> ## Documentation Index
> Fetch the complete documentation index at: https://developer.opus.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Manhours

> Understand how Opus measures and bills usage through Manhours.

Manhours are Opus's unit of measurement for usage. They represent the work your jobs do. You're only charged when a job completes successfully—failed jobs don't cost anything.

## How Manhours Work

| Term                  | What it means                                                                                                              |
| --------------------- | -------------------------------------------------------------------------------------------------------------------------- |
| **Estimate**          | What Opus thinks the job will cost before it runs                                                                          |
| **Actual charge**     | What you actually pay, based on what ran                                                                                   |
| **Conditional paths** | If your workflow has branches, the estimate shows the most expensive path—but you only pay for the path that actually runs |

<Note>
  Estimates are always worst-case. Your actual charge is often lower.
</Note>

## When You're Charged

### Jobs

You're only charged when a job completes successfully:

| Job status    | Charged? |
| ------------- | -------- |
| Created       | No       |
| Queued        | No       |
| Running       | No       |
| **Completed** | **Yes**  |
| Failed        | No       |

<Tip>
  If a job fails, you don't pay—so you can retry without worrying about double charges.
</Tip>

### Builder Activities

Manhours are also consumed when:

* **Running previews** in the Builder to test your workflows
* **Using Prompt to Workflow** to generate workflows from natural language
* **Using Opus AI Assist** to edit and modify workflows in the Builder

## Viewing Your Usage

Every charge is logged with full details:

* When it happened
* Which workflow and workspace
* How many Manhours were used
* Your remaining balance
* Who ran the job

Find this log in **Organization settings → Plan & Usage → Usage**.

## Related Resources

<CardGroup cols={2}>
  <Card title="Jobs" icon="play" href="/guides/jobs">
    Learn how to run workflows and track results.
  </Card>

  <Card title="Organization" icon="building" href="/guides/organization">
    Manage Manhour allocation across your organization.
  </Card>
</CardGroup>