Proprietary AI ModelsBuilt for Production
We build state-of-the-art AI models . Best-in-class embeddings, powerful LLMs, and specialized Legal AI—all developed in-house by our world-class research team.
Proprietary models · Trained · Production-ready APIs
AI Models Built from Scratch
We train proprietary models from the ground up, optimized for real-world applications.
Lesai Embeddings
State-of-the-art multilingual embeddings. Outperforms OpenAI and Cohere on MTEB benchmarks. Perfect for RAG, search, and classification.
Lesai LLM
LLM for administrative and legal workflows. Built for management, government, HR, legal teams, and more.
LLM PowerUp
Extend any model's context to 85M+ tokens. Enterprise SDK extension compatible with Vercel AI SDK, LangChain, and more.
Legal AI
Purpose-built models for Latin American legal systems. Trained on millions of legal documents for contract analysis and research.
Research Lab
Where the magic happens. Our team publishes cutting-edge research and builds the models that power everything we do.
Embeddings & LLMs
Best-in-class proprietary models, built . Our embeddings outperform OpenAI ada-002 and Cohere on major benchmarks. Simple API, blazing fast inference.
Lesai Legal
Multilingual LegalProprietary multilingual legal model for LATAM jurisdictions. Spanish, Portuguese, English.
Lesai Legal Fast
Low LatencyOptimized for real-time legal document analysis and conversational applications.
Lesai Embed
EmbeddingsMultilingual embeddings optimized for legal documents and semantic search.
Simple, transparent pricing. Start free. Scale as you grow. No hidden fees.
Start BuildingLegal AI That Actually Works
We trained our models on millions of Latin American legal documents. Not a wrapper around GPT—a purpose-built system that understands LATAM law.
Contract Analysis
Instant risk assessment and clause extraction. Trained on 500K+ LATAM contracts.
Legal Research
Search millions of precedents and regulations. Semantic search powered by Lesai Embeddings.
Compliance Check
Automated compliance verification against local regulations and requirements.
Document Generation
Generate jurisdiction-specific legal documents in seconds.
Available Countries
Live in Ecuador and El Salvador
We Train Models from Scratch
Our research team builds state-of-the-art embeddings and LLMs. We publish our findings, open-source our tools, and push the boundaries of what's possible.
Lesai Legal: A Multilingual Foundation Model for Latin American Legal Systems
Lesai Group Investigation Los Angeles
We introduce Lesai Legal, a family of proprietary multilingual foundation models specifically designed for legal applications in Latin American jurisdictions. Our models achieve state-of-the-art performance on Spanish, Portuguese, and English legal benchmarks while maintaining strong capabilities across all three languages. We present comprehensive evaluations on legal document analysis, contract review, and regulatory compliance tasks.
What We're Building
Multilingual Embeddings
State-of-the-art embedding models supporting 100+ languages.
Legal Document Processing
Efficient architectures for processing extensive legal documents and contracts.
Domain-Specific Models
Specialized models for legal, finance, and healthcare. Trained on curated domain data.
Efficient Inference
Quantization, speculative decoding, and custom kernels for sub-20ms latency.
Our Models
Multilingual legal domain model
Multilingual legal embeddings
Built for Scale
Simple APIs, global edge network, and enterprise-grade reliability. From prototype to production in minutes.
Global Edge Network
USA
Primary
Brazil
< 10ms
Mexico
< 15ms
Colombia
Coming
99.99% Uptime
Enterprise SLA
SOC 2 Type II
Security certified
Simple Pricing
Pay per token
Auto Scaling
Infinite scale
Instant Setup
One API key
Data Privacy
Your data, your control
Transparent pricing. No surprises. Start free with 1M tokens. Scale with simple, predictable pricing.
Ready to ship with the best embeddings?
Join thousands of developers building with Lesai. Get started in minutes with our simple API.
Free tier available · No credit card required · SOC 2 certified