Last updated 08-22-2026
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Chai AI
Chai AI lets you create and talk to custom AI characters on mobile, with open-ended roleplay and personality-driven chat instead of factual Q&A. It launched on the App Store in February 2023, before Character AI and ChatGPT had consumer apps, and now serves over one million daily active users with average session times around 90 minutes.
Unlike general-purpose assistants optimized for factual answers, Chai trains hundreds of in-house language models for entertaining, personality-driven conversation. The team uses RLHF, model blending, DPO, and GRPO on user signals rather than textbook correctness, and their proprietary 10x24B blended ensemble reportedly beats GPT-4o on engagement by over 60%.
The company runs its own 1.4 exaflop GPU cluster with about 5,000 NVIDIA and AMD chips serving 1.2 trillion tokens per day across 51,000 unique LLMs. That infrastructure lets them AB test new architectures on live traffic instead of waiting on third-party API limits.
Chai fits mobile users who want open-ended roleplay, creative writing partners, or casual character chat. Browse community-made personalities or build your own from scratch on iOS and Android.
Build custom AI characters and storylines from scratch
Browse community-created personalities to chat with instantly
Runs on in-house LLMs tuned for social engagement, not factual Q&A
1.4 exaflop GPU cluster serves 1.2 trillion tokens per day
Native iOS and Android apps; web client listed as coming soon
Safety filters hide mature content and block specific characters
In-app anonymous reporting flags problematic characters or messages
Among the first consumer character-chat apps on mobile, with over one million daily active users.
Trains and serves its own LLMs on a 1.4 exaflop GPU cluster instead of relying on a single third-party API.
Built-in safety filters, real-time scanning, and anonymous reporting in the app.
No public pricing page; subscription requirements vary by region.
Web client is not available yet despite being listed as coming soon.
Rated 18+ only, so it is not suitable for younger audiences.
Is Chai AI free to use?
Chai AI does not publish plan prices on its website. The Safety Center notes that in some regions the service requires a paid subscription, which suggests a freemium model with regional differences. Download the iOS or Android app to see pricing for your area.
What platforms does Chai AI support?
Chai AI is available on the Apple App Store and Google Play. The company website lists CHAI WEB as coming soon, so browser access is not live yet.
Is Chai AI safe for minors?
No. Chai AI is rated 18+ on both the App Store and Google Play and states it is not intended for minors. Age verification applies in regions where app stores require it.
Can I create my own AI character on Chai?
Yes. Chai AI is built as a consumer platform where users create their own AI characters and stories, not just chat with preset bots. You can also browse characters made by other users.
How does Chai AI handle safety and moderation?
Chai AI scans messages in real time for self-harm content, offers optional safety filters to hide mature material, and lets you report characters or messages anonymously inside the app. Crisis resource notifications appear when self-harm intent is detected.
When did Chai AI launch?
Chai AI launched on the App Store in February 2023. The company says it was among the first consumer AI platforms to let users create their own chat AIs, ahead of Character AI and ChatGPT mobile releases.