A.X K2 debuts as Korea’s largest open LLM with 688B parameters
teortaxesTex · x · 2026-07-29
A.X K2 launches as Korea’s largest open LLM with 688B total parameters
A.X K2 has been released as the largest open Korean LLM to date and another result of the Korean government’s Sovereign AI foundation model project.
The model is described as a Mixture-of-Experts system with:
- 688B total parameters and 33B active parameters
- a Think-Fusion training recipe that supports both thinking and non-thinking modes
- Gated Transformer Blocks with Sparse Gated Attention and Gated Norm for stable training and efficient inference
The post also shows benchmark comparisons versus models including A.X K1, Qwen3.5, Nemotron 3 Ultra, DeepSeek-V4 Flash, and GLM-5. In the shown table, A.X K2 leads on several tasks such as AIME26, Apex, KMMU-Pro, CLICK, LiveCodeBench v6, and τ²-Bench, while other models still win on some individual rows like KMO26 and KoBALT.
Related event: South Korea Releases A.X K2, a 688B-Parameter Open-Source Model(2 posts)→
More from Models
- Rumor: GLM 5.5 and Kimi K3.1 dropping soon, possibly slowed by anti-distillation blocks — zephyr_z9 · 2026-10-16
- Thrive Holdings benchmarks AI on real tax and IT work across 75+ firms — BorisMPower · 2026-10-16
- Google Downgrading Prepaid Annual Gemini AI Plus Plans, Cutting Pro Access Nov 13 — Ray_ProUser · 2026-10-16
- A Little Encouragement Makes a Small Local Model Draw a Stunning Pelican SVG — Fancy-Snow7 · 2026-10-16
- Rapid-MLX 0.16.2 brings NVIDIA Nemotron 3.5 up to 120B to Apple Silicon Macs — kuchaev · 2026-10-16
- "End of Chinese OSS" claim pushed back: open models get license almost automatically — eliebakouch · 2026-10-16