// challenge
what is recaptcha v2?
a captcha-widget challenge; used by google; mints the g-recaptcha-response token; escalation: checkbox passes silently (low risk read) → image grid challenge (suspicious read) → harder / repeated grids on continued suspicion. image-grid; binary pass/fail on the i'm-not-a-robot checkbox escalating to a grid.
source capture undated
in the benchmark
recaptcha v2 is tracked as part of the challenge taxonomy. see how tracked tools score against it on the capability matrix.