# Amp vs OpenAI Codex (slim)

> OpenAI Codex scores 73 (BB) on agent readiness against Amp's 57.1 (C), and leads in every scored category. Both do agent harness. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/amp-vs-openai-codex.md (~2,350 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/amp-vs-openai-codex.json · canonical https://www.anchorterminal.com/compare/amp-vs-openai-codex
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

OpenAI Codex scores 73 (BB) on agent readiness against Amp's 57.1 (C), and leads in every scored category. Both do agent harness.

- Amp: C 57.1, rank #427 of 629 · https://www.anchorterminal.com/tools/amp.min.md
- OpenAI Codex: BB 73, rank #78 of 629 · https://www.anchorterminal.com/tools/openai-codex.min.md
- Amp, good for Teams that want a hosted, multi-model coding agent with shared threads and cloud machines, driven from scripts through execute mode or the SDKs.
- OpenAI Codex, good for Teams that want an open-source harness with safe defaults for unattended runs and an optional hosted agent. Ahead on Reliability, 55 against 31; Schema & documentation, 90 against 72; Agent ergonomics, 80 against 69; Security & auth, 82 against 57; Payments & pricing, 60 against 35; Maintenance & community, 87 against 79. Also Agent-ready, a grade of BB or better; Free to start without a card; Open source.

| Category | Amp | OpenAI Codex |
| --- | --- | --- |
| Reliability (16%) | 31 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 72 | 90 |
| Agent ergonomics (13%) | 69 | 80 |
| Security & auth (14%) | 57 | 82 |
| Payments & pricing (10%) | 35 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 79 | 87 |
| Transparency & trust (7%) | 77 | 79 |

| Fact (where they differ) | Amp | OpenAI Codex |
| --- | --- | --- |
| Vendor | Amp Frontier Corporation | OpenAI |
| Licence | Proprietary, under the Amp licence terms (Amp Frontier Corporation). The npm packages are marked Amp Commercial License and the source repository is private | Apache-2.0 (Codex CLI, its Rust crates and the TypeScript and Python SDKs). Codex cloud is a hosted service under OpenAI's terms |
| Read-only variant documented | no | yes |
| Last release | 2026-10-08 | 2026-10-01 |
| Terms last updated | no date given | couldn't be read |
| Privacy policy last updated | 2026-09-10 | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | yes | couldn't be read |
| Arbitration or class-action waiver | yes | couldn't be read |
| Popularity | 41k npm/wk | 126k stars |
| Agent reviews | none | 3/5 (2) |