🇹🇭 Chinda Opensource Thai LLM 4B

Latest Model, Think in Thai, Answer in Thai, Built by Thai Startup

Chinda Opensource Thai LLM 4B is iApp Technology's cutting-edge Thai language model that brings advanced thinking capabilities to the Thai AI ecosystem. Built on the latest Qwen3-4B architecture, Chinda represents our commitment to developing sovereign AI solutions for Thailand.

🚀 Quick Links

🌐 Demo: https://chindax.iapp.co.th (Choose ChindaLLM 4b)
📦 Model Download: https://huggingface.co/iapp/chinda-qwen3-4b
🐋 Ollama: https://ollama.com/iapp/chinda-qwen3-4b
🏠 Homepage: https://iapp.co.th/products/chinda-opensource-llm
📄 License: Apache 2.0

✨ Key Features

🆓 0. Free and Opensource for Everyone

Chinda LLM 4B is completely free and open-source, enabling developers, researchers, and businesses to build Thai AI applications without restrictions.

🧠 1. Advanced Thinking Model

Highest score among Thai LLMs in 4B category
Seamless switching between thinking and non-thinking modes
Superior reasoning capabilities for complex problems
Can be turned off for efficient general-purpose dialogue

🇹🇭 2. Exceptional Thai Language Accuracy

98.4% accuracy in outputting Thai language
Prevents unwanted Chinese and foreign language outputs
Specifically fine-tuned for Thai linguistic patterns

🆕 3. Latest Architecture

Based on the cutting-edge Qwen3-4B model
Incorporates the latest advancements in language modeling
Optimized for both performance and efficiency

📜 4. Apache 2.0 License

Commercial use permitted
Modification and distribution allowed
No restrictions on private use

📊 Benchmark Results

Chinda LLM 4B demonstrates superior performance compared to other Thai language models in its category:

Benchmark	Language	Chinda LLM 4B	Alternative*
AIME24	English	0.533	0.100
	Thai	0.100	0.000
LiveCodeBench	English	0.665	0.209
	Thai	0.198	0.144
MATH500	English	0.908	0.702
	Thai	0.612	0.566
IFEVAL	English	0.849	0.848
	Thai	0.683	0.740
Language Accuracy	Thai	0.984	0.992
OpenThaiEval	Thai	0.651	0.544
AVERAGE		0.569	0.414

Alternative: scb10x_typhoon2.1-gemma3-4b
Tested by Skythought and Evalscope Benchmark Libraries by iApp Technology team. Results show Chinda LLM 4B achieving 37% better overall performance than the nearest alternative.

✅ Suitable For

🔍 1. RAG Applications (Sovereign AI)

Perfect for building Retrieval-Augmented Generation systems that keep data processing within Thai sovereignty.

📱 2. Mobile and Laptop Applications

Reliable Small Language Model optimized for edge computing and personal devices.

🧮 3. Math Calculation

Excellent performance in mathematical reasoning and problem-solving.

💻 4. Code Assistant

Strong capabilities in code generation and programming assistance.

⚡ 5. Resource Efficiency

Very fast inference with minimal GPU memory consumption, ideal for production deployments.

❌ Not Suitable For

📚 Factual Questions Without Context

As a 4B parameter model, it may hallucinate when asked for specific facts without provided context. Always use with RAG or provide relevant context for factual queries.

🛠️ Quick Start

Installation

pip install transformers torch

Basic Usage

from transformers import AutoModelForCausalLM, AutoTokenizer

model_name = "iapp/chinda-qwen3-4b"

# Load the tokenizer and model
tokenizer = AutoTokenizer.from_pretrained(model_name)
model = AutoModelForCausalLM.from_pretrained(
    model_name,
    torch_dtype="auto",
    device_map="auto"
)

# Prepare the model input
prompt = "อธิบายเกี่ยวกับปัญญาประดิษฐ์ให้ฟังหน่อย"
messages = [
    {"role": "user", "content": prompt}
]

text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True,
    enable_thinking=True  # Enable thinking mode for better reasoning
)

model_inputs = tokenizer([text], return_tensors="pt").to(model.device)

# Generate response
generated_ids = model.generate(
    **model_inputs,
    max_new_tokens=1024,
    temperature=0.6,
    top_p=0.95,
    top_k=20,
    do_sample=True
)

output_ids = generated_ids[0][len(model_inputs.input_ids[0]):].tolist()

# Parse thinking content (if enabled)
try:
    # Find </think> token (151668)
    index = len(output_ids) - output_ids[::-1].index(151668)
except ValueError:
    index = 0

thinking_content = tokenizer.decode(output_ids[:index], skip_special_tokens=True).strip("\n")
content = tokenizer.decode(output_ids[index:], skip_special_tokens=True).strip("\n")

print("🧠 Thinking:", thinking_content)
print("💬 Response:", content)

Switching Between Thinking and Non-Thinking Mode

Enable Thinking Mode (Default)

text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True,
    enable_thinking=True  # Enable detailed reasoning
)

