In recent years, leading artificial intelligence labs and startups have released AI software designed for tasks of ever-growing complexity, including solving PhD-level math problems, reasoning through complex questions step-by-step, and using tools like web browsers to carry out intricate tasks.

The role of AI engineers in making that happen is well-documented—and often well-compensated. But less publicized is the role of a growing army of freelance experts, from physicists and mathematicians to photographers and art critics, enlisted by companies specialized in AI training, itself a multibillion-dollar industry. Those companies say human wisdom is essential to create sample problems, solutions, and grading rubrics that help AI improve its performance in a wide range of fields.

“As long

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