Chai
By Chai Research
Chai is an AI chatbot platform focused on character-based conversations, letting users create and chat with a wide variety of AI characters built by the platform's own user community, positioning itself as a social, entertainment-oriented…
Definition
Chai is an AI chatbot platform focused on character-based conversations, letting users create and chat with a wide variety of AI characters built by the platform's own user community, positioning itself as a social, entertainment-oriented alternative to general-purpose AI assistants. It has also run public initiatives that use real user engagement to compare different underlying conversational models rather than relying on a single fixed model.
Overview
Chai's defining feature relative to other AI companion or character-chat products is its emphasis on a large, user-generated library of characters rather than a single companion a user configures for themselves. Users can browse and chat with characters created by other members of the community, spanning genres from casual conversation to fandom-based and fictional personas, in addition to being able to create their own characters to publish for others. The platform runs on underlying language models that Chai has, at different points, trained, fine-tuned, or sourced to support open-ended, in-character roleplay-style dialogue, and it has run public model-evaluation initiatives where user engagement signals were used to compare different underlying models for conversational quality. This community-and-competition-driven approach to model selection is somewhat distinct from companion apps that rely on a single fixed model. Chai has drawn attention in discussions about AI safety and content moderation given the scale and openness of its user-generated character library, since a platform allowing broad public character creation has to manage a wide range of content moderation questions — including age-appropriate content, harmful or sensitive roleplay scenarios, and how the platform responds when a conversation touches on topics like self-harm. This has made Chai a frequently cited example in broader debates about the risks of largely open, engagement-driven chatbot platforms, particularly as user bases have skewed toward younger audiences in some markets. Within the AI-companion and character-chat space, Chai's closest comparators are Character.AI (which similarly hosts a large public library of user-created characters) and companion apps like Nomi and Kindroid, which emphasize a single configured companion over a broad public library. Because anyone can publish a character, the practical experience of using Chai depends heavily on browsing and discovery — a user typically searches or scrolls through community-created characters much like browsing a media library, rather than configuring a single companion from a blank slate the way Nomi or Kindroid users do. The engagement-based model comparison initiatives the company has run reflect a philosophy of letting real usage data, rather than a fixed benchmark, determine which underlying language model produces conversations users continue engaging with. This same scale and openness is the source of most outside criticism: a platform that lets any user publish a character to a large audience has a harder content-moderation problem than one where a single company curates every companion's personality, and reporting on Chai has repeatedly focused on gaps between the platform's stated policies and what young or vulnerable users have actually encountered.
Key Features
- Hosts a large library of user-created AI characters to chat with
- Lets users create and publish their own characters for others
- Has run public initiatives comparing underlying conversational models
- Supports open-ended, in-character roleplay-style dialogue
- Available primarily as a mobile chat application
- Emphasizes social and entertainment-oriented use over task assistance