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Posted by km144 1 day ago

Claude Opus 5.5(www.anthropic.com)
999 points | 732 commentspage 7
madjam002 1 day ago|
I noticed a big speedup in Opus 5 on Max x20 since about 10 days ago, and I feel like the model has been performing better.

It would be great to know if this was Opus 5.5 or a lesser incremental improvement, as otherwise it's difficult to judge whether Opus 5.5 is expected to be a big improvement.

It's frustrating that there isn't more transparency here.

somewhatjustin 1 day ago||
> Claude Sonnet 5.5 and Claude Haiku 5.5 will follow in the coming weeks, with many of the same improvements to performance, efficiency, and safety.

Nice. I was starting to think Haiku was going to be abandoned.

glub 1 day ago||
> For users with cybersecurity use cases that may be blocked by our cyber safeguards, we recommend accessing our models with reduced cyber blocking classifiers via our Cyber Verification Program. Claude Opus 5.5 will be available through this program in the near future.

Anthropic has used "in the near future" for Mythos-class models too, but CVP is still Opus 5 only.

Why even have the program designed for trusted access to cyber capabilities if you're not providing access to cyber capable models via the program?

blfr 1 day ago||
It's awesome that the apt packages for claude and claude-code are out right now. I can test-drive Opus 5.5 right away. Very cool, Anthropic.
jacobgold 1 day ago||
I use the other 50% of my $200/mo Claude subscription by having Fable run Opus subagents for a lot of work. That way I don't have to deal with Opus directly.
toephu2 1 day ago||
When using max effort, I run into context compaction quite a lot. I haven't seen any increase in context window size at all over the past half year (stuck at 1M).

Are the frontier labs even working on this problem?

mnicky 1 day ago|
Why would you use max? It's usually unnecessary and even prone to overthinking. In my experience, since Opus 5 the medium/high is usually enough (until 4.8 I used xhigh, but never max). Even low is quite usable these days..
toephu2 1 day ago||
actually I meant to say xhigh.

even at xhigh I get context compaction quite a bit.

aurareturn 1 day ago||
I found myself going back to Fable over and over again. At this point, I’m not sure if I’m just used to its style or it is truly more capable.

I tried Opus 5 and Astra.

variety8675 1 day ago||
I hope this actually fixes the terrible writing style of Opus 5
emadabdulrahim 1 day ago||
It’s not a 100% fix, but with concise output style on, it’s much better.
akhilome 1 day ago||
I found having a reminder at every turn through the UserPromptSubmit [1] hook helped with taming the word salad from 5.

Hopefully the output from vanilla 5.5 is as good as they claim. I’ll try out later tonight.

[1] https://kizi.to/claude-talks-too-much/

gavinray 1 day ago||
[dead]
yipinwong 1 day ago|
I spent about $5 per sentence in my resume using Fable 5.1 (High) to verify accuracy, inconsistency, and edit.

Opus 5.5 (med, as it's better than F5.1 high per graph in the article) used $2.2 and caught errors that Fable 5.1 missed.

Try Opus 5.5, cheaper, faster, and more intelligent for those prepping for interviews.

copperx 1 day ago|
$5 per sentence?
yipinwong 1 day ago||
I am sorry, I meant to say I generated STAR out of my resume line, trying to generate STAR, and polish it thus $5.

---

I provided crapton of context for that one resume line. All the work I did, documentations for my justifications, etc.

I initially messed up and came out ot $5, rest of resume used around $4 per line (I used a fresh new session on purpose).

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As a clarification, $2.2 average for OPUS 5.5 was the same process in a new session, same context, same prompts.

Also adding verification for that Fable 5.1 output in the same sesssion.

toasty228 1 day ago||
No wonder compute is tight when people burn millions of tokens to polish every single lines of their resume, all that work just for your resume to be injested by another claude clanker once you submit it, what a fucking time to be alive...
yipinwong 21 hours ago||
mind your own business
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