Mitchell Hashimoto 的实测揭示了 Fable 模型的真实表现：它并非全能，但在特定优化任务上能带来数量级提升。做高性能计算或深度优化的开发者，可以看看他如何用 Fable 将微秒级操作压到纳秒级，以及是否值得为此付出时间和成本。
Mitchell Hashimoto 对 Fable 模型进行了详细评测。他认为 Fable 在广泛的代码架构设计任务中表现平平，性价比不高。但在高度定向、目标明确的循环任务中，Fable 表现卓越，例如将 SwiftUI 布局解析器的性能从微秒级优化到纳秒级，尽管耗时 2 小时、花费 40 美元。相比之下，在常规的迭代开发任务中，GPT-5.5 和 GLM-5.1 在几分钟内就能完成，且成本更低。Hashimoto 建议将 Fable 保留用于定向、精细的分析工作，而非日常使用。
源：https://t.co/0IdlUHaYHA
源： x.com/mitchellh/stat… Mitchell Hashimoto @mitchellh Fable is a good model. As with all new models, it is simultaneously excellent and entirely unremarkable (relative to other models). It is slow and expensive, and the "loops are all you need" discourse they are pushing is obvious in the context of someone using Fable-class models What I've found so far is that for broad scope design (code architecture) tasks, Fable is unremarkable. Or, not better enough to justify its cost and speed. But in highly targeted goal-oriented loops, it is another beast entirely. It is very slow but produces very good results. I let it churn on optimizing a SwiftUI-layout resolver in Go I wrote and it was able to bring it down to an order of magnitude I could not reach myself (micro => nanosecond scale). But it took 2 hours and $40 to do it and I had to claw back some changes it overfit to Apple Silicon. Still, very worth it. In comparison, for "implement this feature/change" iterative work, I ran head-to-head Fable vs GPT5.5 vs. GLM-5.1. They all produced equally acceptable final results, but GPT5/GLM did it in a couple minutes and Fable was churning away for 40 minutes. And GLM cost me less than a dollar, GPT5.5 ~$1.50, and Fable cost $9. You can see that in this context, interactively working with an agent is nonsense. Its too slow. You need to write loops to keep the agent working and you probably want to highly parallelize the work being done. As with all things, I think a balance makes sense... My sense is that I'd reserve Fable for targeted, surgical analysis and work. Not for daily driving everyday tasks. I'm going to keep spending a shitload of money (relatively) and maining Fable for the rest of the week to continue to judge, will report if anything changes. I'll continue to head-to-head as well. 🔗 View Quoted Tweet 💬 0 🔄 0 ❤️ 0 👀 442 ⚡