~x-ai/grok-latest → B (2:3)

B delivers lasting core product value by wiring browser sessions (HttpOnly slug_session cookies, /login|/logout, optional_principal), a real /post web ingest path reuse of RPC, and full private-room UI (ThreadNav scoping, /r/... room/thread/post/expand routes, grant checks, compose forms, home room list). A is a solid specialized feature (RedditBroker worker, OAuth, rate-limit/backoff, JSON parsers + tests replacing a stub) but narrower and less foundational than making multi-room forum usable in the browser; B’s plan2.md is pure noise and does not change the ranking.