Scale AI

Scale AI, Inc. is an American artificial intelligence infrastructure and software company based in San Francisco, California. Originally focused on data annotation, the company also offers RLHF services, large language model (LLM) evaluation, and enterprise software suites to build and deploy AI applications.

The company’s research arm, the Safety, Evaluation and Alignment Lab, focuses on evaluating and aligning LLMs. It also co-created the benchmark Humanity's Last Exam. Scale AI outsources data labeling through its subsidiaries, Remotasks, which focuses on computer vision and autonomous vehicles, and Outlier, which focuses on data annotation for LLMs.

Scale AI operates a dedicated LLM Red Team that conducts human adversarial testing to identify vulnerabilities, biases, and safety risks in AI models. The team has partnered with frontier AI developers like OpenAI, Google DeepMind and national AI Safety Institutes to evaluate systems against complex threats, including cybersecurity vulnerabilities, jailbreaks, and agentic AI behaviors.

Scale AI's customers in the commercial sector have included Google, Microsoft, Meta, General Motors, OpenAI, and Time. The company also directly works with world governments, including the United States on multiple military-related projects, and with Qatar to improve the efficiency of its social programs.

In June 2025, Meta Platforms invested over $14 billion into Scale AI to acquire a 49% stake. CEO Alexandr Wang left Scale AI to join Meta and was replaced by Jason Droege.