Harness or Model? Isolating the Harness Effect in Agentic Coding with a Contamination-Controlled Private Suite

arXiv:2609.11987 · cs.AI, cs.CL, cs.SE · Submitted 2026-09-08 · Read on arXiv

cs.AI, cs.CL, cs.SE

Submitted: 2026-09-08

Updated: 2026-09-08

Comments: 25 pages, 5 figures. Revised 8 September 2026 (telemetry correction). Code and derived data in the replication package

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Agentic Coding — 2× in this paper · explained in 1 episode

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