# GitHub Copilot CLI vs OpenAI Codex (slim)

> OpenAI Codex has a score of 73.4 (BB) against GitHub Copilot CLI's 57.9 (C). Both do agent harness. The largest gap is security & auth, 22 points. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/github-copilot-cli-vs-openai-codex.md (~1,700 tokens) · this version ~380 tokens · JSON https://www.anchorterminal.com/compare/github-copilot-cli-vs-openai-codex.json · canonical https://www.anchorterminal.com/compare/github-copilot-cli-vs-openai-codex
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-05

OpenAI Codex has a score of 73.4 (BB) against GitHub Copilot CLI's 57.9 (C). Both do agent harness. The largest gap is security & auth, 22 points.

- GitHub Copilot CLI: C 57.9, rank #286 of 452 · https://www.anchorterminal.com/tools/github-copilot-cli.min.md
- OpenAI Codex: BB 73.4, rank #58 of 452 · https://www.anchorterminal.com/tools/openai-codex.min.md
- Pick GitHub Copilot CLI for nothing in particular. Pick OpenAI Codex for schema & documentation (+18), agent ergonomics (+8), security & auth (+22), payments & pricing (+20), maintenance & community (+10), transparency & trust (+11).

| Category | GitHub Copilot CLI | OpenAI Codex |
| --- | --- | --- |
| Reliability (16%) | 55 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 72 | 90 |
| Agent ergonomics (13%) | 72 | 80 |
| Security & auth (14%) | 60 | 82 |
| Payments & pricing (10%) | 40 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 77 | 87 |
| Transparency & trust (7%) | 72 | 83 |