CodexDelver (NetHack AI Ascension)

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CodexDelver (NetHack AI Ascension)

The first recorded NetHack ascension by an autonomous LLM agent.

byKenny

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PlayableOpen source

Description

An autonomous AI agent powered by GPT-6 Astra that successfully completed NetHack, a complex 'grand challenge' roguelike. The agent autonomously built its own software harness to interface with the game terminal, managed its own persistent memory, and successfully navigated over 37,000 game turns to achieve ascension.

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Details

Why this is interesting: Beating NetHack is a landmark 'grand challenge' for AI; this is the first documented LLM ascension.
Attributed to: Kenny@kenforthewin
Built with: GPT-6 Astra
Links: kenforthewin.github.io
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Tags: #nethack #roguelike #autonomous-agent #game-ai

Discovered: X
First posted: X · Sep 25, 2026
Listed: Added 46d ago
Build: Strong
Models: Strong

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