Drive LLM training to build omnipotent LLMs that deliver results!
Optimize post-training LLMs with high-quality datasets, helping enterprises and AI teams build multilingual and domain-specific models.
Trusted by Industry Leaders Worldwide





















Our Capabilities
Provide various LLM training solutions for customized models.
Supervised Fine-Tuning (SFT)
Human Preference Ranking (RLHF/DPO)
LLM Evaluation & A/B Testing
LLM Red Teaming
LTS GDS provides fine-tuned datasets to enhance LLM capabilities across different use cases and specialized domains such as coding, customer support, healthcare, finance, and more.
Several tasks we focus on:
- Prompt generation and verification
- Answer generation and evaluation
- Dialogue generation and evaluation
- Context adaptation for domain-specific tasks
- Error detection and refinement suggestions

Our experts evaluate model-generated responses in different contexts using reinforcement learning with human feedback (RLHF) and Direct Preference Optimization (DPO), based on quality criteria such as logic, accuracy, semantics, and ethical behavior.
Key features:
- Real-time human interactions to guide model behavior
- Evaluation of single- or multi-turn conversations
- Customizable evaluation criteria: semantic accuracy, clarity, tone, and compliance

LTS GDS offers structured evaluation services to benchmark LLM performance through A/B testing, comparing different model versions, or measuring against industry benchmarks.
Key capabilities include:
- Detailed comparisons between LLM versions
- Evaluation based on correctness, coherence, safety, and relevance
- Support for both qualitative and quantitative analysis in real use cases

LTS GDS identifies potential weaknesses in LLMs to ensure safe and reliable deployment. Our red teaming process detects vulnerabilities like bias, hallucinations, and unsafe outputs.
Use cases include:
- Detecting and preventing harmful or biased responses
- Identifying hallucinations and factual inaccuracies
- Testing for security risks, including malicious or inappropriate suggestions
- Multi-turn adversarial testing using real scenarios

Our 500+ AI Trainers Pool
Train LLMs with deep industry expertise, powered by multilingual, multi-level experts.

Phung Thanh Xuan

English

Russian

Mandarin Chinese

Cantonese

Japanese

Korean

Malay

Indonesian

Thai

Lao

Hindi

Arabic

French

German

Spanish

Portuguese

Italian

Bulgarian

Hungarian

Engineering

Civil Engineering

Law

Finance

Accounting

Economics

Mathematics

Computer Science

Medicine

Psychology

Physics

Healthcare

Chemistry

Biology

Astronomy

Biotechnology

Bioinformatics

Teaching

Linguistics

Religion

Language Arts

Music

Philosophy

History

Performing Arts

Robotics Engineers

Computer Scientists

Software Engineers

Systems Architects

Data Engineers

AI/ML Researchers

Financial Analysts

Accountants

Auditors

Economists

Investment Bankers

Risk Managers

Psychologists

Sociologists

Political Scientists

Administrators

Scientists

Mathematicians

Photographers

Screenwriters

VFX Supervisors

Cinematographers

Art Directors

Creative Directors

Animation Directors

3D Modelers

Sound Designers

Audio Engineers

Music Composers

Voice Directors
How to Train an LLM at LTS GDS
Train an LLM by combining large-scale pre-training, expert-guided post-training, and domain-specific fine-tuning for industry-ready performance.

Our LLM Training Services Workflow
Follow a structured LLM training method to achieve excellent outcomes.

A dedicated project manager works closely with the client to understand business objectives, data sources, and LLM training needs. We assess model scope, domain requirements, training methods, compliance considerations, expected outcomes, and cost factors. Based on this, we propose a customized LLM training strategy to ensure alignment before project initiation.

LTS GDS will assemble a dedicated delivery team, including both internal experts and vendor partners from different regions worldwide when needed. Training sessions are conducted to align all team members on project goals, annotation or data preparation standards, and execution methodology. This ensures every contributor understands the LLM training workflow from day one.

Before scaling, our team executes trial tasks to validate the process. Outputs are shared with the client for review, and feedback is integrated into updated guidelines. This step helps refine edge cases, improve consistency, and ensure the LLM training process matches business objectives.

