Machine Learning Algorithms & Natural Language Processing

Aug 30, 2026 · Artificial Intelligence

Lego‑RL Enables Stable, Reliable RL Training for Coding Agents Without SDK Modifications

Lego‑RL is an open‑source reinforcement‑learning framework that trains coding agents directly on unmodified OpenHands SDK, Claude Code, and OpenCode harnesses, boosting SWE‑bench Verified scores from 64/62/57 to 70.4/68.2/66.6 while addressing faithful optimization, reliable execution, and observable training through GSPO and a sandboxed architecture.