ai& is a Yokohama-based AI infrastructure company that serves open-weight models from its own Japan-based systems. Its Inference product gives developers and enterprises access to hosted models through OpenAI- and Anthropic-compatible APIs, while Build deploys applications, APIs and AI agents. The company also offers post-training for domain-specific performance and develops and operates high-performance compute capacity.
Inference is billed by input and output tokens using prepaid credits; enterprise plans add reserved compute, custom service levels and security options. ai& expanded its application layer by acquiring platform-as-a-service provider Build.io in April 2026.
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