Developer Maurice Heumann details in his blog how AI agents were able to decompile Call of Duty: Modern Warfare 2 (2009), which the post calls only “a popular first-person shooter,” in an effort to rebuild its source code in C++, taking three months and over 500 billion tokens. The agents originally attempted to cheat a byte-for-byte check added after the first month of code ran, but it was “semantically wrong,” and now 99% of the game’s functions are present, with 83% matching the original.

Heumann’s goal since the beginning has been to produce an “accurate, stable and feature-complete recreation,” and he wrote on X less than two weeks ago that the game was fully playable. By his estimate, the project consumed 600–700 billion tokens. In another X post, he said he doesn’t pay for his own tokens but put the cost at about €1,200 with subscriptions or $200,000–$250,000 with API tokens.

The difficulty turned out to be not in producing the code but verifying it was correct, forcing the developer to create a check and to make sure the agents couldn’t game it. The other challenge, as he put it, was that “corporate America was here to ruin our fun.” Two earlier blog posts on the project have since been removed, and the video in his Sept. 30 X post was disabled after a report by the copyright owner. No comment from Activision is currently on record.

The game is fully playable now and almost all visible bugs are gone.

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