OpenAI GPT-4o Mini: LLM Security & Jailbreak Resistance
As of 2026-07-04, OpenAI GPT-4o Mini has an attack success rate (ASR) of 26.7% on Guardion's LLM Vulnerability benchmark — ranking #29 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 GPT-4o Mini compares
Frequently asked questions
How secure is OpenAI GPT-4o Mini against jailbreaks?
OpenAI GPT-4o Mini is moderately resistant — a meaningful share of adversarial prompts succeed. On Guardion's LLM Vulnerability benchmark it records a 26.7% attack success rate (73.3% robustness), ranking #29 of 93 models.
What is GPT-4o Mini's attack success rate (ASR)?
GPT-4o Mini's overall ASR is 26.7% — the share of adversarial prompts that elicit harmful output across zero-shot, TAP, and Crescendo attacks. Lower is safer.
Is GPT-4o Mini more secure than GPT-5.2 Pro?
GPT-5.2 Pro is more robust: 3.8% ASR vs GPT-4o Mini's 26.7%. See the full head-to-head comparison for the per-attack breakdown.
How can I make GPT-4o Mini 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 GPT-4o Mini.
Harden GPT-4o Mini in production
Guardion's runtime guardrails block jailbreaks and prompt injection before they reach any model — with sub-130ms policy decisions.
Request a demo