AI Reports · Epoch AI · 2026-10-16 · Survey / index / data
Open-weight AI models are 6-7 months behind on cyber
Z.ai's GLM-5.3 is the top open-weight model on Epoch's Cyber ECI, with a score of 160. That score is above OpenAI's GPT-5.4 (released March 2026) but still trails Claude Mythos Preview and GPT-5.5 (both April 2026). Epoch estimates the open cyber frontier roughly where the closed frontier stood 6–7 months ago.