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

# Claude Cowork

> Route Anthropic's knowledge-work agent through Opper's Anthropic-compatible gateway

[Claude Cowork](https://claude.com/product/cowork) is Anthropic's agent for knowledge work — the same agentic engine as Claude Code, but built for non-technical tasks inside the Claude desktop app, with no terminal required. It works across your local files, folders, and applications while you steer.

Cowork supports third-party inference providers, so it can run on any model in the Opper catalog rather than Claude alone.

## Setup

<Steps>
  <Step title="Enable Developer mode">
    In Cowork's **Help** menu, click **Enable Developer Mode**, then quit and restart the app. A new **Developer** menu appears in the menu bar.
  </Step>

  <Step title="Open the third-party inference dialog">
    From the **Developer** menu, choose **Configure Third-party inference**, then **Gateway (Anthropic-compatible)**.
  </Step>

  <Step title="Add the gateway">
    | Field                   | Value                            |
    | ----------------------- | -------------------------------- |
    | **Gateway base URL**    | `https://api.opper.ai/v3/compat` |
    | **Gateway API key**     | Your Opper API key               |
    | **Gateway auth scheme** | `bearer`                         |

    Click **Apply locally** to try it on your own machine, or **Export** to ship the same configuration as an MDM profile (`.mobileconfig` for macOS, `.reg` for Windows) for a team-wide rollout.
  </Step>
</Steps>

## Choosing a model

Add models to Cowork by their Opper IDs and they appear in its picker. With no [model-access rule](/control-plane/rules/model-access) set, your key reaches the whole catalog; a rule narrows it. A reasonable starting set:

| Use case                               | Models                                                                              |
| -------------------------------------- | ----------------------------------------------------------------------------------- |
| **Claude Sonnet** across major clouds  | `aws/claude-sonnet-4-6-eu` · `azure/claude-sonnet-4-6` · `gcp/claude-sonnet-4-5-eu` |
| **Claude Opus** when you need it       | `aws/claude-opus-4-7` · `azure/claude-opus-4-7` · `gcp/claude-opus-4-7-eu`          |
| **Cheaper routine work** (open-weight) | `evroc/gpt-oss-120b`                                                                |

Once a model is added on the Opper side, it shows up in the Cowork picker on your next conversation. You can switch mid-session without losing chat history.

## Verify

Send any message. The status indicator at the bottom-left should read **`Cowork 3P | Gateway`** — that's how you know the request routed through Opper rather than going to Anthropic directly. From there, calls appear in [traces](/control-plane/trace) with model, latency, and tokens.

## Troubleshooting

<AccordionGroup>
  <Accordion title="The Developer menu never appears">
    Cowork needs a full quit and restart after enabling Developer Mode — closing the window isn't enough.
  </Accordion>

  <Accordion title="The model picker is empty">
    Cowork lists the models you entered in the third-party inference dialog — it does not fetch the catalog. Add at least one model ID there. If a model you added is rejected, check your [model-access rules](/control-plane/rules/model-access) aren't denying it.
  </Accordion>

  <Accordion title="The status still reads 1P">
    The gateway config didn't apply. Re-open **Developer → Configure Third-party inference** and confirm the auth scheme is `bearer`.
  </Accordion>
</AccordionGroup>

## Related

<CardGroup cols={2}>
  <Card title="Claude Desktop" icon="https://mintcdn.com/opper/H-iiE_tAhHpUz1kK/images/tools/claude-code.svg?fit=max&auto=format&n=H-iiE_tAhHpUz1kK&q=85&s=3411d7c0de4849994f0084a85652fbc5" href="/integrations/personal-agents/claude-desktop" width="100" height="100" data-path="images/tools/claude-code.svg">
    Anthropic's desktop app, wired by the Opper CLI.
  </Card>

  <Card title="Retention rules" icon="shield" href="/control-plane/rules/retention">
    Pin residency and retention for knowledge work.
  </Card>
</CardGroup>