---
title: AlpaSim Challenge 2026
colorFrom: green
colorTo: blue
sdk: docker
app_port: 7860
hf_oauth: true
hf_oauth_scopes:
  - email
---

# AlpaSim Challenge 2026

This Docker Space serves a static landing page with an embedded Gradio app for:

- team registration
- signed-in participant registration status
- public PAI and nuPlan leaderboards
- a reviewer-only `Review` tab for approving or rejecting pending registrations

Participants connect their Hugging Face account from the registration page. The
Space uses the signed-in Hugging Face profile to capture the captain username,
stable Hugging Face `sub`, and email when available.

The Space must define these secrets:

```text
ALPASIM_API_BASE_URL
ALPASIM_REGISTRATION_SECRET
```

For the AWS H100 prototype, `ALPASIM_API_BASE_URL` should point at the
`us-east-1` API Gateway endpoint, for example:

```text
https://<api-id>.execute-api.us-east-1.amazonaws.com
```

Do not commit the registration secret to this repository.

## Tabs

`Registration` lets a signed-in captain submit a team request. Optional fields:
additional submitter Hugging Face usernames, credited contributors, organization,
country/region, and notes. The form is hidden once the signed-in captain has a
pending, approved, or registered team. After approval, listed additional
submitters can connect Hugging Face in this tab and click `Join Team` to bind
their stable Hugging Face `sub` to the approved team.

`PAI Leaderboard` and `nuPlan Leaderboard` load public leaderboard data from
the backend.

`Review` is hidden unless the signed-in Hugging Face user's stable `sub` exists
as an active `reviewer` or `admin` in the `alpasim-reviewers` DynamoDB table. It
lists registrations by status, shows full registration details, and supports
approve/reject actions. Approval grants captain access and leaves any additional
submitter usernames as claimable post-approval invitations.

## Documentation

Capability score computation is documented at:

```text
https://ln2697.github.io/navhard-leaderboard-2/docs/
```

## Soft Open Notes

The nuPlan track currently uses a provisional dataset. Teams may submit during
this period to validate the workflow and understand the evaluation process. When
the updated nuPlan data is available, organizers will clear the nuPlan
leaderboard and resubmit each team's best submission.

The PAI track currently includes a subset of the final scenes. Additional scenes
will be added later in the competition.

Bugs, questions, and competition discussions should be raised on the public
AlpaSim repository:

```text
https://github.com/NVlabs/alpasim
```

## Prizes

Each track will award two NVIDIA DGX prizes:

- PAI-AV track: two NVIDIA DGX prizes for the top two teams.
- nuPlan track: two NVIDIA DGX prizes for the top two teams.

The app serves the landing page from FastAPI at `/` and mounts Gradio at
`/gradio`.