Alibaba's XekRung Tops CyberGym Leaderboard at 88.9%

Alibaba's security-focused LLM XekRung-1.5-27B-Preview took first place on UC Berkeley's CyberGym vulnerability-reproduction benchmark with an 88.9% success rate. Fine-tuned from Qwen3.8-27B, which scored 54.51%, it beat Gemini 3.8 Flash Cyber (86.3%) and GPT-5.5-Cyber (85.6%). Weights remain unreleased.

• XekRung-1.5-27B-Preview scored 88.9% on CyberGym; base Qwen3.8-27B scored 54.51%
• CyberGym holds 1,507 real vulnerabilities from 188 OSS-Fuzz open-source projects
• It leads Gemini 3.8 Flash Cyber (86.3%), GPT-5.5-Cyber (85.6%) and GLM-5.3 (84.5%)
• Model weights are not released and no timeline for outside access was given