On September 3, 2026, Google Research and the Janelia Research Campus of the Howard Hughes Medical Institute published the MaleCNS v1.0 dataset. This public resource provides a complete connectome of an adult male fruit fly, mapping 166,000 neurons and approximately 125 million synaptic connections across the brain, optic lobes, and ventral nerve cord.
This release surpasses a 2024 mapping of a female fruit fly brain, which contained 139,000 neurons. The new dataset represents the most comprehensive wiring diagram of an adult animal central nervous system ever made public, allowing developers to simulate biological connectivity directly rather than relying on traditional artificial neural networks.
Independent developers have utilized the simulation to pilot robots, play chess, and trade cryptocurrency. In one experiment, the fly's neural firing thresholds were linked to a Coinbase interface to execute trades, resulting in a profit of exactly $1. Chess experiments involved mapping visual board states to motor output signals, though claims of victories against top-tier engines remain unverified.
While the experiments demonstrate that biological wiring can generate responses to structured inputs without prior training, researchers note that neural firing thresholds are not optimized for probabilistic financial reasoning. The project highlights a shift toward simulating biological systems as an alternative approach to machine intelligence.
