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Claude Opus 5.5

749 pointsby km144today at 4:29 PM604 commentsview on HN

Comments

firemelttoday at 5:43 PM

wow its really smarter than opus?

cmrdporcupinetoday at 5:53 PM

GPT Sol 6 has also released today, but no official blog announcement yet

https://www.reddit.com/r/codex/comments/1wnggya/gpt_6_droppe...

bdangubictoday at 5:47 PM

I am pacing my apple pie consumption … :)

karp773today at 5:23 PM

I get this in my claude.ai usage:

Resets Get extra wiggle room to explore Opus 5.5. Expires Oct 22.

What the hell does this mean? There are weekly "resets" anyways. And there will be 4 of them before Oct 22.

kingstnaptoday at 4:44 PM

> It’s good at finding and fixing inefficiencies in software

Holy shit! Its happening!

Now if we can the AI to understand this *implicitly* so that it doesn't need to be stated upfront, we might be able to undo years of "premature optimization is the root of all evil".

ramesh31today at 5:28 PM

It seems context length has completely fallen out of the discussion since we hit 1M, is that just going to be what it is now?

nailertoday at 5:27 PM

> Opus 5.5 communicates more naturally than prior models. Early testers found its writing clearer and easier to follow, which addresses some of the common feedback we heard about Opus 5.

Thanks God. Opus 5 was a massive regression compared to Opus 4.8. People were spending tokens on fixing Opus-isms rather than actually doing work.

LoganDarktoday at 5:07 PM

> In the coming weeks we will also be expanding access to our Cyber Verification Program, and verified cybersecurity practitioners will be able to use Opus 5.5 for their work.

I was accepted into the CVP a little while ago. Does this mean I'll need to apply again?

anentropictoday at 5:09 PM

ooh exaggerated film grain

Arcurutoday at 4:53 PM

Great. Now let me use the subscription outside Claude Code.

simianwordstoday at 4:48 PM

How do I get access to that reset? I can’t find it in my app.

ricardobeattoday at 4:49 PM

Great that they listened! The improvement in communication style looks fantastic. Opus 5 was insufferable and I was on the verge of cancelling my subscription.

jdw64today at 4:45 PM

Finally, it seems like a good time to do some 'load-bearing' work on my project for a while

viccistoday at 4:36 PM

So it beats Fable 5.1, by quite a bit, on every metric? Interesting.

Might have to use my $20 Claude sub some more. I was moving away from it to a $100 OpenAI one to avoid the Claudese and poor token efficiency of Opus 5, given that I couldn't use Fable 5.1 with my tier, but this is worth trying out.

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phendrenad2today at 4:47 PM

> Because Opus 5.5 is comparable to Claude Mythos 5.1 in biology and cybersecurity, we’re deploying it with safeguards similar to those on Claude Fable 5.1

Great so good luck using this for any low-level embedded or operating system development (unless you really, really like Opus 4.8 and want to be greeted by its familiar face after a few minutes of work!)

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blurbleblurbletoday at 5:17 PM

It'd better be good, I'm so tired of the shenanigans

theGeatZhopatoday at 5:24 PM

is OPUS 5.5 still not reading CLAUDE.md, failing to follow told tasks, inventing and hallucionating, just refusing to read files ("read the whole file" -> read 2-lines -> infere its wrong -> destroy the codebase), needing constant babysitting just because its so UTTERLY DUMB! i cant imagine going back to OPUS 5 - i'll rather jump out of the window as to use it EVER AGAIN!!

mupuff1234today at 4:33 PM

What happened to "slowing down"?

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Madmallardtoday at 6:24 PM

> cyber security and life sciences verification programs

chinese models can't come soon enough

we're already getting enshittification

Helldeztoday at 7:44 PM

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vividfriertoday at 5:55 PM

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giancarlostorotoday at 4:52 PM

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nicolamanzinitoday at 6:59 PM

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xenit_v0today at 4:49 PM

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ace2pacetoday at 5:08 PM

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mrbonnertoday at 5:56 PM

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SadErntoday at 4:33 PM

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hirako2000today at 4:44 PM

Throwaway accounts posting after a few minutes some anthropic or another ai lab.

Infomercial at its best.

No wonder we are hammered with ai announcements.

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gopalvtoday at 4:35 PM

The whole thing reminds me of the Apple feature flag story[1] from a generation ago.

[1] - https://news.ycombinator.com/item?id=6372466