Google Gemini 2.5 Pro vs xAI Grok-4 Heavy
Detailed comparison for LLMs
On Guardion's LLM vulnerability Benchmark, Google Gemini 2.5 Pro is the more secure of the two: Gemini 2.5 Pro scores 16.1% and Grok-4 Heavy scores 18.0% 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
Gemini 2.5 Pro is the overall winner in this comparison!
Attack Success Rate (lower is safer)
ASR for Google Gemini 2.5 Pro vs xAI Grok-4 Heavy. Green marks the safer model on each metric. Only the overall score is available for estimated models.
Overall (ASR)
TAP Attack Method (ASR)
Crescendo Attack Method (ASR)
Zero-Shot (ASR)
Key Highlights
- Google Gemini 2.5 Pro has a lower Overall (ASR).
- Google Gemini 2.5 Pro has a lower TAP Attack Method (ASR).
- Google Gemini 2.5 Pro has a lower Crescendo Attack Method (ASR).
- Google Gemini 2.5 Pro has a lower Zero-Shot (ASR).
Security Profile
Outward is better on every axis.
Frequently asked questions
Is Google Gemini 2.5 Pro or xAI Grok-4 Heavy more secure?
On Guardion's LLM vulnerability Benchmark, Google Gemini 2.5 Pro is the more secure of the two: Gemini 2.5 Pro scores 16.1% and Grok-4 Heavy scores 18.0% 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 Gemini 2.5 Pro vs Grok-4 Heavy?
Gemini 2.5 Pro has a 16.1% ASR and Grok-4 Heavy has a 18.0% ASR — the share of adversarial prompts that succeed across zero-shot, TAP, and Crescendo attacks. Lower is safer.
How were Gemini 2.5 Pro and Grok-4 Heavy 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.