Circle allows anyone to create virtual AI-powered NPC characters, with any personality and backstory they want. Each Circle chatbot comes equipped with long-term memory, powered by Operand.

For each conversation between a user and a chatbot, Circle creates a corresponding Operand index, which stores the messages sent to and from the chatbot.

When the user sends a message to the chatbot, Circle first does a search to find relevant messages from the conversation history. Circle then uses these messages to augment the GPT-3 prompt, to help the chatbot remember the conversation history.