Google Gemini 2.5 Pro: LLM Security & Jailbreak Resistance
As of 2026-07-04, Google Gemini 2.5 Pro has an attack success rate (ASR) of 16.1% on Guardion's LLM Vulnerability benchmark — ranking #17 of 93 models. It is strongly resistant to jailbreaks, with occasional bypasses under sustained attack.
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 Gemini 2.5 Pro compares
Frequently asked questions
How secure is Google Gemini 2.5 Pro against jailbreaks?
Google Gemini 2.5 Pro is strongly resistant to jailbreaks, with occasional bypasses under sustained attack. On Guardion's LLM Vulnerability benchmark it records a 16.1% attack success rate (83.9% robustness), ranking #17 of 93 models.
What is Gemini 2.5 Pro's attack success rate (ASR)?
Gemini 2.5 Pro's overall ASR is 16.1% — the share of adversarial prompts that elicit harmful output across zero-shot, TAP, and Crescendo attacks. Lower is safer.
Is Gemini 2.5 Pro more secure than Gemini 3 Pro?
Gemini 3 Pro is more robust: 6.0% ASR vs Gemini 2.5 Pro's 16.1%. See the full head-to-head comparison for the per-attack breakdown.
How can I make Gemini 2.5 Pro 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 Gemini 2.5 Pro.
Harden Gemini 2.5 Pro 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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