# Browse 41 harnesses

## 30-day usage· **Aug 12–Sep 10, 2026**

Data as of September 11, 2026 · [About the data](/content/rankings/index.html)

Rank **#9**#8 of21CLI agents · 7-day #8

Tokens **3.6T**

Requests **50.4M**

## Capabilities and verification

Reviewed against the HarnessRouter capability catalog on August 24, 2026. Every verified row cites its public source; rule-derived rows apply HarnessRouter's published classification rules to documented behavior. A “No public evidence” badge marks a gap in the public record, not a statement that Codex lacks them.

### Configuration & support

- **Other models** Directly verified
- **Custom instructions** Directly verified
- **Skills** Directly verified
- **Custom tools** No public evidence
- **MCP** Directly verified
- **Sandbox & approvals** Directly verified
- **Sessions** Directly verified
- **Subagents** Directly verified

### Execution & agency

- **Workspace files** Directly verified
- **Structured actions** Directly verified

### Environment control

- **Browser control** Directly verified
- **Computer control** Directly verified

### Observation & capture

- **Screen observation** Directly verified
- **Screenshot export** Directly verified
- **Recording export** No public evidence

### Artifact outputs

- **Documents** Directly verified
- **Spreadsheets** Directly verified
- **Presentations** Directly verified
- **Images** Directly verified
- **Video** Rule-derived
- **App deployment** Directly verified

Sources: openai.com · developers.openai.com

### Machine interfaces

- Headless CLI · Stable

## Benchmark evidence

Codex configurations from the HarnessRouter Care Prep benchmark, published August 10, 2026. One controlled synthetic-data task; results apply to this test, not universally.

| Model    | End-to-end latency | Cost          |
| -------- | ------------------ | ------------- |
| gpt-5.2 | 4m 36s            | 0.72 credits  |
| gpt-5.5 | 2m 46s            | 59.7 credits  |

Execution success and strict grounding pass rates for these configurations are published in the observed-history capture on the benchmark report.

[See the full benchmark report](/content/benchmarks/index.html)

## Run Codex through HarnessRouter

API harness ID: `codex`

Use it for code-related work that your product can review.

[Create an API key and run your first task](https://app.harnessrouter.ai/login?ref=harness-run-it)

[Run a task](/content/docs/run-a-task/index.html) [Harnesses API](/content/docs/harnesses-api/index.html)