mouse. Woops.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by trvz on Monday November 09, 2026 @06:07AM (#50423982)
Anyone who chooses a cloud model instead of local for medical use has a damaged brain.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by skywal_l on Monday November 09, 2026 @05:12AM (#50423577)
It seems to me the answer is in your question.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by 4ggr0 on Monday November 09, 2026 @05:21AM (#50423650)
> What if you trust Claude with certain security-sensitive things

then $corp should remove your access to these security-sensitive things ;)

Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by pakitan on Monday November 09, 2026 @06:10AM (#50424009)
Maybe don't trust something with non-deterministic output for critical level security?
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by ACCount39 on Monday November 09, 2026 @06:26AM (#50424128)
Instructions unclear; revoked all human access.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by wholinator2 on Monday November 09, 2026 @06:54AM (#50424361)
Right lol, i didn't know we'd built a machine that was capable of getting critical level security deterministically correct. That's not me, at least...
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by polishmijajca on Monday November 09, 2026 @07:30AM (#50424706)
*chaotic

It is deterministic, if we're being pedantic

Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by cyberclimb on Monday November 09, 2026 @07:50AM (#50424893)
It really though?? Even if you set temperature to 0 I saw research showing that the scheduling of the order of operations in the GPU firmware itself can change trailing decimals places and affect the output token
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by xeshuman on Monday November 09, 2026 @09:15AM (#50425961)
I'm aware operations can technically finish at different rates throughout all of a GPU's cores, but I am not exactly sure that GPU firmware would change the outcome of a calculation (unless there's something specifically in the firmware for it)
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by cyberclimb on Monday November 09, 2026 @09:37AM (#50426247)
I don't know a lot about it tbh so I probably mislabeled it as a firmware issue
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by pakitan on Monday November 09, 2026 @11:14AM (#50427558)
If we're being pedantic, it may be deterministic from the point of view of Anthropic. They can guarantee that my prompt X results in actual prompt X+Y (Y being all the settings they control), which would hopefully result in deterministic output Z. From my point of view, Y may as well be random, resulting in non-deterministic output Z for my input X.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by thereader12 on Monday November 09, 2026 @11:19AM (#50427644)
Everything might be deterministic if we are being super-pedantic.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by iterance on Monday November 09, 2026 @11:24AM (#50427727)
It is not deterministic.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by criddell on Monday November 09, 2026 @06:37AM (#50424204)
[delayed]
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by mring33621 on Monday November 09, 2026 @03:09PM (#50431216)
And knowing is half the battle!
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by Azantys on Monday November 09, 2026 @07:10AM (#50424508)
You shouldnt do that in the first place
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by pythonaut_16 on Monday November 09, 2026 @05:08PM (#50432961)
This argument would be much more convincing if Anthropic wasn't constantly trying to sell everyone on the fact that you should.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by losvedir on Monday November 09, 2026 @09:39AM (#50426276)
Then you should have evals.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by infamouscow on Monday November 09, 2026 @01:38PM (#50429627)
If you've outsourced your thinking to a cloud model, the cloud model is going to take your job soon enough. You won't need to worry about this for much longer :)
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by crnkofe on Monday November 09, 2026 @06:19AM (#50424076)
I noticed its been trying to drag out the conversation on every topic. Maxxing token consumption for the dollars instead of staying on point. Makes sense for them but its frustrating for me as a user. I suspect this is going to be the AI version of enshittification. Now its only missing some badly needed in-stream ads.
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by bita_nidir on Monday November 09, 2026 @07:21AM (#50424610)
Multiple instances of failing a Bash tool, calling bash (lowercase) and getting rejected and even reprimanded by the API "No such tool, call Bash instead".

Killing it's own shell, multiple, multiple times in the same session. I'm sure I saw a phrase "I did it again".

It's so shit that it must be damage control. The alternative is to limit usage and that'd affect the IPO even more.

Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by ricardobeat on Monday November 09, 2026 @04:32PM (#50432509)