AI · alternatives · 2026
24 alternatives to OpenAI Codex for Free with GitHub Models
Drop-in Codex AI agent with GitHub Models. GitHub Gist: instantly share code, notes, and snippets.
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1
Codex by OpenAI▲954OpenAI's smartest and most intuitive to use model yet
2021 · openai.com · its alternatives →
- 2
https://the-pocket.github.io/Tutorial-Codebase-Knowledge/
2025 · github.com · its alternatives →
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GitHub Agent HQ▲192Run Claude, Codex & Copilot directly in GitHub & VS Code
Feb 2026 · github.blog · its alternatives →
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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 · its alternatives →
- 5
opencode▲393Your terminal's AI agent, with any model you want
2025 · opencode.ai · its alternatives →
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The power of Codex with local, self-hosted models and voice
Jul 2026 · opencodesuper.app · its alternatives →
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Codex Subagents▲300Parallel custom agents for complex tasks
Mar 2026 · learn.chatgpt.com · its alternatives →
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hi guys. been working on something i think is fundamentally missing in today's workflow with ai agents. vcs. i find myself struggling with questions that agents can't answer like "why did you do it?", "when did u delete this folder? why?", etc. or trying to /rewind (after a /compact...) or basically `bisect` to find when and why something was done by the agent in the current / previous session. just like git did for code, i think we are the same core capabilities with ai agents so... i developed an open source solution for that (currently supporting claude code) would love to…
May 2026 · github.com · its alternatives →
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Open Agents▲161OpenAgents - The collaboration OS for AI agents. Contribute to openagents-org/openagents development by creating an account on GitHub.
Apr 2026 · open-agents.dev · its alternatives →
- 11
CodeX-Editor▲125A web code editor with AI & multi-language support
2025 · x-codex.vercel.app · its alternatives →
- 12
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Codex now runs natively on Windows with secure sandbox
Mar 2026 · learn.chatgpt.com · its alternatives →
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Open-source Computer Use MCP for AI agents
May 2026 · github.com · its alternatives →
- 16
I've been building computer-use tools for a while, and I quietly launched this about a month ago (122 Stars on GH). I figured it was worth sharing here. Over the last few months, a lot of computer-use agents have come out: Codex, Claude Code, CUA, and others. Most of them seem to work roughly like this: 1. Take a screenshot 2. Have the model predict pixel coordinates 3. Click x,y 4. Take another screenshot 5. Repeat That works, but it's slow, expensive in tokens, and fragile. If the UI shifts a few pixels, things break. And the model still doesn't know what any element actually is. But the…
May 2026 · github.com · its alternatives →
- 17AD
While reading Agentic Design Patterns by Antonio Gulli, I wanted to see how these patterns look in real code. I cloned the OpenAI Codex repo (the open-source AI coding assistant that recently trended on HN) — but it was in Rust. So, I used an Cursor to help me extract and translate 18+ agentic patterns from Codex’s codebase into Python. That small experiment turned into a full open-source guide: GitHub: Codex Agentic Patterns https://github.com/artvandelay/codex-agentic-patterns Each pattern comes with: A short explanation and code sample A runnable exercise and agent…
2025 · artvandelay.github.io · its alternatives →
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GitChat▲48AI agent for GitHub pull request summaries and chat
2024 · gitchat.dev · its alternatives →
- 20
Action library for AI Agent. Contribute to sheet0/npi development by creating an account on GitHub.
2024 · github.com · its alternatives →
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Code▲20Hey HN, Today we're launching Code, a community-driven, open-source coding agent for your terminal. It's a fork of OpenAI's codex with a focus on developer ergonomics and local control. Key features: - Browser integration – attach to your Chrome via CDP or use a built-in headless browser. You can browse pages, run the CLI in a browser session, and even take screenshots from the terminal. - Multi-agent commands – /plan, /solve and /code orchestrate multiple models (ChatGPT, Claude, Gemini) to propose and implement solutions, with consensus or race options. - Diff viewer – see…
2025 · github.com · its alternatives →
- 24
An open-source workflow OS for OpenAI Codex.
May 2026 · github.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →