AI agents beat Left 4 Dead 2's 5 campaigns in 13.8 hours of play for $12.27

imjustnewatai · x · 2026-09-26

An experiment by imjustnewatai: two AI agents (GPT-6-based "Astra" and "Jev") cleared all 5 campaigns and 23 chapters of Left 4 Dead 2 on Easy with bots, logging at least 13.8 hours of play at a cost of only $12.27 in API spend. Full recordings and code are public. The hardest part was human monitoring: scrubbing recordings to catch loops and confirm successful escapes.

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