# Claude Fable 5.1 and Claude Mythos 5.1

# Claude Fable 5.1 与 Claude Mythos 5.1

600 points · 567 comments | 作者: denysvitali | 原文: news.ycombinator.com

时间: 2026-09-01T17:53:53Z

### 热门评论

1. [GodelNumbering]

> The price reduction comes from the cache read pricing falling from $1/M to $0.25/M, which means that Fable 5.1 now costs half of Opus's cache read costs ($0.5/M).This gives a lot of credit to the theory that Anthropic did not get much bite on Fable at its original pricing, which in turn likely places a ceiling on LLM pricing in general.Interestingly also, if you take away terminal-Bench-Science 0.1 results, it is hard to see ANY improvement:Terminal-Bench 4.0: Fable 5.1 is +3.5% vs Opus 5.GDPval-AA v2: +1.5% vs Opus 5.OSWorld 2.0: +2.5% vs Opus 5.Humanity's Last Exam (with tools): +1.6%Keep in mind that this is supposed to be an entirely higher tier of a model than Opus 5. For one tier up and one version up, these are not really improvements. Probably leaves no room to place Opus 5.1 anywhere. Combined with the fact that they are selling 'readability'... Has frontier progress finally stalled?

⋯ 继续阅读请开通会员 ⋯