OpenAI
OpenAI Codex CLI#6
OpenAI's official open-source terminal agent featuring secure sandbox execution and GPT-5 reasoning models.
OpenAI Codex CLI brings OpenAI's frontier models straight to the local terminal. Operating inside a sandboxed execution layer with adjustable approval thresholds, it modifies source files, executes test suites, and offloads heavy background builds to OpenAI cloud VMs. It is included natively for ChatGPT Plus and Pro subscribers.
出力・コード品質
9/10
自律性とタスク計画
8.2/10
信頼性と安全性
8.6/10
実行速度
8.3/10
Evaluation dimensions
✓ 主な強みとメリット
- Native first-party integration with GPT-5, o3-mini, and GPT-4.5 reasoning models
- Robust sandboxing with fine-grained permission prompts for filesystem and shell commands
- Cloud handoff capabilities for running long-duration test runs asynchronously
- Bundled directly with standard ChatGPT Plus ($20/mo) memberships
- Open-source client architecture
✕ 課題と制限事項
- Requires OpenAI account authentication or paid API credentials
- Less extensive custom tool and MCP plugin ecosystem than Claude Code
- Offline capabilities are restricted