LTS GDS manages large-scale LLM training and fine-tuning with strict deadlines and regular quality checks. Specialized teams handle different tasks, while ongoing meetings ensure the training process adapts to client feedback. Together with our clients, LTS GDS defines clear evaluation criteria to measure output quality and refine results until they meet expectations.

We proactively track and report issues, such as unclear requirements or hidden scenarios, to the client. Our internal team meets regularly to resolve errors, update workflows, and strengthen the LLM training outcomes over time.
Why LTS GDS?
Partnering with us makes LLM development more productive.

Quality-first Approach
We deliver reliable LLM training outcomes with high accuracy. Our multi-layered review process ensures that models are refined with critical thinking and contextual understanding.

Domain-Specific Expertise
Our AI trainers bring deep knowledge across industries to create domain-specific LLMs that understand specialized terminology and meet real model needs.

Global Competence
With huge teams in many regional markets and cultures, our experts train LLMs that adapt naturally to multilingual use cases and cultural nuances.

Cost-effective
Leverage Vietnam’s competitive labor costs, favorable business environment, and flexible pricing models to optimize your LLM projects.
Wall of Achievement
50M+
Data Units
50+
Languages
11
Countries
200+
Projects
Our Case Studies
See how enterprises have leveraged our LLM training services to scale AI adoption.
Our Tools and Technologies
Use cutting-edge tools and frameworks to elevate the LLM training process.














FAQs about LLM training services
How does LLM training work?
Training an LLM typically happens in two main stages. First, the model undergoes pre-training on massive datasets from diverse sources to learn general language patterns. Next comes post-training, where we adapt the model with high-quality, domain-specific data, applying techniques such as SFT (Supervised Fine-tuning), RLHF (Reinforcement Learning with Human Feedback), Evaluation, and red-teaming to ensure the model meets accuracy, safety, and business-specific requirements.
What is the difference between SFT and RLHF?
SFT is a training process that using domain-specific, labeled datasets to fine-tuning a pre-trained Large Language Model (LLM) to help the model learn task-specific behavior. Meanwhile, the RLHF method means ranking and refining the model’s responses based on human judgments of quality, safety, and usefulness, making outputs more aligned with human expectations.
What is the difference between LLM training and RAG?
RAG (Retrieval-Augmented Generation) connects and retrieves knowledge base outside of its training data sources to answer a user's question. RAG is excellent for adding new knowledge to an LLM, but it doesn't change the model's core behavior. LLM training changes the model's fundamental behavior, tone, and ability to follow specific instructions. Depending on the specific project, we will apply RAG or LLM training to achieve the best result.
How much training data is required to train an LLM effectively?
The needed volume varies by use case. General foundation models may require billions of tokens, while domain-specialized or fine-tuned models can succeed with much smaller, high-quality datasets. LTS GDS specializes in offering high-quality datasets for the post-training process (SFT, RLHF, etc.)
What data sources do you use to train LLMs?
During the pre-training stage, LLMs are trained on large-scale datasets collected from diverse sources. For post-training and building domain-specific LLMs, the focus shifts to quality, expertise, and project-specific requirements. We leverage client-provided materials, licensed proprietary databases, and data curated by experienced subject matter experts to ensure precision and relevance.
Can LTS GDS offer data labeling for multilingual or multimodal LLMs?
Yes, we train and fine-tune multilingual LLMs across 50+ languages and multimodal (vision-language/audio) models when required, preserving cultural nuance and regional context for better user experience.
How do you address bias and ethical issues in training data?
We begin by clearly defining project requirements and embedding safeguards to prevent bias while adhering to strict ethical standards. Our diverse team of global experts enhances data diversity while updating guidelines to help identify and mitigate bias, stereotypes, toxic content, and discrimination. All will allow the LLMs to remain fair, safe, and reliable.
How do you make sure LLM training aligns with safe and ethical AI principles?
We follow industry best practices and global standards, including transparency in data processing, GDPR and ISO compliance, secure pipelines, and human-in-the-loop models, making them not only powerful but also trustworthy and responsible.
Awards & Certifications










Ready to Build Your Next Generation of LLMs?
Contact us for tailored LLM training solutions from our experts.
