GitHub Copilot vs OpenAI Codex

Pick up to 4 tools and see their free plans, entry prices, platforms and limits in one table. Every fact comes from each vendor's own pages, checked 27 October 2026.

Written head to head: GitHub Copilot vs OpenAI Codex, with when to choose each side.

Compared on	GitHub Copilot Free plan · from $10/mo Visit Remove	OpenAI Codex Free plan · from $8/mo Visit Remove
What it is	GitHub's AI coding assistant for code completion, chat, agents and review	OpenAI's coding agent for the terminal, IDEs, desktop app and cloud
Free plan	2,000 code completions per month and a limited monthly allowance of AI credits for chat and agent features; models by auto selection; agent mode and Copilot CLI included; no cloud agent or code review; no credit card required	ChatGPT Free includes limited Codex use for quick coding tasks; Free and Go use GPT-6 Luna at standard speed in the desktop app, subject to rollout
Cheapest paid plan	$10/mo (Pro)GitHub Copilot pricing	$8/mo (ChatGPT Go)OpenAI Codex pricing
What it covers	Unlimited code completions and next edit suggestions; 1,500 AI credits a month (1,000 base and 500 flex).	Codex comes with ChatGPT plans; Plus ($20/month) expands Codex usage. Codex can also be used with an API key at standard API rates.
Free trial	None stated	None stated
Platforms	Web, macOS, Windows, Linux	macOS, Windows, Linux, Web, API
Integrations (vendor's figure)	Not stated	Not stated
Open source	No	Yes
Good for	Getting code suggestions while writing scripts or apps Asking questions about an unfamiliar codebase Reviewing pull requests before merging	Building a small feature from a plain-language description Reviewing code changes before merging Investigating and fixing failing builds
Watch out for	The Free plan is capped at 2,000 completions per month Paid plans include a monthly AI credit allowance (1,500 on Pro); extra usage costs $0.01 per credit Cloud agent and code review are not in the Free plan	Usage limits depend on the ChatGPT plan, the model and task size, measured per five-hour window Free and Go include only limited Codex access API-key use is billed separately at API rates
Made by	GitHub (Microsoft)	OpenAI

Entry prices are the cheapest paid plan, as each vendor publishes it; “What it covers” says what that price is per (a user, a channel, a brand, a number of contacts). The sources are listed on each tool's page.

Add a tool

Every tool in AI coding assistants is on its category page, with the written head-to-heads on Compare.