Microsoft Phi-4: LLM Security & Jailbreak Resistance
As of 2026-07-04, Microsoft Phi-4 has an attack success rate (ASR) of 30.0% on Guardion's LLM Vulnerability benchmark — ranking #34 of 93 models. It is moderately resistant — a meaningful share of adversarial prompts succeed.
Attack Success Rate (ASR) is the share of adversarial prompts that elicit harmful output across zero-shot, TAP, and Crescendo attacks (HarmBench framework). Lower is safer. "Est." models are calibrated from public safety evaluations pending a Guardion benchmark run.
How Phi-4 compares
Frequently asked questions
How secure is Microsoft Phi-4 against jailbreaks?
Microsoft Phi-4 is moderately resistant — a meaningful share of adversarial prompts succeed. On Guardion's LLM Vulnerability benchmark it records a 30.0% attack success rate (70% robustness), ranking #34 of 93 models (estimated from public safety evaluations).
What is Phi-4's attack success rate (ASR)?
Phi-4's overall ASR is 30.0% — the share of adversarial prompts that elicit harmful output across zero-shot, TAP, and Crescendo attacks. Lower is safer.
Is Phi-4 more secure than Qwen3-235B-A22B-Thinking?
They are evenly matched at about 30.0% ASR. See the full head-to-head comparison for the per-attack breakdown.
How can I make Phi-4 safer to deploy?
Even robust models are bypassed under sustained attack. An inline runtime guardrail that classifies prompts and responses — like Guardion's prompt-defense models — blocks jailbreaks and prompt injection before they reach Phi-4.
Harden Phi-4 in production
Guardion's runtime guardrails block jailbreaks and prompt injection before they reach any model — with sub-130ms policy decisions.
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