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An experimental, unofficial LoRA on XHToken/Spark-X2.6-4B for defensive source-code vulnerability review, meant to run as an agent with read-only tools (list/read/grep) and enable_thinking=False. It separates vulnerable from unrelated code chunks slightly better than the base model (AUC 0.61â0.67 on JavaScript), but as an agent it is weaker than the pre-safety-fix checkpoint: in over 60% of runs it ends without a verdict, mostly by reading files until the step limit, and it located the vulnerable line without flagging the fixed version in only 6 of 96 pairs (base 1, pre-safety-fix checkpoint 14), and explicitly called the fixed version safe in only 5 of those (base 0, pre-safety-fix checkpoint 12). Knowledge (MMLU-Pro science) dropped 9 points below the base model. Do not rely on it for security decisions. No exploit code, PoCs or attack steps were used in training, and it is trained to refuse requests for exploits.
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