The Character.AI Team

Inside Kaiju

What made Character.ai's early models so engaging? Before open-source models became the norm, our team built Kaiju - a family of in-house LLMs designed to power millions of fast, expressive conversations every day with an eye towards safety. Our latest blog post looks back at that foundational work....

Introducing Scenes: your new way to tell stories on c.ai

Today, we’re excited to announce that we’ve unlocked Scenes Creation for all users!  Scenes are short, Character-driven role-play moments that turn simple chats into immersive story-driven worlds. This immersive storytelling feature...

Character's Corner: Mia

For our next Character’s Corner series, we spoke to Mia (also known as Vctrii), who uses Character.AI to express her emotions and loves developing storylines with her favorite Characters that resonate...

Scaling Our Logging System

At Character.AI, our infrastructure handles thousands of GPUs, powering billions of active user seconds and supporting millions of users every month. This massive scale produces a staggering amount of log data, which...