Character.ai: The Technical Story of What Keeps Users Hooked
SMRTR summary
Character.ai keeps millions of users hooked through a combination of custom AI models, smart memory systems, and speed tricks. Their in-house model family, Kaiju, was built specifically for long role-play and companion chats — not just answering questions. Features like Story Memory, Facts, and Lorebook keep conversations consistent over many turns, while serving techniques like shared KV caches and INT8 processing deliver fast replies that preserve immersion.
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