Alternatives

Products that do what CodexA does

Open-source AI code intelligence engine for developers.

1. 1
   Codex by OpenAI▲955

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2. 2
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3. 3
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4. 4
   CodeX▲124

   Build webapps in minutes for completely free

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5. 5
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6. 6
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7. 7
   Codex​​▲247

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8. 8
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   Codex now runs natively on Windows with secure sandbox

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9. 9OC
   Open Codex – OpenAI Codex CLI with open-source LLMs▲106

   Hey HN, I’ve built Open Codex, a fully local, open-source alternative to OpenAI’s Codex CLI. My initial plan was to fork their project and extend it. I even started doing that. But it turned out their code has several leaky abstractions, which made it hard to override core behavior cleanly. Shortly after, OpenAI introduced breaking changes. Maintaining my customizations on top became increasingly difficult. So I rewrote the whole thing from scratch using Python. My version is designed to support local LLMs. Right now, it only works with phi-4-mini (GGUF) via…

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10. 10
    Codex Subagents▲306

    Parallel custom agents for complex tasks

    Mar 2026 · learn.chatgpt.com

11. 11IB
    I built an AI that turns GitHub codebases into easy tutorials▲923

    https://the-pocket.github.io/Tutorial-Codebase-Knowledge/

    2025 · github.com

12. 12
    Codex Security▲306

    Our application security agent

    Mar 2026 · openai.com

13. 13
    OpenCode Superapp▲128

    The power of Codex with local, self-hosted models and voice

    Jul 2026 · opencodesuper.app

14. 14
    Codex Plugins▲202

    Package Codex skills and app integrations as plugins

    Mar 2026 · learn.chatgpt.com

15. 15
    Coda AI▲284

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16. 16
    Coda 4.0▲258

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17. 17
    opencode▲395

    Your terminal's AI agent, with any model you want

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18. 18
    ShioriCode▲119

    Open-source alternative to Codex & Claude Code

    May 2026 · shiori.ai

19. 19
    Everything OpenAI Codex▲7

    An open-source workflow OS for OpenAI Codex.

    May 2026 · github.com

20. 20
    GitHub Agent HQ▲192

    Run Claude, Codex & Copilot directly in GitHub & VS Code

    Feb 2026 · github.blog

21. 21
    GPT‑5.3‑Codex‑Spark▲277

    An ultra-fast model for real-time coding in Codex

    Feb 2026 · openai.com

22. 22
    Content Codex▲314

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23. 23
    CommandDash▲272

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24. 24
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