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Posted by lairv 23 hours ago

Claude Fable 5.2 and Mythos 5.2(www.anthropic.com)
822 points | 952 commentspage 13
jameson 21 hours ago|
why would xhigh -> max increase the cost but lowers the score on frontier 2.0 bench?
jcims 20 hours ago|
Just a hunch but I think there's a signal to noise ratio issue that starts to pollute things when the reasoning content starts to massively outsize the original ask.
yash-kapoor 20 hours ago||
Seriously waiting for this one! Will try it asap.
7e 15 hours ago||
Anthropic thinks that their models are smart, but not so smart so as to be able to fake responses to their alignment tests. How would they know again?
bergheim 15 hours ago||
I can't believe he wasn't at top. Always is. Nothing to add but hey: I guess pelicans will be at the end of this.

God damn I'm tired of the fucking pelicans.

arunvpp 19 hours ago||
opus will be launch after astra 2
rfgplk 22 hours ago||
Every single time I click on these announcements the frontier model ALWAYS scores around ~60-80%. Every. Single. Time. Like, I just went back to the Opus 4.6 + 5 announcements, they were also scoring 60-80%.

https://www.anthropic.com/news/claude-opus-4-6 https://www.anthropic.com/news/claude-opus-5 https://openai.com/index/introducing-gpt-5-3-codex/

For every single announcement, not only do the top models always score 60-80%, the older models somehow start scoring 20-30% (even though previously they were scoring 60%). It's completely unclear whether the methodology changes, how these scores are even evaluated or which domains are being tested. What's worse is that the "benchmarks" keep being updated with no explanation or due process.

wrs 21 hours ago||
The benchmarks have a lot of churn because the models keep saturating them. But the Anthropic announcements you linked, and the current one, have the benchmark versions listed right there in the table.
Bolwin 20 hours ago|||
There is plenty of explanation, if you actually go seek out the benchmark. Past 80 benchmarks start approaching saturation and are not very useful to show differences
mr_coffee 21 hours ago||
A real shell game. They keep changing benchmarks
dboon 20 hours ago||
It's shocking to me that when I check threads for new frontier model releases on HN, it's full of people complaining. I, for one, am happy to see the frontier being advanced. These tools are life changing, and I'm extremely thankful for them.
user43928 7 hours ago|
The problem here is that this doesn't advance much of anything and isn't even worth using over Opus 5.5.

My expectations were much higher for the improvement to their larger model. It clearly did not scale well, the improvement is marginal.

BoorishBears 22 hours ago|
Using this in CC and immediately getting a cartoonish number of compactions.

The disdain frontier labs have for their users really sucks.

user43928 7 hours ago|
It needs the latest Claude Code update otherwise context is set to 200k and compacts before even responding.
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