A.X K2
A.X K2 is a foundation model from SK Telecom, released on July 29, 2026, built under the Korean government’s Sovereign AI foundation model project and trained from scratch in FP8. SK Telecom says it succeeds the 519B-parameter A.X K1 with stronger math, science, Korean-language and long-context reasoning.
Released
July 29, 2026
Type
llm
License
open-weight
Apache 2.0
Context
262,144 tokens
128K tokens trained natively, extended to 262,144 with YaRN scaling.
Capabilities
textreasoningmultilingual
Architecture
Parameters: 688B total, 33B active (Mixture of Experts)
Sources
Every figure on this page was checked against these pages on . A figure we could not source is left out.
- SK Telecom newsroom: SK Telecom Unveils A.X K2 (opens in a new tab)
- Hugging Face: skt/A.X-K2 (opens in a new tab)
- A.X K2 technical report (arXiv 2608.30181) (opens in a new tab)
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