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Re:Claude Fable 5.2 and Mythos 5.2 by breakwaterlabs on Monday November 09, 2026 @02:46PM (#50430829)
- Why are they stacking Fable xHigh against Carbon Med?

- How did they produce such a bizarre effort-intel curve for Carbon that goes against every available benchmark?

- Why did they leave Carbon-- positioned primarily as a cyber model-- off of the single cyber benchmark comparison?

- Why do they switch to comparing against Argon (rather than carbon) for robodojo?

Re:Claude Fable 5.2 and Mythos 5.2 by marshalla on Monday November 09, 2026 @02:53PM (#50430953)
yes. this.
Re:Claude Fable 5.2 and Mythos 5.2 by breakwaterlabs on Monday November 09, 2026 @02:58PM (#50431045)
Just to follow-up-- artificial Analysis shows no justification for that Carbon effort curve, but it does show Carbon on medium smashing Fable on things like Terminal-Bench and AA-Omniscience v1.1 Non-Hallucination Rate.

But I suppose the reality is rather obvious when you note the funny games they're playing with the graphs, and the things they won't talk about (where's Astra on that CVE chart?)

Re:Claude Fable 5.2 and Mythos 5.2 by polski-g on Monday November 09, 2026 @03:13PM (#50431279)
Because Carbon is not out, nobody can run tests on it.
Re:Claude Fable 5.2 and Mythos 5.2 by scrollop on Monday November 09, 2026 @03:23PM (#50431452)
Arena.ai released carbon tests 12 days ago - the only service that I have seen on yt that gained access. And you can compare to other SOTA models in their video.

https://www.youtube.com/watch?v=NO2I3ueVQrk

And they have one on fable 5.2 that was just released, yay

https://www.youtube.com/watch?v=QwaU4yU0PdQ

Re:Claude Fable 5.2 and Mythos 5.2 by jsnell on Monday November 09, 2026 @03:16PM (#50431328)
> - Why are they stacking Fable xHigh against Carbon Med?

Because on that specific benchmark (FrontierCode 2.0), Medium is Carbon's best effort level and xhigh is Fable 5.2's best effort level. You can see that on the graph your next point is about.

And it's just that one benchmark that's at medium. "All scores show each model’s highest-available effort unless otherwise noted".

> - How did they produce such a bizarre effort-intel curve for Carbon that goes against every available benchmark?

The graph is labeled as being about FrontierCode 2.0. Those appear to be Carbon's scores on the official FrontierCode 2.0 leaderboard: https://cognition.com/blog/frontier-code-2.0

> - Why did they leave Carbon-- positioned primarily as a cyber model-- off of the single cyber benchmark comparison?

> - Why do they switch to comparing against Argon (rather than carbon) for robodojo?

Because no numbers are available for Carbon for those benchmarks, and the model isn't publicly available so they couldn't run the benchmarks themselves?

Re:Claude Fable 5.2 and Mythos 5.2 by breakwaterlabs on Monday November 09, 2026 @03:41PM (#50431769)
> Because on that specific benchmark (FrontierCode 2.0), Medium is Carbon's best effort level

I am referring to the chart that cross-compares multiple benchmarks, which Artificial Analysis clearly shows Carbon-high as superior on. Further, AA's FrontierCode chart places Carbon-high as having a higher score on Frontier 2.0 than Carbon-med.

Where it gets very interesting is when you look at the Cognition "FrontierCode" publish date (2026.10.27), and the revision as of 10.28 in web archive (https://web.archive.org/web/20261028175237/https://cognition...). This revision has a VERY different Carbon effort / intelligence curve where high beats medium.

It is only with the latest revision, as of today, that all of a sudden Carbon's benchmark curve goes cone-shaped. Curious, indeed....

Re:Claude Fable 5.2 and Mythos 5.2 by phoghed on Monday November 09, 2026 @03:44PM (#50431815)
> Do you expect that OpenAI would grant such access in this case?I

Do you expect that nobody at Anthropic has such access? Trillion dollar company can’t manage this basic level of opposition research?