Claude Opus 5.5

throwaway2027

After yesterday outage is the new Opus 5.5 load-bearing?

variety8675

I hope this actually fixes the terrible writing style of Opus 5

m4tthumphrey

Just post the bloody content. This UI/scrolling thing is horrific.

dbbk

This makes Fable not really make any sense?

Catloafdev

> 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. Sounds like they noticed the complaints. I'm curious to see what LLM-isms this one may have.

Gander5739

Dupe: https://news.ycombinator.com/item?id=49803863 (or vice versa)

mupuff1234

What happened to "slowing down"?

Lord_Zero

The test they performed to port HAProxy from C to Rust is crazy.

Gander5739

Dupe: https://news.ycombinator.com/item?id=49803892

alpineman

So we skipped 5.1, 5.2, 5.3, and 5.4: we really are plateauing

skunkworker

At this point I'm convinced they are skipping numbers so soon they will be at or ahead of OpenAI's numbering scheme. Is the Xbox 360 (Xbox 2) vs PS3 debacle all over again.

meerita

As long as it's not as verbose as Opus 5, I am quite happy with a better version that's also less expensive. I will test it tonight. Grok 4.7 was horrible, and for mundane tasks I am relying on DeepSeek Flash 4.1 with great success using OpenCode.

gopalv

The whole thing reminds me of the Apple feature flag story[1] from a generation ago. [1] - https://news.ycombinator.com/item?id=6372466

nickandbro

Wow! Though need to see its token efficiency to better assess. Been hearing rumors it generates much more output tokens per task.

cogythea

Interestingly they've changed their approach to usage resets for this release - with previous releases I've had my usage instantly reset, but now in the Claude app I've got a 'Reset for free' button that expires Oct 22, which seems to effectively be a whole new usage window I can activate whenever's convenient

buntp

Masterpiece by openai to call their model '6', this model feels already behind

glub

System card: https://www-cdn.anthropic.com/fc1b44717c85dc068bc6ba50242199...

calibas

> We see signs that Opus 5.5 often suspects it is being evaluated, which challenges our ability to assess how it will act in the vast variety of real-world settings it is deployed in. We can't test it properly because it knows it's being tested.

pookieinc

“It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.” They write that at the top, but then on benchmarks, it beats literally every other model, including Fable and Astra?

viccis

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.