stealth/crouton-alpha is listed at $0 on OpenRouter and the Kilo gateway (expiration_date null), and crouton-alpha-free is listed at $0 in the Zen catalogue; stealth model released 2026-11-03
$0 · no account":free" models answered in the Kilo CLI without signing in (our test, Oct 6); other models need a Kilo account; non-":free" models answer 401 without sign-in (PAID_MODEL_AUTH_REQUIRED, seen 2026-10-16)