Disable Thinking Mode (For Efficiency)

text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True,
    enable_thinking=False  # Fast response mode
)

API Deployment

Using vLLM

pip install vllm>=0.8.5
vllm serve iapp/chinda-qwen3-4b --enable-reasoning --reasoning-parser deepseek_r1

Using SGLang

pip install sglang>=0.4.6.post1
python -m sglang.launch_server --model-path iapp/chinda-qwen3-4b --reasoning-parser qwen3

Using Ollama (Easy Local Setup)

Installation:

# Install Ollama (if not already installed)
curl -fsSL https://ollama.com/install.sh | sh

# Pull Chinda LLM 4B model
ollama pull iapp/chinda-qwen3-4b

Basic Usage:

# Start chatting with Chinda LLM
ollama run iapp/chinda-qwen3-4b

# Example conversation
ollama run iapp/chinda-qwen3-4b "อธิบายเกี่ยวกับปัญญาประดิษฐ์ให้ฟังหน่อย"

API Server:

# Start Ollama API server
ollama serve

# Use with curl
curl http://localhost:11434/api/generate -d '{
  "model": "iapp/chinda-qwen3-4b",
  "prompt": "สวัสดีครับ",
  "stream": false
}'

Model Specifications:

Size: 2.5GB (quantized)
Context Window: 40K tokens
Architecture: Optimized for local deployment
Performance: Fast inference on consumer hardware

🔧 Advanced Configuration

Processing Long Texts

Chinda LLM 4B natively supports up to 32,768 tokens. For longer contexts, enable YaRN scaling:

{
    "rope_scaling": {
        "rope_type": "yarn",
        "factor": 4.0,
        "original_max_position_embeddings": 32768
    }
}

Recommended Parameters

For Thinking Mode:

Temperature: 0.6
Top-P: 0.95
Top-K: 20
Min-P: 0

For Non-Thinking Mode:

Temperature: 0.7
Top-P: 0.8
Top-K: 20
Min-P: 0

📝 Context Length & Template Format

Context Length Support

Native Context Length: 32,768 tokens
Extended Context Length: Up to 131,072 tokens (with YaRN scaling)
Input + Output: Total conversation length supported
Recommended Usage: Keep conversations under 32K tokens for optimal performance

Chat Template Format

Chinda LLM 4B uses a standardized chat template format for consistent interactions:

# Basic template structure
messages = [
    {"role": "system", "content": "You are a helpful Thai AI assistant."},
    {"role": "user", "content": "สวัสดีครับ"},
    {"role": "assistant", "content": "สวัสดีค่ะ! มีอะไรให้ช่วยเหลือบ้างคะ"},
    {"role": "user", "content": "ช่วยอธิบายเรื่อง AI ให้ฟังหน่อย"}
]

# Apply template with thinking mode
text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True,
    enable_thinking=True
)

Template Structure

The template follows the standard conversational format:

<|im_start|>system
You are a helpful Thai AI assistant.<|im_end|>
<|im_start|>user
สวัสดีครับ<|im_end|>
<|im_start|>assistant
สวัสดีค่ะ! มีอะไรให้ช่วยเหลือบ้างคะ<|im_end|>
<|im_start|>user
ช่วยอธิบายเรื่อง AI ให้ฟังหน่อย<|im_end|>
<|im_start|>assistant

Advanced Template Usage

# Multi-turn conversation with thinking control
def create_conversation(messages, enable_thinking=True):
    # Add system message if not present
    if not messages or messages[0]["role"] != "system":
        system_msg = {
            "role": "system", 
            "content": "คุณเป็น AI ผู้ช่วยที่ฉลาดและเป็นประโยชน์ พูดภาษาไทยได้อย่างเป็นธรรมชาติ"
        }
        messages = [system_msg] + messages
    
    # Apply chat template
    text = tokenizer.apply_chat_template(
        messages,
        tokenize=False,
        add_generation_prompt=True,
        enable_thinking=enable_thinking
    )
    
    return text

# Example usage
conversation = [
    {"role": "user", "content": "คำนวณ 15 × 23 = ?"},
]

prompt = create_conversation(conversation, enable_thinking=True)

Dynamic Mode Switching

You can control thinking mode within conversations using special commands:

# Enable thinking for complex problems
messages = [
    {"role": "user", "content": "/think แก้สมการ: x² + 5x - 14 = 0"}
]

# Disable thinking for quick responses  
messages = [
    {"role": "user", "content": "/no_think สวัสดี"}
]

Context Management Best Practices

Monitor Token Count: Keep track of total tokens (input + output)
Truncate Old Messages: Remove oldest messages when approaching limits
Use YaRN for Long Contexts: Enable rope scaling for documents > 32K tokens
Batch Processing: For very long texts, consider chunking and processing in batches

def manage_context(messages, max_tokens=30000):
    """Simple context management function"""
    total_tokens = sum(len(tokenizer.encode(msg["content"])) for msg in messages)
    
    while total_tokens > max_tokens and len(messages) > 2:
        # Keep system message and remove oldest user/assistant pair
        if messages[1]["role"] == "user":
            messages.pop(1)  # Remove user message
            if len(messages) > 1 and messages[1]["role"] == "assistant":
                messages.pop(1)  # Remove corresponding assistant message
        
        total_tokens = sum(len(tokenizer.encode(msg["content"])) for msg in messages)
    
    return messages

🏢 Enterprise Support

For enterprise deployments, custom training, or commercial support, contact us at:

Email: sale@iapp.co.th
Website: iapp.co.th

❓ Frequently Asked Questions

🏷️ Why is it named "Chinda"?

