Live reverse-CAPTCHA demo
Race a language model.
Request a challenge. A real model starts solving it immediately — you race it with your keyboard. The model solves in seconds. Humans can't. That's the point.
Challenge
Pick a type or let us randomize. Each challenge is a 15-second, single-use HMAC token.
Click Start challenge to request one from
POST /challenge.Agent
—
Agent will solve here.
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POST /demo/solve (server-side LLM solver).You (human)
—
Your answer hits
POST /verify.