Upstage - Syn
Last Updated on: Nov 18, 2025
Upstage - Syn
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What is Upstage - Syn?
Syn is a next-generation Japanese Large Language Model (LLM) collaboratively developed by Upstage and Karakuri Inc., designed specifically for enterprise use in Japan. With fewer than 14 billion parameters, Syn delivers top-tier AI accuracy, safety, and business alignment, outperforming competitors in Japanese on leading benchmarks like the Nejumi Leaderboard. Built on Upstage’s Solar Mini architecture, Syn balances cost efficiency and performance, offering rapid deployment, fine-tuned reliability, and flexible application across industries such as finance, legal, manufacturing, and healthcare.
Who can use Upstage - Syn & how?
Who Can Use It?
  • Japanese Enterprises: Deploy enterprise-grade generative AI optimized for business processes and local language needs.
  • Industry Solution Developers: Customize the model for finance, legal, healthcare, and manufacturing workflows.
  • Strategic IT & AI Teams: Achieve cost-effective, secure AI with top accuracy and business-relevant outputs.
  • Global Firms Expanding to Japan: Integrate a high-performance Japanese LLM with proven architecture and support.
  • R&D and Innovation Labs: Foster new, industry-specific AI use cases with flexible fine-tuning and best practices.

How to Use Syn?
  • Deploy via AWS Marketplace: Launch secure, enterprise-grade applications tailored to business needs.
  • Customize with Industry Data: Rapidly fine-tune Syn for unique sector or workflow requirements.
  • Integrate into Existing Systems: Use straightforward APIs and deployment options for seamless adoption.
  • Scale with Enterprise Support: Benefit from Upstage’s and Karakuri’s proven implementation, consulting, and ongoing updates.
What's so unique or special about Upstage - Syn?
  • Designed for Japanese Enterprise: High alignment with local language, regulations, and business process needs.
  • Best-in-Class Accuracy & Safety: Top-ranked under 14B models on Nejumi with superior reliability for real business usage.
  • Cost-Optimized Performance: Delivers enterprise results with significantly lower infrastructure and training costs.
  • Fast, Flexible Fine-Tuning: Rapid customization and adaptation for industry-specific requirements.
  • Secure, Enterprise-Level Deployment: Meets strict security standards, available on AWS Marketplace, and designed for flexible integration.
Things We Like
  • Outstanding accuracy and natural Japanese output for real business tasks.
  • Lightweight, efficient architecture based on proven Solar Mini model.
  • Flexible deployment with cost, speed, and security advantages.
  • Designed for industry-specific fine-tuning and rapid adoption.
Things We Don't Like
  • Primarily focused on Japanese language and enterprise—less suitable for general-purpose or global LLM use.
  • Requires careful customization for the most effective sector applications.
  • Some advanced features and deployments may only be available through AWS or enterprise channels.
  • Documentation and community outside Japan may be more limited.
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Pricing
Paid

Developers

Custom

Pay-as-you-go
Public models (See detailed pricing)
REST API
Public cloud
Help center

Enterprise

Custom

One-time installation + Subscription fee
All public models
Custom LLM and RAG
Custom key information extraction
Custom document classification
REST API
Custom integrations
Serverless (API)
Private cloud
On-premises
Upstage Fine-tuning Studio
Upstage Labeling Studio
Personal information masking
Usage and resource monitoring
SSO
24/7 priority support
99% uptime SLA
Dedicated success manager
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FAQs

Syn is a Japanese enterprise-grade LLM, jointly developed by Upstage and Karakuri, optimized for high accuracy, safety, and flexible deployment.
It ranks top on the Nejumi Leaderboard for Japanese models under 14B parameters.
Japanese enterprises, solution developers, and teams needing customized, business-aligned AI.
Syn is available on AWS Marketplace for secure and scalable integration.
Superior Japanese language skills, cost-optimized training, and industry-specific customization options.

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