GitHub Copilot vs OpenAI Codex
Pricing
GitHub Copilot: Free tier, Pro from $10/mo
OpenAI Codex: Included in ChatGPT plans (Plus $20/mo, Pro from $100/mo), limited use on Free and Go
Description
GitHub Copilot: GitHub's AI coding assistant: inline suggestions, chat, and agent mode right in your editor
OpenAI Codex: OpenAI's coding agent, which works in the ChatGPT desktop app, your terminal, your editor and the cloud on your ChatGPT plan
Pros
- Works everywhere: VS Code, JetBrains, Neovim, Xcode, even the CLI
- Free tier is enough to see if AI coding helps your workflow
- $10/mo Pro is the cheapest paid option from a major player
- Runs in the ChatGPT desktop app, the CLI, an IDE extension and on the web, all tied to one ChatGPT account
- Cloud tasks keep going after you close your laptop, in a reusable environment for each repo
- Reviews GitHub pull requests when you tag @Codex or turn on automatic reviews
Cons
- Suggestions can be generic, less context-aware than Cursor or Cody
- Agent mode is newer and still catching up to Cursor and Cline
- Free tier limits you to 2,000 completions/month
- Free and Go plans only get limited use in the desktop app, on the smaller GPT-6 Luna model
- Plus usage is counted per five-hour window and weekly limits can also apply, and how far it goes depends on the model and the size of the task
- Running it on an API key instead of a plan drops the cloud features, such as GitHub code review and Slack
Details
Copilot is the safe default. It works in almost every editor, the price is right, and if you already use GitHub for your repos, it plugs in without any extra setup. The inline suggestions are good for everyday coding: writing boilerplate, completing function signatures, filling in repetitive patterns.
Where it falls short compared to newer tools is deep project understanding. Cursor and Cline can reason about your entire codebase; Copilot’s context window is more limited. The newer agent mode is improving this, but it is still playing catch-up. If you just want solid autocomplete at a low price, Copilot is hard to beat. If you want an AI that can refactor across 20 files, look elsewhere.
Codex is OpenAI’s coding agent. You hand it a task, such as a hard-to-find bug, a refactor or a new feature, and it reads the code, makes the changes and checks its own work, using browser and computer tools where it needs them. It can run several agents in parallel, and cloud tasks carry on while your laptop is closed.
It comes with ChatGPT, so if you already pay for Plus you already have it. The same account works in the desktop app, the terminal, your editor and on iOS.
OpenAI describes Plus at $20/month as enough for a few focused coding sessions a week. Heavier use means Pro, from $100/month, which currently has no five-hour limit, or buying extra credits when you hit the limit. You can also run the CLI on an API key and pay standard API rates, which suits automation such as CI.
GitHub Copilot verified
OpenAI Codex verified
