Open-weight model GLM 5.3 built full Firefox exploit chains with zero human input in under 48 hours.

Epoch AI researchers say the open-weight model GLM 5.3 turned public security fixes into working exploits against Firefox before updates reached users, autonomously compromising six Firefox releases at roughly $1,000 in API fees each.

Why it matters: It indicates a widely available open-weight model can generate working exploit chains without human input, at low cost, before patches reach users.

Written by AI from The Decoder's published text.