Evolutionary Comparison of Technical Architectures
The 2023 version of Codex CLI realizes three major breakthroughs compared to the old version:
- Model Upgrade
- Adoption of new generation models such as o4-mini and support for 16k contexts
- Code Completion Accuracy Improvement of 37% (Official Benchmark)
- security system
- Introducing the Apple Seatbelt Sandbox (macOS)
- Linux containers using namespaces isolation technology
- Engineering improvements
- Full-featured Git integration (diff comparison/autocommit)
- Support to project level
codex.mdConfiguration inheritance - Built-in Markdown parsing engine
These improvements have allowed the tool to evolve from a mere code generator to a complete development assistance platform, and its open source agreement (MIT License) has dramatically lowered the barrier to enterprise adoption.
This answer comes from the articleOpenAI Codex CLI: Terminal Command Line AI Coding Assistant Released by OpenAIThe































