Scale AI

Scale AI occupies a unique position in the AI infrastructure stack. While most AI tools are about using AI, Scale AI's primary business is creating the high-quality labelled training data that AI models need to perform well. The company has become one of the primary data labelling and evaluation partners for the leading AI companies including OpenAI, Anthropic, and Meta.

The core service is data annotation at scale. Scale employs and manages a large workforce of data labellers who can annotate text, images, video, audio, and other data types according to precise specifications. For AI companies that need millions of high-quality labelled examples to train their next model, Scale AI provides the human annotation pipeline with quality control processes that ensure consistency and accuracy.

Beyond raw labelling, Scale AI provides AI model evaluation services. Testing an AI model's capabilities, safety, and accuracy requires careful human evaluation of model outputs, and Scale AI's evaluation services are used by major AI labs to assess model performance before deployment.

Scale's enterprise platform, Spellbook, provides tools for enterprises to manage their own AI data workflows, fine-tune models on proprietary data, and evaluate AI system performance.

Scale Donovan, the government and defence division, provides AI capabilities and data services to government agencies and defence contractors, operating under appropriate security clearances and compliance frameworks.

For most individual developers and small businesses, Scale AI is not directly relevant — it is enterprise infrastructure for large organisations with substantial AI development programs. The platform is most relevant to AI product teams at technology companies, large enterprises fine-tuning models for specific use cases, and government agencies.