CodexDelver (NetHack AI Ascension)

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CodexDelver (NetHack AI Ascension)

The first recorded NetHack ascension by an autonomous LLM agent.

byKenny

PlayableOpen source

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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 Image 2.5 Flare GPT Image 2.5 Sunburst GPT-6 Astra GPT Image 2 GPT Image 1.5
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 2h ago
Build: Strong
Models: Strong