# Kilo Code CLI vs OpenAI Codex

> Kilo Code CLI scores 75.4 (BB) on agent readiness against OpenAI Codex's 73 (BB), and leads in 1 of 7 scored categories. OpenAI Codex leads on agent ergonomics, security & auth and payments & pricing. Both do agent harness. Category scores, facts, verdicts and agent notes side…

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- Updated: 2026-10-09

Kilo Code CLI scores 75.4 (BB) on agent readiness against OpenAI Codex's 73 (BB), and leads in 1 of 7 scored categories. OpenAI Codex leads on agent ergonomics, security & auth and payments & pricing. Both do agent harness.

- Kilo Code CLI: grade BB, 75.4/100, rank #47 of 842. Markdown https://www.anchorterminal.com/tools/kilo-code-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/kilo-code-cli.json
- OpenAI Codex: grade BB, 73/100, rank #92 of 842. Markdown https://www.anchorterminal.com/tools/openai-codex.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-codex.json

## Which one, for what

### Kilo Code CLI (BB)

Good for: Developers who want an open-source terminal agent with per-tool permission rules, an optional sandbox and a choice of provider, and the same engine in VS Code and JetBrains.

Ahead on:
- Reliability, 85 against 55

Watch for: Telemetry to PostHog is on by default, and the privacy policy and PRIVACY.md don't mention it

### OpenAI Codex (BB)

Good for: Teams that want an open-source harness with safe defaults for unattended runs and an optional hosted agent.

Ahead on:
- Agent ergonomics, 80 against 72
- Security & auth, 82 against 66
- Payments & pricing, 60 against 50

Watch for: Pre-1.0 at 0.160.0, with a minor every few days and no breaking-change section in release notes


## Score by category

| Category | Weight | Kilo Code CLI | OpenAI Codex | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 85 | 55 | Kilo Code CLI +30 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 90 | 90 | even |
| Agent ergonomics | 13% (16.2 this run) | 72 | 80 | OpenAI Codex +8 |
| Security & auth | 14% (17.5 this run) | 66 | 82 | OpenAI Codex +16 |
| Payments & pricing | 10% (12.5 this run) | 50 | 60 | OpenAI Codex +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 87 | even |
| Transparency & trust | 7% (8.8 this run) | 76 | 79 | OpenAI Codex +3 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **75.4 · BB** | **73 · BB** | |

## Facts side by side

| Fact | Kilo Code CLI | OpenAI Codex |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Kilo Code Inc. | OpenAI |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | MIT | 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 |
| llms.txt | yes | yes |
| Last release | 2026-10-07 | 2026-10-01 |
| Terms last updated | 2026-09-30 | couldn't be read |
| Privacy policy last updated | 2026-05-29 | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | yes | 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 | 28k stars, 33k npm/wk | 126k stars |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**Kilo Code CLI.** Shell commands ask before running by default, and an optional operating-system sandbox blocks writes outside the workspace and outbound network. Telemetry to PostHog is on by default and the sandbox is off, so an unattended `kilo run --auto` approves everything not denied unless both are configured first.

**OpenAI Codex.** Sandbox on by default on macOS, Linux and Windows, with the network off and `.git` and `.codex` read-only. Pre-1.0 at 0.160.0, with a minor every few days and no breaking-change section in release notes.

## Before you call either

### Kilo Code CLI

1. Set `sandbox.enabled` to true in the global `kilo.jsonc` before `kilo run --auto`. `--auto` approves every permission request not explicitly denied
2. Set `experimental.openTelemetry` to false, or `KILO_TELEMETRY_LEVEL` to a value other than `all`, to stop telemetry
3. Add needed hosts to `sandbox.allowed_hosts` in global config. MCP tool calls are unavailable while network restriction is on
4. Without `--auto` a non-interactive run rejects every permission prompt and exits 1
5. Put provider keys in global config or the environment. `{env:VAR}` in a project `kilo.json` is ignored

### OpenAI Codex

1. Run `codex exec --json` in pipelines, with `--output-schema` when the final message has to parse
2. Keep the default sandbox. `--yolo` removes both the sandbox and approvals
3. Set `network_access = true` under `[sandbox_workspace_write]` only for tasks that need it. Network is off by default
4. Set `[analytics] enabled = false` and `[feedback] enabled = false` in config.toml to keep usage data local
5. Pin the npm version. A 0.x minor lands every few days

## Questions

### Which is better for AI agents, Kilo Code CLI or OpenAI Codex?

Kilo Code CLI scores 75.4 (BB) on agent readiness against OpenAI Codex's 73 (BB), and leads in 1 of 7 scored categories. OpenAI Codex leads on agent ergonomics, security & auth and payments & pricing.

### Are Kilo Code CLI and OpenAI Codex open source?

Yes. Kilo Code CLI is open source (MIT). OpenAI Codex is open 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).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/kilo-code-cli-vs-openai-codex.json, and with the fewest tokens: https://www.anchorterminal.com/compare/kilo-code-cli-vs-openai-codex.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "kilo-code-cli", "b": "openai-codex"}`. From a terminal: `anchor compare kilo-code-cli openai-codex`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/kilo-code-cli.json and https://www.anchorterminal.com/api/v1/tools/openai-codex.json

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