> ## Documentation Index
> Fetch the complete documentation index at: https://allhandsai-docs-custom-tools-agent-server-extra-path.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Modal Runtime

<Note>
  This page documents **legacy OpenHands V0** behavior. For the current V1
  sandbox model, see [Sandboxes (V1)](/openhands/usage/sandboxes/overview).
</Note>

Our partners at [Modal](https://modal.com/) have provided a runtime for OpenHands.
To use the Modal Runtime, create an account, and then [create an API key.](https://modal.com/settings)

You'll then need to set the following environment variables when starting OpenHands:

```bash theme={null}
docker run # ...
    -e RUNTIME=modal \
    -e MODAL_API_TOKEN_ID="your-id" \
    -e MODAL_API_TOKEN_SECRET="modal-api-key" \
```