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Rank Model Price
1
Paid
2
Open Source
3
Enterprise
4
Paid

Just the Highlights

Lakera Guard v2

Rank #1
Paid

The Zero-Day Defense. It uses a dynamic 'Immune System' database that updates hourly with new jailbreak vectors (e.g., 'Do Anything Now' variants). It is the industry standard for preventing prompt injection.

Guardrails AI

Rank #2
Open Source

The Open Standard. A Python framework that wraps LLM calls with 'Validators'. It ensures outputs strictly adhere to Pydantic schemas, effectively preventing the model from hallucinating invalid JSON or SQL.

HiddenLayer

Rank #3
Enterprise

The Model Scanner. Unlike others that scan prompts, HiddenLayer scans the *model weights* themselves. It detects if a downloaded model has been 'poisoned' or contains backdoors before you even load it into memory.

Pangea

Rank #4
Paid

The Compliance OS. Essential for GDPR/HIPAA. It offers 'Data Residency as a Service', allowing you to redact PII and route data through specific geographic gateways to ensure compliance without building your own filters.