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

**Published:** September 14, 2026
**Author:** Mohsen Arjmandi
**Source:** arXiv — cs.AI
**Language:** en-US
**HTML:** https://aiqazaqstan.com/en/articles/harness-or-model-isolating-the-harness-effect-in-agentic-coding-with-a-c

arXiv:2609.11987v1 Announce Type: new Abstract: An agentic coding system couples a language model to a harness: the tools, prompts and control flow that turn a chat model into an autonomous software engineer. Vendors ship harnesses tuned to their own models, and practitioners…

> From the original source: **arXiv — cs.AI**
> [Read full article at arXiv — cs.AI](https://arxiv.org/abs/2609.11987)

**Tags:** #Google DeepMind #OpenAI #Anthropic #arXiv #DeepSeek

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