Harness Hub
All people

Writer

clem

Posts about agent harnesses on X

Open harnessesClaude Code

Posts on X about Open harnesses, Harness engineering, Claude Code.

X

On X

Shown as plain text; “Load on X” loads X's script for that post, which may set cookies.

  • Oct 5, 2026

    We turned Claude Code, Codex, Hermes, Pi, @opencode and other coding harnesses into RL environments. No changes to the harnesses, no changes to the training code. Any open model, any task set, fully open source my friends!

    Same model, same weights: 62% under Mini-SWE-Agent, 33%… pic.twitter.com/OpL1kmQjzl

    Open on X

More on the X feed

Sources

  1. x.com/ClementDelangue
  2. Sample post

Verified Oct 29, 2026