Japan's Highest Performing LLM

Shisa LLM API

Access Japan's most advanced bilingual AI models through a simple OpenAI-compatible API. Built from the ground up for Japanese language excellence while maintaining strong English capabilities.

Choose Your Model

Three powerful models optimized for different use cases - from efficient edge deployment to maximum capability

Efficient
Shisa V2.1 14B
Compact yet powerful - surpasses larger models in Japanese tasks with exceptional efficiency
  • 16K context window
  • Outperforms V2 70B in Japanese
  • Fast inference, lower cost
shisa-ai/shisa-v2.1-unphi4-14b
Recommended
Powerful
Shisa V2.1 70B
Our recommended model - optimal balance of capability and performance for production use
  • 65K context window
  • 9.26 Japanese MT-Bench score
  • Approaching 405B performance
shisa-ai/shisa-v2.1-llama3.3-70b
State of the Art
Shisa V2 405B
Japan's highest performing LLM - outperforms GPT-4 and rivals GPT-4o in Japanese benchmarks
  • 131K context window
  • Outperforms GPT-4 Turbo
  • CJK multilingual (JP/EN/KO/ZH)
Available via pre-approved whitelist only
Contact us for access

Built for Japanese Excellence

Purpose-built models that understand Japanese language, culture, and nuance better than generic alternatives

Japanese Language Expertise
Trained on proprietary Japanese datasets with 80%+ new data in V2.1. Understands keigo, dialects, and cultural nuances.
Bilingual Proficiency
Seamlessly switch between Japanese and English in the same conversation. Perfect for translation and cross-cultural communication.
OpenAI-Compatible API
Drop-in replacement for OpenAI SDK. Use existing code with just a base URL change - no migration effort required.
Real-time Streaming
Full streaming support for responsive applications. Get tokens as they're generated for the best user experience.
Japan-Hosted Infrastructure
Low latency for Japan-based applications. Data residency compliance for Japanese enterprise requirements.
Reduced Token Leakage
Up to 47.8x reduction in unwanted non-Japanese tokens compared to base models. Clean, natural Japanese output.

Industry-Leading Performance

Validated against rigorous benchmarks including proprietary Japanese-specific evaluations

9.26
Japanese MT-Bench
(V2.1 70B)
73.1%
Japanese AVG Score
(V2.1 70B)
80.5%
Japanese AVG Score
(V2 405B)
47.8x
Token Leakage
Reduction

Shisa V2 405B is the highest-performing LLM ever trained in Japan, outperforming GPT-4 (0603) and GPT-4 Turbo (2024-04-09) in Japanese benchmarks.

Simple Integration

OpenAI-compatible API means you can start in minutes with familiar tools and SDKs

Quick Start with cURL
curl -XPOST https://api.shisa.ai/openai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "shisa-ai/shisa-v2.1-llama3.3-70b",
    "stream": true,
    "messages": [
      {
        "role": "system",
        "content": "You are a helpful assistant fluent in Japanese and English."
      },
      {
        "role": "user",
        "content": "日本の四季について教えてください。"
      }
    ],
    "temperature": 0.7
  }'
Python with OpenAI SDK
from openai import OpenAI

# Initialize client with Shisa AI endpoint
client = OpenAI(
    base_url="https://api.shisa.ai/openai/v1",
    api_key="YOUR_API_KEY"
)

def chat_with_shisa(message, model="shisa-ai/shisa-v2.1-llama3.3-70b"):
    response = client.chat.completions.create(
        model=model,
        messages=[
            {"role": "system", "content": "You are a helpful assistant."},
            {"role": "user", "content": message}
        ],
        stream=True,
        temperature=0.7
    )

    for chunk in response:
        if chunk.choices[0].delta.content:
            print(chunk.choices[0].delta.content, end="", flush=True)

# Example usage
chat_with_shisa("東京でおすすめの観光スポットを教えてください。")
JavaScript/TypeScript
import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://api.shisa.ai/openai/v1',
  apiKey: 'YOUR_API_KEY',
});

async function chatWithShisa(message) {
  const stream = await client.chat.completions.create({
    model: 'shisa-ai/shisa-v2.1-llama3.3-70b',
    messages: [
      { role: 'system', content: 'You are a helpful assistant.' },
      { role: 'user', content: message }
    ],
    stream: true,
    temperature: 0.7,
  });

  for await (const chunk of stream) {
    const content = chunk.choices[0]?.delta?.content || '';
    process.stdout.write(content);
  }
}

// Example usage
await chatWithShisa('日本語で自己紹介をしてください。');

Trusted Use Cases

See how businesses leverage Shisa LLM for Japanese AI applications

Translation & Localization
High-quality Japanese-English translation that understands context, formality levels, and cultural nuances.
  • Document translation
  • Real-time chat translation
  • Website localization
  • Marketing content adaptation
Customer Service Chatbots
Build conversational AI that speaks natural Japanese with proper keigo and cultural sensitivity.
  • Customer support automation
  • FAQ answering systems
  • Appointment booking
  • Product recommendations
Content Generation
Generate high-quality Japanese content that reads naturally and engages Japanese audiences.
  • Blog posts & articles
  • Product descriptions
  • Email drafting
  • Social media content
Get Started Today

Ready to Build with Japan's Best LLM?

Contact us for API access and start building with Shisa LLM. Enterprise plans available with dedicated support.