An API (application programming interface) is the channel through which two pieces of software communicate. In AI, it is the standard way to access models: the application sends a request (the prompt and its context), the provider returns the answer. It is also through APIs that AI agents act on business tools: CRMs, calendars, databases.
In practice at Gensai
Gensai connects models to its clients' systems through APIs, with standardised MCP-style connectors where possible.