Ellipsis vs OpenAI Codex
| Ellipsis | OpenAI Codex | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | No |
| Paid from | Free | — |
| Open source | No | No |
| Platforms | Web | Web, Windows, macOS, Linux |
| Free plan | Yes | No |
| Chat assistance | — | Yes |
| Coding agent | — | Yes |
| Supported IDEs | — | Visual Studio Code; Cursor; Windsurf; Visual Studio Code Insiders; Xcode; JetBrains IDEs |
| Codebase indexing | — | Yes |
| Terminal access | — | Yes |
Both are listed in Best AI Coding Assistants. On Specifiction, OpenAI Codex scores higher on our published basis.