CAPTCHA

Benchmarking Bot Detection Systems Against Modern AI Agents in 2026

Proof of Human researchers revisit their bot detection benchmark, testing Proof of Human, Google reCAPTCHA v3, hCaptcha, Cloudflare Turnstile and Cloudflare Bot Management against scripted browsers, stealth browsers and AI browsing agents completing a five-question survey. Detection rates ranged from 9% to 99%; they discuss where each system failed, limitations, and why behavioural signals matter more.

Research · Bot Detection · AI Agents · Security · CAPTCHA