SK Telecom unveils 688B-parameter A.X K2 model

SK Telecom unveiled A.X K2 on July 30, 2026 as a 688-billion-parameter large language model with open weights.

SK Telecom said A.X K2 is a large language model with 688 billion parameters. The company disclosed that the model has open weights, which means its trained model parameters are being made available under the terms set by SK Telecom.

RCR Wireless reported that SK Telecom is presenting A.X K2 as its largest move so far in sovereign AI in South Korea. The report describes sovereign AI as AI infrastructure and models developed with domestic control and national focus, but the source excerpt does not provide further technical detail on the model’s training, deployment, or commercial availability.

The source material identifies A.X K2 as an AI model announcement by SK Telecom and does not provide eSIM-specific, telecom network, device, pricing, or launch-market details beyond South Korea. The reported facts available from the source are the July 30, 2026 announcement date, the 688-billion-parameter size, the open-weights description, and SK Telecom’s positioning of the model within sovereign AI.