Qwen Guard (4B) reaches 83.97% recall on a 79k NIST-aligned safety benchmark while larger models such as Llama Guard 12B and GPT-OSS 20B miss up to 75% of unsafe content; model size does not predict detection performance.
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Benchmarking Open-Source Safety Guard Models: A Comprehensive Evaluation
Qwen Guard (4B) reaches 83.97% recall on a 79k NIST-aligned safety benchmark while larger models such as Llama Guard 12B and GPT-OSS 20B miss up to 75% of unsafe content; model size does not predict detection performance.