CodexZero recorded the largest token reduction in our completed comparisons. In the strongest repeated benchmark, it:
- used 15% fewer tokens
- matched Codex’s 29/36 task score
- processed 3.89 million fewer tokens
- ran the same 12 software tasks three times per setup
CodexZero installs beside Codex. Your regular CLI remains available, and the full command result stays available whenever Codex needs it.
irm https://raw.githubusercontent.com/Retro2512/CodexZero/main/scripts/bootstrap.ps1 | iexcurl -fsSL https://raw.githubusercontent.com/Retro2512/CodexZero/main/scripts/bootstrap.sh | shRelease packages include the runtime. Supported targets are Windows x64, Intel Mac, and Apple silicon Mac.
Prefer to inspect the installer first? Open the Windows script, macOS script, or latest release.
codex-zero run
Use the optimized side-by-side CLI.
codex-zero savings
See the tokens CodexZero saved on your own work.
codex-zero stock
Open regular Codex at any time.
Codex and CodexZero each completed 12 software tasks three times. CodexZero matched the final task score while processing 22.69 million tokens instead of 26.58 million.
CodexZero keeps the original command result available, removes repeated text when that produces a smaller result, and otherwise leaves the result alone.
- Your command runs normally.
- CodexZero saves the full result locally.
- Repeated output can be represented more briefly.
- If the shorter result does not save tokens, Codex receives the original.
Your model, reasoning level, tools, project instructions, permissions, and existing Codex installation remain under your control.
Standard is the default and keeps Codex’s normal model instructions. This is the setting used for the repeated 15% result.
codex-zero mode safe
Max Savings uses a leaner setup for repeatable work. Switch back whenever you want.
codex-zero mode max-save
- Windows x64
- Intel Mac
- Apple silicon Mac
- Codex CLI and Codex Desktop
- Node.js 20+ for source-checkout development
For Desktop, quit Codex completely before running:
codex-zero desktop
- CodexZero is free and open source under the MIT license.
- Regular Codex remains available through
codex-zero stock. - Full command results stay available locally.
- Errors, warnings, exit codes, and non-repeated lines are preserved.
codex-zero savingsreports measured local results rather than a universal estimate.
Token reductions do not translate directly into the same percentage reduction on every bill or plan. Output, caching, pricing, and workload shape the final result.
CodexZero is an independent project and is not an official OpenAI product.