GitHub Copilot vs OpenAI Codex in 2026

GitHub moved Copilot to usage-based AI Credits in June 2026 and now lets you assign work to OpenAI Codex as a third-party agent, while Codex itself expanded to a desktop app, IDE extension, cloud and iOS on every ChatGPT plan.

Updated Oct 26, 2026 · 7 sources checked

The short answer

Copilot is a multi-model assistant for teams on GitHub, with completions in nearly every IDE starting at $10/mo.

Pick GitHub Copilot for teams already on GitHub who want completions in many IDEs plus a background agent that turns issues into pull requests

Pick OpenAI Codex for developers who already pay for ChatGPT and want a coding agent across CLI, IDE, desktop and cloud

At a glance

	GitHub Copilot	OpenAI Codex
Made by	GitHub (Microsoft)	OpenAI
Starts at	$10/moFree plan	$8/moFree plan
All plans	Free (limited); Pro $10/mo; Pro+ $39/mo; Max $100/mo; Business $19/seat/mo; Enterprise $39/seat/mo. Since June 2026 chat and agent use draws on monthly GitHub AI Credits (1 credit = $0.01); Pro includes $15 of credits a month.	Included in ChatGPT Free ($0) and Go ($8/mo) for light use, Plus ($20/mo), Pro (from $100/mo, with $100, $200 and $500 tiers) and Business ($25/user/mo, or $20 billed annually). Enterprise and Edu via sales. Also usable with an API key.
Best for	Teams already on GitHub who want completions in many IDEs plus a background agent that turns issues into pull requests	Developers who already pay for ChatGPT and want a coding agent across CLI, IDE, desktop and cloud

How they score

GitHub CopilotOpenAI Codex

Coding

8.5

9.5

Writing

Reasoning

8.5

9.5

Speed

Context Window

Privacy

7.5

Scores out of 10: our judgment from hands-on use and each vendor's published limits.

GitHub Copilot

by GitHub (Microsoft)

GitHub's AI assistant for code completion, chat, agent mode in the editor, a cloud coding agent you assign issues to, code review and a CLI. It works in VS Code, Visual Studio, JetBrains, Xcode, Neovim, Eclipse and on github.com, and lets you pick models from Anthropic, OpenAI, Google, xAI and others.

Good

Cheapest paid entry point at $10/mo, plus a free tier
Works in the widest range of editors, including Visual Studio, Xcode, JetBrains, Neovim and Eclipse
Model picker includes Claude Opus 5.5 and Sonnet 5.5, GPT-6.1 Sol, Gemini and Grok
Cloud agent and code review built into GitHub issues and pull requests
You can assign tasks to third-party agents such as Claude and OpenAI Codex from GitHub

Watch out

Usage-based AI Credits make heavy agent use harder to budget than a flat plan
The Copilot Free tier caps completions at 2,000 a month
Business and Enterprise admins must set usage limits and decide on extra paid usage
Agent quality depends on which model you choose and how many credits it burns

Visit GitHub Copilot ↗

OpenAI Codex

by OpenAI

OpenAI's coding agent. It runs as an open-source CLI (Apache-2.0), an IDE extension for VS Code, Cursor and Windsurf, a desktop app, Codex cloud on the web, the iOS app and an SDK. It uses OpenAI's GPT-6 family, with GPT-6.1 Sol recommended for complex coding.

Good

Available on every ChatGPT plan, including Free and the $8 Go plan
CLI is open source under Apache-2.0
Runs locally (CLI, IDE extension, desktop app) or as cloud tasks on the web and iOS
Plus includes automatic GitHub code review and a Slack integration
Pro plans currently have no five-hour usage limit

Watch out

Only runs OpenAI models
Usage on Plus is capped per five-hour window and varies a lot by model (for example 15-160 local messages on GPT-6.1 Sol)
Free and Go plans are limited to GPT-6 Luna
OpenAI does not publish a context window figure for the Codex models on its pricing or models pages

Visit OpenAI Codex ↗

Our verdict

Copilot is a multi-model assistant for teams on GitHub, with completions in nearly every IDE starting at $10/mo. Codex is OpenAI's own agent, included with every ChatGPT plan. If your company already pays for Copilot, you can assign tasks to Codex from GitHub without a separate tool. If you pay for ChatGPT and want the strongest GPT agent experience across CLI, desktop and cloud, use Codex directly.

Questions people ask

Can I use Codex from GitHub Copilot?

Yes. GitHub lets you assign tasks to agents including Copilot, Claude by Anthropic and OpenAI Codex, and Copilot's model picker includes GPT-5.x and GPT-6 models such as GPT-6.1 Sol.

Which is cheaper, Copilot or Codex?

Copilot Pro is $10/mo with $15 of AI Credits. Codex is included in ChatGPT Free and Go ($8/mo) for light use and Plus ($20/mo) for regular use. Which is cheaper depends on whether you also want ChatGPT itself.

Does Codex replace Copilot autocomplete?

No. Codex is a task agent. Copilot's code completions and next edit suggestions are its core feature and work in VS Code, Visual Studio, JetBrains, Xcode, Neovim and Eclipse.

Which is better for teams?

Copilot Business ($19/seat) and Enterprise ($39/seat) are built around GitHub organizations, with admin usage controls and pooled credits. ChatGPT Business ($25/user/mo, or $20 billed annually) includes Codex for teams that standardize on OpenAI.

Sources (7), checked Oct 26, 2026