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A.X-K1

docs/source/en/model_doc/axk1.md

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This model was contributed to Hugging Face Transformers on 2026-07-23.

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A.X-K1

A.X-K1 is SK Telecom's Mixture-of-Experts large language model. It is built on the DeepSeek-V3 architecture — Multi-head Latent Attention (MLA) with a grouped sigmoid top-k MoE and a shared expert — with one SK Telecom modification: an extra post_mlp_layernorm applied to the MoE block output before the residual add. The first layer is dense and the rest are MoE.

Because attention is standard (dense) MLA, A.X-K1 runs under all attention backends (FlashAttention-2, SDPA, and eager).

The example below shows how to generate text with [Pipeline] or the [AutoModel].

<hfoptions id="usage"> <hfoption id="Pipeline">
python
from transformers import pipeline

pipe = pipeline(
    task="text-generation",
    model="skt/A.X-K1",
)

print(pipe("대한민국의 수도는", max_new_tokens=32)[0]["generated_text"])
</hfoption> <hfoption id="AutoModel">
python
from transformers import AutoModelForCausalLM, AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained("skt/A.X-K1")
model = AutoModelForCausalLM.from_pretrained(
    "skt/A.X-K1",
    device_map="auto",
)

inputs = tokenizer("대한민국의 수도는", return_tensors="pt").to(model.device)
outputs = model.generate(**inputs, max_new_tokens=32, do_sample=False)
print(tokenizer.decode(outputs[0], skip_special_tokens=True))
</hfoption> </hfoptions>

AXK1Config

[[autodoc]] AXK1Config

AXK1Model

[[autodoc]] AXK1Model - forward

AXK1ForCausalLM

[[autodoc]] AXK1ForCausalLM - forward

AXK1ForSequenceClassification

[[autodoc]] AXK1ForSequenceClassification - forward

AXK1ForTokenClassification

[[autodoc]] AXK1ForTokenClassification - forward