# Arena 评测 7 个模型在 Claude Code、Codex 和 Pi 下的编码表现：harness 选择对成功率影响小但显著影响成本

- 来源：Arena.ai (@arena)
- 发布时间：2026-09-17 01:49
- AIHOT 分数：63
- AIHOT 链接：https://aihot.news/items/cmu4ed2980kcaro4wot25nixq
- 原文链接：https://x.com/arena/status/2100280949661667413

## AI 摘要

Arena 实习生 @melissapan 评测 7 个模型在 Claude Code、Codex 和 Pi 三种 harness 下的编码表现，共 21 个模型-harness 组合。

## 正文

Do models need their native harness for coding?
Awesome work from our intern @melissapan on this. She dug into whether the harness (Claude Code vs Codex CLI vs Pi) actually moves the needle for coding agents.

Turns out it matters way less than people assume. 21 model-harness pairs, real rigor. More from Arena to come.

More details on the Arena blog: https://arena.ai/blog/coding-agents-harness-tax

### 引用推文

> Melissa Pan：Does your Claude model really need Claude Code…? 🤔 We evaluate 7 models on Claude Code, Codex, and Pi. Three surprising findings emerge: 1️⃣Harness choice has ...