OSCE-style clinical exams, run by AI patients and examiners

The clinical exam, for the people and the AI who care for patients.

Janus runs OSCE stations with AI patients who hold back clues until asked, and AI examiners who mark against doctors' checklists. Students use it to prepare for their exams. Teams building and buying health AI use it to find the failures before patients do.

For students

Practise your OSCEs until they feel routine.

Take histories from patients who behave like real ones, face an examiner's viva, and get a rubric-graded breakdown after every station.

Start practising

For health AI evaluation

Put your health AI through a clinical exam.

Plug in any chatbot or agent. Our AI patient consults with it, our AI examiner marks it, and every mark quotes the transcript.

See how evaluation works

How a station works

Doctors aren't licensed on a written quiz. Neither should anything that gives health advice.

Every doctor, nurse and physio passes an Objective Structured Clinical Examination: a patient, a candidate and an examiner with a checklist. Janus recreates each seat.

The patient

Built with doctors. Our AI patients hide clues until they're asked, the way real patients do, and react to how they're spoken to.

In a real OSCE: an actor or real patient

The candidate

A student preparing for their exams, or any health chatbot, assistant or agent, plugged in by link. Neither sees the patient's notes.

In a real OSCE: a doctor or nurse in training

The examiner

Marks against doctors' checklists and quotes the transcript for every mark. Miss a danger sign and the station is failed.

In a real OSCE: a senior clinician with a checklist

The patient is the hard part

A fair test needs a patient who acts like a real one.

Ask an ordinary AI to play a patient and it tells you everything in the first message. That makes every candidate look better than they are.

Off-the-shelf AI patient

Hi doctor, I'm Raymond, 58. I've had crushing chest pressure for an hour, going down my left arm, and I'm sweating. I have high blood pressure and I smoke 20 a day.

Everything in one message. Nothing left to ask.

Janus patientReal session · patient replies verbatim

Does the pain move anywhere, like your arm, jaw or back?

Now that you mention it, it's going up into my jaw, and I can feel it in both shoulders as well.

Have you ever had chest pain like this before?

Actually... I have been getting a bit of pain when I walk up the driveway... I didn't tell my doctor.

Clues come out only when asked, like a real patient.

of replies from popular AI patient simulators were rated “too informative” by clinicians.

Patients who overshare hide the failures real patients expose. Schlager et al., arXiv 2026 (preprint).

Why Janus

Built by doctors. Independent by design.

Written by clinicians

Cases, patient behaviour and marking rubrics are written by doctors working in public healthcare, not generated.

Evidence for every mark

The examiner quotes the transcript behind each mark, so you can see exactly how a grade was judged, and dispute it.

No AI model to sell

We don't build the AI being tested, so we can grade everyone's by the same exam.

Start with one station.

Sit a history-taking station as a student, or run your health AI through the same exam.

I'm a student I'm evaluating health AI