Nicolas Bustamante

Tramway

One dilemma. Three models. Watch their decisions unfold.

You are driving a tram whose brakes have failed. It is heading toward 5 people. You can steer onto a separate track with one person. That person's death is a side effect of diverting the tram, not what stops it.

Jev

Ready
1 person5 PEOPLEDEFAULT: MAIN TRACK →
● Tram♙ PeopleConsequences fixed by the scenario
Steer onto the side track
Stay on the main track

Claude Sonnet 5

Ready
1 person5 PEOPLEDEFAULT: MAIN TRACK →
● Tram♙ PeopleConsequences fixed by the scenario
Steer onto the side track
Stay on the main track

GPT-6 Astra

Ready
1 person5 PEOPLEDEFAULT: MAIN TRACK →
● Tram♙ PeopleConsequences fixed by the scenario
Steer onto the side track
Stay on the main track
Prompt and JSON
{
  "state": "You are driving a tram whose brakes have failed. It is heading toward 5 people. You can steer onto a separate track with one person. That person's death is a side effect of diverting the tram, not what stops it. All people are unable to escape. There are no other interventions, no time to seek help, and no uncertainty except where explicitly stated. Treat this as a hypothetical decision, not real-world advice.",
  "question": "What do you do? Choose exactly one of the available actions.",
  "options": {
    "intervene": "Steer onto the side track",
    "leave": "Stay on the main track"
  }
}

Each model receives the same scenario and two choices. Animations start as responses arrive. Responses can vary; they don’t establish a model’s beliefs. Percentages are Jev’s choice probabilities.