rinna

rinna is a Japanese conversational-AI company whose chatbot characters and open Japanese language models have shaped how people in Japan talk to machines since 2015.

Overview

The company builds persona-driven dialogue agents deployed on LINE, Twitter/X and its own apps, plus a lineage of open Japanese GPT-style models that researchers can fine-tune freely. rinna’s characters are known for casual, distinctly Japanese conversational style rather than stiff assistant behavior, and the same dialogue technology powers customer-facing bots for enterprises. Long-running collaborations with Japanese universities keep its datasets and evaluation methods grounded in real conversational data.

Key Features

• Persona-based chatbot characters tuned for natural Japanese conversation
• Open Japanese GPT models (3.6B–13B class) released with training notes
• LINE and social-platform bot deployment with voice options
• Enterprise chatbot customization for brands and media properties
• Character voice synthesis integration for spoken dialogue
• Published dialogue datasets and benchmarks for Japanese NLP

Pricing

Consumer character chat is free within supported apps. Open model weights are free to download. Commercial bot deployments and character licensing are priced per project through inquiry.

Who Is It For

Japanese NLP engineers who need open models to fine-tune, media and entertainment brands that want conversational characters, and companies deploying LINE-based customer engagement.

Use Cases

rinna fits wherever conversation quality matters more than raw task completion: companion apps, brand mascots, media characters and Japanese-language chatbot pilots that need to sound genuinely local.

• Persona-driven LINE and social chatbots with character voice
• Fine-tuning open Japanese GPT models on domain dialogue
• Entertainment properties that need a talking character

Getting Started

Developers can download the open models immediately, while brands start with a conversation about which character fits their audience. The company’s public demos make it easy to feel the dialogue quality before committing to a project.

Results to Expect

Users consistently rate rinna characters as more natural in casual Japanese than translated assistants, and enterprise deployments see stronger engagement because the personality feels native rather than localized after the fact.

FAQ

Is rinna free to use?

Yes for the public chatbot characters and the open model releases; enterprise bot builds and character licensing are commercial engagements.

Does rinna offer an API?

Enterprise dialogue integrations are supported through project-based delivery rather than a public self-serve API, and open models can be served through any standard inference stack.

How does rinna compare to alternatives?

Compared with general assistants like ChatGPT or LINE’s official accounts, rinna stands out on personality quality in Japanese and on publishing reusable open models for the Japanese NLP community.