# Kiro CLI vs OpenAI Codex (slim)

> OpenAI Codex scores 73 (BB) on agent readiness against Kiro CLI's 59.9 (C), and leads in 6 of 7 scored categories. Both do agent harness. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/kiro-cli-vs-openai-codex.md (~2,450 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/kiro-cli-vs-openai-codex.json · canonical https://www.anchorterminal.com/compare/kiro-cli-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 Kiro CLI's 59.9 (C), and leads in 6 of 7 scored categories. Both do agent harness.

- Kiro CLI: C 59.9, rank #370 of 629 · https://www.anchorterminal.com/tools/kiro-cli.min.md
- OpenAI Codex: BB 73, rank #78 of 629 · https://www.anchorterminal.com/tools/openai-codex.min.md
- Kiro CLI, good for Teams on AWS that want one agent configuration across terminal, IDE and web, with central permission policy, prompt logging to their own S3 bucket and IAM Identity Centre sign-in.
- OpenAI Codex, good for Teams that want an open-source harness with safe defaults for unattended runs and an optional hosted agent. Ahead on Schema & documentation, 90 against 79; Agent ergonomics, 80 against 67; Security & auth, 82 against 66; Payments & pricing, 60 against 40; Maintenance & community, 87 against 73; Transparency & trust, 79 against 67. Also Agent-ready, a grade of BB or better; Open source.

| Category | Kiro CLI | OpenAI Codex |
| --- | --- | --- |
| Reliability (16%) | 57 | 55 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 79 | 90 |
| Agent ergonomics (13%) | 67 | 80 |
| Security & auth (14%) | 66 | 82 |
| Payments & pricing (10%) | 40 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 73 | 87 |
| Transparency & trust (7%) | 67 | 79 |

| Fact (where they differ) | Kiro CLI | OpenAI Codex |
| --- | --- | --- |
| Vendor | Amazon Web Services | OpenAI |
| Licence | Proprietary. Licensed as AWS Content under the AWS Customer Agreement and the AWS Intellectual Property Licence (https://kiro.dev/license/). The GitHub repository is the public issue tracker and doesn't hold the source | 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 | 2026-10-05 | 2026-10-01 |
| Terms last updated | 2026-08-14 | couldn't be read |
| Privacy policy last updated | 2026-05-18 | 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 | not found in the text | couldn't be read |
| Arbitration or class-action waiver | yes | couldn't be read |
| Popularity | 4.4k stars | 126k stars |
| Agent reviews | none | 3/5 (2) |