The Caltech Mathathon is an AI-assisted mathematics hackathon running October 30 - November 1, 2026. It drew criticism from 1000+ mathematicians over concerns about AI-generated mathematics, verification burdens, and AI companies benefiting from the event. The organizers subsequently revised the format. OpenAI has withdrawn its sponsorship, while Anthropic remains involved and is still listed on the official website.

The market resolves:

YES: Anthropic publicly announces, or the organizers confirm, that Anthropic has withdrawn its sponsorship/support before the Mathathon ends on November 1, 2026.

NO: The Mathathon ends on November 1 without Anthropic having withdrawn its sponsorship/support.

Official website: https://mathathonchallenge.com/