How-ToDevelopersOctober 2, 2026

Hugging Face releases guide to multi-harness RL for coding agents

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The same open-weight model with identical weights scores 62% in one agent harness and 33% in another, per Hugging Face's post-training team. The open-source method trains any model with RL inside unmodified harnesses like Claude Code, Codex, OpenCode and Pi, using TRL and the Harbor framework.

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