Meta Llama 3H 405B vs Meta Llama 4 Behemoth
Detailed comparison for LLMs
On Guardion's LLM vulnerability Benchmark, Meta Llama 4 Behemoth is the more secure of the two: Llama 3H 405B scores 36.6% and Llama 4 Behemoth scores 25.0% on attack success rate (ASR) (lower is better). One or both scores are estimated from public safety evaluations pending a Guardion benchmark run.
Head-to-Head Overview
Llama 4 Behemoth is the overall winner in this comparison!
Attack Success Rate (lower is safer)
ASR for Meta Llama 3H 405B vs Meta Llama 4 Behemoth. Green marks the safer model on each metric. Only the overall score is available for estimated models.
Overall (ASR)
Zero-Shot (ASR)
Key Highlights
- Meta Llama 4 Behemoth has a lower Overall (ASR).
Frequently asked questions
Is Meta Llama 3H 405B or Meta Llama 4 Behemoth more secure?
On Guardion's LLM vulnerability Benchmark, Meta Llama 4 Behemoth is the more secure of the two: Llama 3H 405B scores 36.6% and Llama 4 Behemoth scores 25.0% on attack success rate (ASR) (lower is better). One or both scores are estimated from public safety evaluations pending a Guardion benchmark run.
What is the attack success rate (ASR) of Llama 3H 405B vs Llama 4 Behemoth?
Llama 3H 405B has a 36.6% ASR and Llama 4 Behemoth has a 25.0% ASR — the share of adversarial prompts that succeed across zero-shot, TAP, and Crescendo attacks. Lower is safer.
How were Llama 3H 405B and Llama 4 Behemoth tested?
Both were red-teamed with the HarmBench framework across zero-shot, TAP (Tree of Attacks with Pruning), and Crescendo multi-turn attacks, scored by Attack Success Rate.