Elevated errors on Claude Opus 5

ccroemer about 3 hours ago 30 commentsRead Article on status.claude.com

DE version is available. Content is displayed in original English for accuracy.

⚡ Community Insights

Discussion Sentiment

56% Positive

Analyzed from 863 words in the discussion.

Discussion (30 Comments)Read Original on HackerNews

jcims•about 1 hour ago

Operationally (and anecdotally obv) we've found that accessing Claude via AWS Bedrock has been notably more stable than direct to Anthropic.

htrp•42 minutes ago

We actually tracked this over the last year, bedrock is significantly better than the anthropic direct endpoints

jph•about 1 hour ago

Lots of errors. Opus 5 is also giving me many more hallucinations, including things that aren't even in the right territory. It's also telling me that it's making many mistakes, and the language feels off-kilter as if it's not using typical clear phrases.

solfox•1 minute ago

Quality of output of both Fable and Opus seems to have gone down quite a bit over the past week. Many mistakes.

RGS1811•about 1 hour ago

It is aggressively proactive in ways that make it very hard to use. I had to turn down the effort level to “low” to stop it from going off in random directions every couple of turns.

Aldipower•about 2 hours ago

I would say "Elected errors _in_ Claude Opus 5" wouldn't be incorrect either.. Opus 5 isn't very reliable for coding and introduces a lot of regressions every single time I use it. Do you have the same experiences?

flaburgan•about 1 hour ago

I also found it to forget some obvious cases in a quite simple flow (validate the email address of a user who register), that surprised me a lot. Maybe it's because I got used to Fable? But I am quite sure Opus 4.8 wouldn't have make this mistake. If I had time I would try the same prompt with it to see. Anyway, back on 100% Fable for me.

egeozcan•about 2 hours ago

I don't know what I could be doing differently to you but I found Opus 5 to be more reliable than even myself at times. Maybe your stack is unusual or you have conflicting commands in your prompts vs CLAUDE.md (that really confuses it)? It could be anything but this huge error bar in delivered quality is one of the biggest issues with LLMs.

jarym•about 1 hour ago

Getting to grips with each new model does require some tweaking and experimentation. So far I've found Opus 5 to repeatedly pause its work and give me some seemingly randomly invented decisions to make.

jdthedisciple•42 minutes ago

> give me some seemingly randomly invented decisions to make

Any examples?

Saline9515•about 1 hour ago

Same here, also it lies often to me or implements something else that what was planned. It feels quite strange to see it say casually "I didn't tell you the full truth on X" when I notice the issues. At the same time, maybe it is more honest?

benjiro29•about 2 hours ago

Opus 5 isn't very reliable for coding and introduces a lot of regressions every single time I use it.

And GPT 5.6 Sol over engineers just about everything. No LLM is perfect, its about learning the issues with each LLM and figuring out if you can live with it. Knowledge means that you can anticipate if it tries to pull something funny, and harness it against that behavior.

Aldipower•about 2 hours ago

Sure, but I am a long time Opus user 4.5,4.6,4.7,4.8 and I wonder what's wrong with 5?

pimeys•about 1 hour ago

I remember when 4.7 and 4.8 were released and people were asking what's wrong with them and 4.6 is the best.

But yes, I also think it's not the greatest model for programming. On the other hand, for agentic tasks that are not programming related it's hard to beat Opus 4.8. It can try different things and pivot even when the user is not great with prompting. 5.0 seems to not be worse, but definitely wastes more tokens and costs more.

cyanydeez•about 2 hours ago

this would be _Great_ advice if you owned your own LLM and your knowledge was trapped in Amber because you were satisfied.

It's horrible advice given what we've seen consistent: changing alignments, changing guardrails, changing system prompts, changing inference priorities, etc.

Anyone who relies on these for their work product is chaining themselves to a matrix multiple of indetermintism.

bearjaws•about 2 hours ago

I do not experience any regressions, I don't really notice much difference either.

trentor•about 2 hours ago

Maybe it's my harness but I haven't seen it introducing regressions.

cbg0•about 2 hours ago

Do you not have unit tests, or how does it introduce regressions? You can tell it how to run the test suite in CLAUDE.md

quaheezle•about 2 hours ago

Opus 5 tries to modify the unit tests as a cover to its own regressions - thinking its own logic is correct and the test must be wrongly specified

jvuygbbkuurx•about 1 hour ago

I found it eagerly reversing existing product decisions like changing a user given date into created date, since it thought creating something that is in the past is incorrect. This was not even related to the task at hand at all. I noticed this kind of stuff happens more with ultracode for some reason.

simiones•about 2 hours ago

It is a well known fact that projects with unit tests never have regressions.

cbg0•about 1 hour ago

I don't understand the need for the snarky comment, LLMs can run the test suite and avoid regressions.

Aldipower•about 2 hours ago

I detect the regression already in planning with Opus 5, so I do not let Opus 5 implement anything. But it is a waste of time and tokens! Does planning with Opus 5 works out for you?

cbg0•about 1 hour ago

It sounds like you just need to correct the plan it lays out to avoid the regression? I'm just looking to debug with you, not defending the model. I've mostly used Opus 5 for code reviews & bugfixes.

ectoloph•about 1 hour ago

These bursts of downtime are one of the reasons I end up with multiple smaller subscriptions between providers.

I'd just end up being really annoyed about the downtime if it lands in the middle of a working day.

oefrha•about 1 hour ago

Not sure if it’s just me but in Codex, GPT-5.6-Sol and IIRC older 5.5 models can stop dead in the track a couple times a day saying “model is at capacity” (paraphrasing). Then I wait a minute or two and ask it to continue and it’ll more often than not happily use the same model. These frequent mini “outages” are pretty annoying especially if one isn’t supervising. Claude has had long outages but I haven’t run into this kind of mini outages on a daily basis recently.

ikidd•12 minutes ago

Hermes seems to pick up after a stoppage. At least I've never had to push it again, it might just take a long time to finish a task and then I'll see the messages in the transcript.

nijave•40 minutes ago

I wish the harnesses would auto resume but I suppose that would also add more load without more money for subscription customers...

whalesalad•24 minutes ago

in the codex case, it will keep going it is not a blocking prompt.

someguyiguess•43 minutes ago

That happens to me constantly with codex

croemer•about 3 hours ago

Error message: API Error: 529 Overloaded. This is a server-side issue

Invictus0•about 1 hour ago

stop posting these on hn

darkwater•about 1 hour ago

There are tens of HN front page posts about GitHub outages. Why not Anthropic's?

nijave•39 minutes ago

Anthropic has an outage nearly everyday. GitHub seems like they're down to about once a month again