GitHub (Microsoft)
GitHub Copilot
Best for: Developers who want AI help inside the editor they already use.
OpenAI · Coding tools
Codex
OpenAI’s coding agent, available in ChatGPT, the command line and IDE extensions.
Best for
ChatGPT subscribers who want an agent for coding tasks.
Worth knowing
Capabilities and limits are tied to your ChatGPT plan.
Latest Codex news
- ChatGPT-6 Astra plays World of Warcraft 'blind' and clears the orc starting zone in 40 minutes with no deaths ↗Tom’s Hardware · Oct 3
- OpenAI DevDay 2026 Recap for Developers ↗InfoQ · Oct 2
- Chatham scales its capital markets expertise with OpenAI ↗OpenAI · Oct 2
- How NVIDIA GPUs Help Accelerate OpenAI’s GPT-6 Astra Ultrafast ↗NVIDIA · Oct 1
- DevDay 2026 Recap ↗OpenAI · Sep 29
- Are you a Codex Original? ↗OpenAI · Sep 28
- Proaction boosts sales 60% and saves 75+ hours with Codex ↗OpenAI · Sep 25
Alternatives
Anysphere
Cursor
Best for: Developers who want AI woven through the whole editor.
Anthropic
Claude Code
Best for: Delegating multi-step coding tasks across a codebase.
Replit
Replit
Best for: Prototyping and deploying small apps without local setup.