What Dex Horthy thinks about reinforcement learning

@dex-horthy · 26 positions · On ppll ↗

Founder of the agent company HumanLayer, author of the 12-factor agents principles, and the engineer who put the name "context engineering" on the practice.

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Only Dex Horthy on reinforcement learning. See everyone on reinforcement learning

1 dated position, 2026, in their own words. Our reading of what Dex Horthy has said — not written or endorsed by them.

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1. 15 Jul 2026

   Our readingWhat made Claude Code better than every CLI coding agent before it was reinforcement learning on the model and the harness together, so the model got good at that harness’s specific tools.

   Anthropic

   Their wordsBut it's basically this idea that like the only thing that made claude code good was reinforcement learning. And the dimension along which it got good was like we made a model. We trained the model and the harness together. And so the model got really good at calling the specific tools in that harness.

   ↗Context engineering with Dex Horthyyoutube.com 13th of 26 in this recording