The name "Chinda" (จินดา) comes from "จินดามณี" (Chindamani), which is considered the first book of Thailand written by Phra Horathibodi (Sri Dharmasokaraja) in the Sukhothai period. Just as จินดามณี was a foundational text for Thai literature and learning, Chinda LLM represents our foundation for Thai sovereign AI - a model that truly understands and thinks in Thai, preserving and advancing Thai language capabilities in the digital age.

⚖️ Can I use Chinda LLM 4B for commercial purposes?

Yes! Chinda LLM 4B is released under the Apache 2.0 License, which allows:

✅ Commercial use - Use in commercial products and services
✅ Research use - Academic and research applications
✅ Modification - Adapt and modify the model
✅ Distribution - Share and redistribute the model
✅ Private use - Use for internal company projects

No restrictions on commercial applications - build and deploy freely!

🧠 What's the difference between thinking and non-thinking mode?

Thinking Mode (enable_thinking=True):

Model shows its reasoning process in <think>...</think> blocks
Better for complex problems, math, coding, logical reasoning
Slower but more accurate responses
Recommended for tasks requiring deep analysis

Non-Thinking Mode (enable_thinking=False):

Direct answers without showing reasoning
Faster responses for general conversations
Better for simple queries and chat applications
More efficient resource usage

You can switch between modes or let users control it dynamically using /think and /no_think commands.

📊 How does Chinda LLM 4B compare to other Thai language models?

Chinda LLM 4B achieves 37% better overall performance compared to the nearest alternative:

Overall Average: 0.569 vs 0.414 (alternative)
Math (MATH500): 0.908 vs 0.702 (English), 0.612 vs 0.566 (Thai)
Code (LiveCodeBench): 0.665 vs 0.209 (English), 0.198 vs 0.144 (Thai)
Thai Language Accuracy: 98.4% (prevents Chinese/foreign text output)
OpenThaiEval: 0.651 vs 0.544

It's currently the highest-scoring Thai LLM in the 4B parameter category.

💻 What are the system requirements to run Chinda LLM 4B?

Minimum Requirements:

GPU: 8GB VRAM (RTX 3070/4060 Ti or better)
RAM: 16GB system memory
Storage: 8GB free space for model download
Python: 3.8+ with PyTorch

Recommended for Production:

GPU: 16GB+ VRAM (RTX 4080/A4000 or better)
RAM: 32GB+ system memory
Storage: SSD for faster loading

CPU-Only Mode: Possible but significantly slower (not recommended for production)

🔧 Can I fine-tune Chinda LLM 4B for my specific use case?

Yes! As an open-source model under Apache 2.0 license, you can:

Fine-tune on your domain-specific data
Customize for specific tasks or industries
Modify the architecture if needed
Create derivatives for specialized applications

Popular fine-tuning frameworks that work with Chinda:

Unsloth - Fast and memory-efficient
LoRA/QLoRA - Parameter-efficient fine-tuning
Hugging Face Transformers - Full fine-tuning
Axolotl - Advanced training configurations

Need help with fine-tuning? Contact our team at sale@iapp.co.th

🌍 What languages does Chinda LLM 4B support?

Primary Languages:

Thai - Native-level understanding and generation (98.4% accuracy)
English - Strong performance across all benchmarks

Additional Languages:

100+ languages supported (inherited from Qwen3-4B base)
Focus optimized for Thai-English bilingual tasks
Code generation in multiple programming languages

Special Features:

Code-switching between Thai and English
Translation between Thai and other languages
Multilingual reasoning capabilities

🔍 Is the training data publicly available?

The model weights are open-source, but the specific training datasets are not publicly released. However:

Base Model: Built on Qwen3-4B (Alibaba's open foundation)
Thai Optimization: Custom dataset curation for Thai language tasks
Quality Focus: Carefully selected high-quality Thai content
Privacy Compliant: No personal or sensitive data included

For research collaborations or dataset inquiries, contact our research team.

🆘 How do I get support or report issues?

For Technical Issues:

GitHub Issues: Report bugs and technical problems
Hugging Face: Model-specific questions and discussions
Documentation: Check our comprehensive guides

For Commercial Support:

Email: sale@iapp.co.th
Enterprise Support: Custom training, deployment assistance
Consulting: Integration and optimization services

Community Support:

Thai AI Community: Join discussions about Thai AI development
Developer Forums: Connect with other Chinda users

📥 How large is the model download and what format is it in?