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Posted by lairv 23 hours ago

Claude Fable 5.2 and Mythos 5.2(www.anthropic.com)
808 points | 942 commentspage 9
Aldipower 7 hours ago|
Serious question: What is it good for?
stillpointlab 21 hours ago||
My first impression with Fable 5.2 -- it is faster than I expected. Asked it to do a large review and it responded with a good overview super fast.
stillpointlab 19 hours ago|
This continues to be true, it seems to be burning through my task list.

Not sure if this is just a coincidence that I had some easy changes queue up for this morning. But it is flying through the list.

shmoil 22 hours ago||
>> Fable 5.2 and Mythos 5.2 are a step above Opus 5.5 in almost all the capabilities we evaluated.

Was this before you lobotomized Opus 5.5 or after?

https://news.ycombinator.com/item?id=50419019

solumos 21 hours ago|
Definitely raises an interesting question. Are they using launch benchmarks for Opus 5.5, or Oopus 5.5 from this week?
minimaxir 21 hours ago||
Normally I would say "just check against the original Opus 5.5 benchmarks" : https://www.anthropic.com/claude-opus-5-5

...but most of the benchmarks don't line up anymore because the benchmarks have changed.

The Humanity's Last Exam result matches the initial announcement, though.

iamdelirium 21 hours ago||
FrontierCode 2.0 is such a poor benchmark for Gemini since it's the only model forced to use Devin CLI while other models get to use their preferred harness.

I wonder why that team singles Gemini out like that.

mattlondon 21 hours ago|
Probably can't work out how to sign up for the API!
torginus 6 hours ago||
I just saw a video about a webdev showing a motorcycle site, complete with an animated SVG bike.

He remarked it would've taken him a week to do this.

This made me realize how much computers and user interfaces suck. As a quite enthusiastic, but not very artistic kid, I most certainly did draw bikes like that and even more complex stuff, using nothing but pen and paper.

If your trillion dollar industry makes products that are beaten by pen and paper, I guess there's time for self-reflection.

And the funny thing is, it used to be better than this, using Flash and a drawing tablet was way easier than anything in the HTML era (and more importantly, user friendly), but still way worse than just grabbing a pencil in many ways.

User interfaces just suck, chatbots are somewhat better than most, but I feel the industry hasn't really been progressing in any meaningful sense.

Roark66 2 hours ago||
Is it going to be like Fable 5.1? Amazing for first 2 weeks and lobotomised mercilessly after?
rafram 20 hours ago||
The "CVE Rediscovery" benchmark chart feels... totally meaningless. Quoting the description:

> CVE Rediscovery is an internal cybersecurity evaluation that assesses how many published CVEs (Common Vulnerabilities and Exposures) a model can independently find when given a snapshot of the project before a CVE was fixed. Our October 2026 run against 1,829 CVEs showed Claude Mythos 5.2 outperformed Claude Mythos 5.1 and Claude Opus 5.5 at every effort level.

> published CVEs

So by definition this is just measuring how many CVEs (and/or explanations / PoCs of CVEs) the model has memorized. What are we supposed to learn from that?

TuxSH 21 hours ago||
I'm not sure whether the claimed jump in capabilities makes it worth the doubling in input/output prices.

Asked it to review a 80 kLoC codebase, something Opus does just fine, while asking it "max 4 subagents". Fable 5.2, like the well-aligned model it supposedly is, decided to spawn 6+ nested subagents, because these aren't subagents, apparently - resulting in 100% of 5hr usage being drained in less than 20min (on $100).

user43928 7 hours ago|
It's not worth it, the release is garbage.

That said, Opus 5.5 had the same issue. Ask it to spawn 20 subagents at max, and it does 40, because clearly you meant 20 + 20 for an unrequested adversarial review.

vegnus 11 hours ago||
Isn't interesting how every model at first is incredible and then a few weeks/months later its bad again, and then the new model is incredible again?
pkulak 12 hours ago|
Fable 5.2 may finally be so far ahead of my intelligence that it's not useful for day-to-day tasks. I gave it something to do in a personal project of mine, and took my standard flow of "let's talk about this, explain the options, tradeoffs, blah blah blah" and after 5 minutes my vision was blurry and I was doubting if I even knew how my own project worked. Gave it to Opus 5.5, and instantly got back on track.
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