Why Do AI Models Tell Left-Wing Voters to Support the Communist Party?

Researchers conducted an experiment during Japan's February 2026 election and found that five major AI chatbots overwhelmingly recommended the Japanese Communist Party to voters with left-leaning policy positions. The bias appears to stem from the information sources these AI models can access rather than their training data, raising concerns about AI political neutrality in non-U.S. contexts as voters increasingly rely on chatbots for voting guidance.