Google Gemini 2.5 Pro vs Google Gemini 2.0 Flash
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 Gemini 2.0 Flash scores 33.6% on attack success rate (ASR) (lower is better).
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 Google Gemini 2.0 Flash. Green marks the safer model on each metric.
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 Google Gemini 2.0 Flash 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 Gemini 2.0 Flash scores 33.6% on attack success rate (ASR) (lower is better).
What is the attack success rate (ASR) of Gemini 2.5 Pro vs Gemini 2.0 Flash?
Gemini 2.5 Pro has a 16.1% ASR and Gemini 2.0 Flash has a 33.6% 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 Gemini 2.0 Flash 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.