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SK Telecom released A.X 4.0 (pronounced "A dot X"), a large language model (LLM) optimized for Korean-language understanding and enterprise deployment, on July 03, 2025. Built on the open-source Qwen2.5 model, A.X 4.0 has been further trained with large-scale Korean datasets to deliver outstanding performance in real-world business environments.
transformers>=4.46.0 or the latest version is required to use skt/A.X-4.0-Lightbash
pip install transformers>=4.46.0
python
import torchfrom transformers import AutoModelForCausalLM, AutoTokenizermodel_name = "skt/A.X-4.0-Light"model = AutoModelForCausalLM.from_pretrained(model_name,torch_dtype=torch.bfloat16,device_map="auto",)model.eval()tokenizer = AutoTokenizer.from_pretrained(model_name)messages = [{"role": "system", "content": "당신은 사용자가 제공하는 영어 문장들을 한국어로 번역하는 AI 전문가입니다."},{"role": "user", "content": "The first human went into space and orbited the Earth on April 12, 1961."},]input_ids = tokenizer.apply_chat_template(messages, add_generation_prompt=True, return_tensors="pt").to(model.device)with torch.no_grad():output = model.generate(input_ids,max_new_tokens=128,do_sample=False,)len_input_prompt = len(input_ids[0])response = tokenizer.decode(output[0][len_input_prompt:], skip_special_tokens=True)print(response)# Output:# 1961년 4월 12일, 최초의 인간이 우주로 나가 지구를 공전했습니다.
vllm>=v0.6.4.post1 or the latest version is required to use tool-use functionbash
pip install vllm>=v0.6.4.post1# if you don't want to activate tool-use function, just commenting out below vLLM optionVLLM_OPTION="--enable-auto-tool-choice --tool-call-parser hermes"vllm serve skt/A.X-4.0-Light $VLLM_OPTION
python
from openai import OpenAIdef call(messages, model):completion = client.chat.completions.create(model=model,messages=messages,)print(completion.choices[0].message)client = OpenAI(base_url="http://localhost:8000/v1",api_key="api_key")model = "skt/A.X-4.0-Light"messages = [{"role": "user", "content": "에어컨 여름철 적정 온도는? 한줄로 답변해줘"}]call(messages, model)# Output:# ChatCompletionMessage(content='여름철 적정 에어컨 온도는 일반적으로 24-26도입니다.', refusal=None, role='assistant', audio=None, function_call=None, tool_calls=[], reasoning_content=None)messages = [{"role": "user", "content": "What is the appropriate temperature for air conditioning in summer? Response in a single sentence."}]call(messages, model)# Output:# ChatCompletionMessage(content='The appropriate temperature for air conditioning in summer generally ranges from 72°F to 78°F (22°C to 26°C) for comfort and energy efficiency.', refusal=None, role='assistant', audio=None, function_call=None, tool_calls=[], reasoning_content=None)
python
from openai import OpenAIdef call(messages, model):completion = client.chat.completions.create(model=model,messages=messages,tools=tools)print(completion.choices[0].message)client = OpenAI(base_url="http://localhost:8000/v1",api_key="api_key")model = "skt/A.X-4.0-Light"calculate_discount = {"type": "function","function": {"name": "calculate_discount","description": "원가격과 할인율(퍼센트 단위)을 입력받아 할인된 가격을계산한다.","parameters": {"type": "object","properties": {"original_price": {"type": "number","description": "상품의 원래 가격"},"discount_percentage": {"type": "number","description": "적용할 할인율(예: 20% 할인의 경우 20을 입력)"}},"required": ["original_price", "discount_percentage"]}}}get_exchange_rate = {"type": "function","function": {"name": "get_exchange_rate","description": "두 통화 간의 환율을 가져온다.","parameters": {"type": "object","properties": {"base_currency": {"type": "string","description": "The currency to convert from."},"target_currency": {"type": "string","description": "The currency to convert to."}},"required": ["base_currency", "target_currency"]}}}tools = [calculate_discount, get_exchange_rate]### Slot filling ###messages = [{"role": "user", "content": "우리가 뭘 사야되는데 원래 57600원인데 직원할인 받을 수 있거든? 할인가좀 계산해줘"}]call(messages, model)# Output:# ChatCompletionMessage(content='할인율을 알려주시겠습니까?', refusal=None, role='assistant', audio=None, function_call=None, tool_calls=[], reasoning_content=None)### Function calling ###messages = [{"role": "user", "content": "우리가 뭘 사야되는데 원래 57600원인데 직원할인 받을 수 있거든? 할인가좀 계산해줘"},{"role": "assistant", "content": "할인율을 알려주시겠습니까?"},{"role": "user", "content": "15% 할인 받을 수 있어."},]call(messages, model)# Output:# ChatCompletionMessage(content=None, refusal=None, role='assistant', audio=None, function_call=None, tool_calls=[ChatCompletionMessageToolCall(id='chatcmpl-tool-7778d1d9fca94bf2acbb44c79359502c', function=Function(arguments='{"original_price": 57600, "discount_percentage": 15}', name='calculate_discount'), type='function')], reasoning_content=None)### Completion ###messages = [{"role": "user", "content": "우리가 뭘 사야되는데 원래 57600원인데 직원할인 받을 수 있거든? 할인가좀 계산해줘"},{"role": "assistant", "content": "할인율을 알려주시겠습니까?"},{"role": "user", "content": "15% 할인 받을 수 있어."},{"role": "tool", "tool_call_id": "random_id", "name": "calculate_discount", "content": "{\"original_price\": 57600, \"discount_percentage\": 15, \"discounted_price\": 48960.0}"}]call(messages, model)# Output:# ChatCompletionMessage(content='57600원의 상품에서 15% 할인을 적용하면, 할인된 가격은 48960원입니다.', refusal=None, role='assistant', audio=None, function_call=None, tool_calls=[], reasoning_content=None)
The A.X 4.0 Light model is licensed under Apache License 2.0.
markdown
@article{SKTAdotX4Light,title={A.X 4.0 Light},author={SKT AI Model Lab},year={2025},url={https://huggingface.co/skt/A.X-4.0-Light}}