Sigma AI

Sigma AI provides training data, independent evaluation and human-in-the-loop review for companies building language models and agents. It draws on a network of more than 70,000 vetted experts covering over 700 languages and dialects, and works with frontier labs and AI start-ups.

Its services sit underneath a client's models and agents: curating and labeling data, running evaluations that catch failures lab benchmarks miss, staffing human review operations and advising on governance. It also offers data-secure training sandboxes.

The company says it has built AI data and evaluation for more than 18 years and has over 30 enterprise clients in production. Engagements are arranged through its sales team rather than a self-serve plan.