Introducing our Browser Agent Evals.
We benchmark frontier and open models using various harnesses on computer-use tasks.
Our evals are fully open source and reproducible via our Evals CLI.
Fable 5.2 scores 92% on HardBench, our curated benchmark of difficult computer-use tasks.
It beats the previous champion, Opus 5.5, in accuracy, but costs 2.5x more and is 13.76% slower on average.
Introducing Claude Fable 5.2 and Claude Mythos 5.2, designed to tackle the most daunting technical challenges.
They’re capable collaborators on ambitious projects in many fields, and show improvements in areas like coding, reasoning, and vision.
The @LangChain team evaluated 7 different Browser Tools to power Managed Deep Agents.
It's no surprise that Stagehand was simultaneously the fastest, cheapest, and most accurate. Read the full report to learn how.
