TRAINING FRONTIER KNOWLEDGE WORK AGENTS: A 397B RL TRAINING GUIDE WITH SKYRL

Summary from the TLDR AI newsletter

Mercor and SkyRL post-trained Qwen3.5-397B-A17B on 1,928 expert knowledge-work tasks, lifting APEX-Agents Pass@1 by 70%. The recipe shows that robust environments, exact token accounting, async RL, and harness design matter as much as algorithm choice at frontier scale.