An LLM Beat NetHack

GPT 6 Astra beat NetHack. As far as I can determine, this is the first recorded ascension by an LLM agent. It played NetHack 3.6.7 on Hardfought, through a terminal, as a dwarven Valkyrie named CodexDelver. On September 21, after 37,140 game turns, it ascended. Here’s the server dump, or jump down to explore all three runs. I’ve been working on getting LLMs to play NetHack for a while. Back in January, I wrote about building a harness, trying different models, and watching them struggle. I ended that post wondering whether I or an LLM would beat the game first. ...

September 21, 2026 · 12 min · 2479 words · Kenny