Registration

Register for the 2026 Open.

Registration is open. The competition is free, online, and open to eligible pre-university students anywhere in the world.

Current status

Registration is open.

Your confirmation email includes a registration ID beginning with CO26. Keep it safe: your registration ID is also your contest-day access code.

Competition: November 14–15, 2026
Registration opens: September 12, 2026
Registration closes: November 13 at 12:00 UTC
Format: 20 problems · 90 minutes · online
Entry fee: Free

Participant details

Register in under a minute.

We collect only what is needed to run the competition, publish results with your permission, and send your contest access code.

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Coordinator code

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