OpenAI Codex CLI vs GitHub Copilot

Pick two tools from the same category to compare side-by-side.

	OpenAI Codex CLI OpenAI's official terminal coding agent; adopts the SKILL.md standard.	GitHub Copilot GitHub's AI pair programmer with an in-IDE agent mode and a cloud coding agent that turns assigned issues into pull requests.
Category	harness	harness
Vendor type	open source	commercial
Pricing	freemium	subscription
Strengths	+ Adopts cross-vendor SKILL.md standard + Open source + Native OpenAI Responses API integration	+ Deep GitHub integration: issue-to-PR workflow, code review, Actions-based execution + Works across five major IDEs plus a CLI + Multi-model choice including Claude and GPT families + Enterprise policy controls, spend limits, and IP indemnity
Tradeoffs	− Smaller plugin ecosystem than Claude Code	− June 2026 shift to token-based AI Credits makes heavy agent usage costs less predictable − Closed source and tightly coupled to the GitHub platform − Cloud agent runs are constrained to GitHub-hosted environments
Used in stacks	0	0