Shisa Platform
Enterprise APIs: Translation, TTS, ASR, ShisaLLM
Production-grade translation, TTS, and ASR APIs — purpose-built for Japanese and the languages it lives alongside.
Shisa.AI builds frontier translation, speech, and language models tuned for Japanese. Power your product with APIs trusted by enterprises across Japan.
Voice Input
ASR
LLM / Translate
Agent Reasoning
Speech
TTS
My App
JA
営業利益は前年比15％伸長。
EN
Operating profit up 15% YoY.
Solutions for your Business.
Chotto
Consumer chat app. Intuitive AI for Japan conversational AI
A bilingual AI chat assistant that actually understands Japanese context, nuance, and business etiquette.
Shisa LLM
Open-source models, papers, benchmarks
Our family of open-weight Japanese language models, released so the whole ecosystem can build on Japanese-fluent AI.
Latest from Shisa
Shisa.AI Showcases AI Innovation at DIG Shibuya and Shibuya Creative Tech 2026
We were honored to participate in this landmark event where the worlds of art and technology converge in the heart of Tokyo.
Read moreShisa V2.1 Series Released: Supporting Everything from Devices to the Cloud
Introducing a more efficient and powerful LLM series with significantly improved Japanese performance.
Read moreShisa.AI Develops Multilingual LLM with Industry-Leading Performance
Releasing an open-source 405B parameter model that surpasses GPT-4 in Japanese language tasks.
Read more Case studies
See all case studies Customer stories
50% faster localization
A leading Japanese media group
Leading Japanese media group cuts localization time in half with Shisa Translation API
Replaced a multi-vendor translation memory workflow with Shisa Translation API plus a custom glossary, halving weekly article localization turnaround.
Read the story 3× user engagement
Chotto.chat
Chotto triples user engagement by switching to Japanese-first ShisaLLM
Moving from a general-purpose model to Japan-tuned ShisaLLM drove daily sessions, retention, and paid conversion sharply higher.
Read the storyResearch & open models
Models
Introducing Shisa V2
A fresh Japanese-first open-weight LLM family covering 7B, 13B, and 70B parameter tiers, with honest benchmarks and the training recipes behind them.
Read on blog.shisa.ai ModelsShisa V2 405B: scaling up without leaving Japanese behind
What changed at frontier scale — dataset composition, tokenizer tweaks, and eval lessons from our biggest model yet.
Read on blog.shisa.ai InfraTuning vLLM for AMD MI300X
A pragmatic walkthrough of getting high-throughput Japanese-language serving on MI300X, including the kernel knobs that actually moved the needle.
Read on blog.shisa.aiReady to ship Japanese-fluent AI?
Get an API key, pilot Chotto inside your team, or partner with us on a custom model. We're happy to help you figure out the right fit.