OpenAI
Codex CLI
Codex CLI is a coding agent for the terminal by OpenAI.
85out of 100As of November 4, 2026
Summary
Codex CLI is OpenAI's coding agent for the terminal. Its first npm package was published on April 16, 2025. Besides the command line there is an IDE extension and a cloud agent.
The source code is public on GitHub under the Apache-2.0 license. OpenAI names GPT-6.1 Sol and GPT-6 Luna as its models. Codex CLI runs on macOS, Windows and Linux.
It starts with the Go plan at $8 per month. Alternatively you connect an API key and pay by usage.
Popularity
How often the harness is searched for, used and mentioned, compared with every harness in the directory.
The most popular AI harnesses
Popularity index from 0 to 100, higher is more popular.
20 of 31 models
As of November 4, 2026 · Source: gradually.ai popularity index
Over time
Values from April 30, 2025 to November 4, 2026
Codex CLIClaude CodeOpenCodeGemini CLIPi
Subscriptions with Codex CLI
Plans from the AI subscription directory that include the harness. Cheapest first.
| Plan | Provider | Price | Checked |
|---|---|---|---|
| ChatGPT Free | OpenAI | free | Sep 29, 2026 |
| ChatGPT Plus | OpenAI | $20.00 | Sep 29, 2026 |
| ChatGPT Business Standard-Platz | OpenAI | $25.00or $20.00/month billed annually | Sep 29, 2026 |
| ChatGPT Pro $100 | OpenAI | $100.00 | Sep 29, 2026 |
| ChatGPT Business Premium-Platz | OpenAI | $125.00or $100.00/month billed annually | Sep 29, 2026 |
| ChatGPT Pro $200 | OpenAI | $200.00 | Sep 29, 2026 |
| ChatGPT Pro $500 | OpenAI | $500.00 | Oct 8, 2026 |
| ChatGPT Enterprise Enterprise | OpenAI | on request | Sep 29, 2026 |
Changelog
Every update and new release of Codex CLI is in the changelog.
Sources
Every fact on this profile rests on one of these sources. The date is the day the source was read.
| Source | Backs | Read on |
|---|---|---|
| registry.npmjs.org/@openai/codex | Launch date, License, npm package (popularity index) | November 5, 2026 |
| api.github.com/repos/openai/codex | Open source, GitHub repository (popularity index) | November 5, 2026 |
| learn.chatgpt.com/docs/pricing | Entry price, Models | November 5, 2026 |
| learn.chatgpt.com/docs/app/windows | Platforms | November 5, 2026 |
| marketplace.visualstudio.com/_apis/public/gallery/extensionquery | VS Code extension (popularity index) | November 5, 2026 |
| open-vsx.org/api/openai/chatgpt | Open VSX extension (popularity index) | November 5, 2026 |
| npmjs.com/package/@openai/codex | npm package (popularity index) | November 5, 2026 |
| marketplace.visualstudio.com/items | VS Code extension (popularity index) | November 5, 2026 |
| open-vsx.org/extension/openai/chatgpt | Open VSX extension (popularity index) | November 5, 2026 |
| github.com/openai/codex | GitHub repository (popularity index) | November 5, 2026 |