Alternatives

Products that do what Everything OpenAI Codex does

An open-source workflow OS for OpenAI Codex.

1. 1
   Codex by OpenAI▲955

   AI that writes code for you

   2021 · openai.com

2. 2
   Codex by OpenAI▲346

   A command center for working with agents

   Feb 2026

3. 3
   CodeX▲124

   Build webapps in minutes for completely free

   2025

4. 4
   Codex app for Windows▲145

   Codex now runs natively on Windows with secure sandbox

   Mar 2026

5. 5
   OpenCode Superapp▲128

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

   Jul 2026 · opencodesuper.app

6. 6
   GPT-5 Codex▲358

   A version of GPT-5 better at agentic coding

   Sep 2025

7. 7
   Codex by ChatGPT▲401

   Cloud agent for parallel dev tasks, powered by Codex-1

   2025

8. 8OC
   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…

   2025 · github.com

9. 9
   Codex Subagents▲306

   Parallel custom agents for complex tasks

   Mar 2026

10. 10
    CodeX-Editor▲125

    A web code editor with AI & multi-language support

    2025

11. 11
    OpenAI Open Models▲480

    gpt-oss-120b and gpt-oss-20b open-weight language models

    2025

12. 12
    Agenta▲362

    Open-source prompt management & evals for AI teams

    Nov 2025

13. 13
    Codex Plugins▲202

    Package Codex skills and app integrations as plugins

    Mar 2026

14. 14
    opencode▲395

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

    2025

15. 15
    Open Computer Use▲92

    Open-source Computer Use MCP for AI agents

    May 2026 · github.com

16. 16
    Axel▲271

    Todoist for AI coding agents

    Feb 2026

17. 17
    AgentMicro▲160

    Live Codex task status in your macOS menu bar

    Aug 2026 · agentmicro.cc

18. 18
    ShioriCode▲119

    Open-source alternative to Codex & Claude Code

    May 2026 · shiori.ai

19. 19
    Lukan AI Agent, IDE and workstation.▲92

    The open-source AI workstation for coding, ops, and life

    Apr 2026

20. 20
    GitHub Agent HQ▲192

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

    Feb 2026

21. 21
    OpenAI o3 and o4-mini▲142

    Advanced Visual Reasoning & Agentic Tool Use

    2025

22. 22
    Workspace agents in ChatGPT▲105

    Codex-powered agents for teams.

    Apr 2026 · openai.com

23. 23
    OpenYak▲114

    The open-source Claude Desktop with any model you want

    Apr 2026

24. 24
    AgentNotch▲120

    Real-time AI coding assistant telemetry in your Mac's notch

    Jan 2026

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