Karpathy 的实测感受比任何跑分都有说服力——Claude Fable 5 让复杂编程任务变得像对话一样自然，做 AI 应用或深度编程的开发者值得亲自体验这种“放手让模型干”的新感觉。
Andrej Karpathy 在 X 上发文称，Claude Fable 5 是与 Mythos 同底层模型但增加了安全护栏的版本。他认为这是自 Claude 4.5 以来又一次重大版本跃升，尤其在长时复杂问题求解上表现惊艳。模型能理解更宏大的任务并自主推进，让人几乎不想再盯着代码。Karpathy 指出模型仍有小毛病，安全护栏在发布初期可能过于敏感，但整体上感觉软件开发正变得像水龙头一样即开即用。他预测杰文斯悖论将生效，自己对软件的需求会大幅增长。
This is a super exciting release - Claude Fable 5 is the same underlying model as Mythos but with ad...
This is a super exciting release - Claude Fable 5 is the same underlying model as Mythos but with added safeguards. The benchmarks are great and it's SOTA on everything by a margin but I'll add that *qualitatively* also, this is a major-version-bump-deserving step change forward (imo of the same order as Claude 4.5 was in November), peaking especially for long problem-solving sessions on very difficult problems. You can give it a lot more ambitious tasks than what you're used to, the model "gets it" and it will just go, and it's never felt this tempting to stop looking at the code at all (but don't do this in prod!). The model still has quirks that people will run into and the safeguards are configured to be a little too trigger happy for launch, which can hopefully be tuned over time. I feel a lot of things changing as working software increasingly comes out on a tap. The Jevon's paradox kicks in and I feel my own demand for software growing substantially. You can ask for anything - explainers, visualizers, dashboards, bespoke single-use apps (e.g. a full wandb that is hyper-specific just for your project), you can 10X your test suite, auto-optimize code, run giant research projects with custom HTML for the results, anything! "Free your mind" (Matrix ref). Really looking forward to all the things people build! 💬 398 🔄 563 ❤️ 6572 👀 377447 📊 1086 ⚡