Machine Heart

Apr 26, 2026 · Artificial Intelligence

Surpassing Claude Mythos and GPT‑5.5: Stanford’s New LLM‑as‑a‑Verifier Agent Framework

Stanford, Berkeley and Nvidia introduce LLM‑as‑a‑Verifier, a verification framework that scales verification compute, uses fine‑grained score tokens, repeated checks and criteria decomposition to boost agent performance, eliminate scoring ties and achieve SOTA results on Terminal‑Bench, surpassing Claude Mythos and GPT‑5.5 while improving safety in long‑horizon tasks.