Input/output validation, PII protection, content moderation, and prompt injection defence.
Add input/output validation and safety rails to LLM calls
Cleanest Python API for defining validators on LLM inputs and outputs. RAIL spec and Pydantic-based guards. Retry on failure is well-designed. Server mode needed for prod latency.
NVIDIA toolkit for programmable guardrails via Colang language
Unique dialogue-flow approach using Colang DSL. Best for complex multi-turn conversation policies. Steeper learning curve than Guardrails AI but richer for conversation steering.
Meta's fine-tuned safety classifier for prompt and response screening — now natively multimodal
Production-deployable content moderation model, shipped alongside the Llama 4 herd with native image+text screening in a single dense model (no separate vision variant needed anymore). Run it as a sidecar to screen every input/output. MLCommons hazard taxonomy built in. Free, open-weight, and fast on a single GPU.
Prompt injection detection API for LLM applications
Purpose-built for prompt injection detection — a real attack vector in RAG systems. Uses a canary token technique alongside an LLM classifier. Early-stage; combine with input sanitization.
Data protection and anonymization for PII in LLM pipelines
Best open-source PII detection and anonymization library. Detect-and-replace SSN, emails, credit cards before sending to LLMs. Critical for GDPR/HIPAA compliance in RAG.
Real-time prompt injection and jailbreak protection API
Sub-millisecond inference for prompt injection detection. Managed API means zero infra. Integrates as middleware. Best for teams that want safety without building classifiers.
Microsoft's content moderation API for text and images
Enterprise-grade content filtering integrated into Azure OpenAI. Fine-grained severity thresholds for hate, violence, sexual content, and self-harm. Required for regulated use cases on Azure.
Principle-based self-improvement for harmlessness and helpfulness
Pioneering approach where the model critiques and revises its own outputs based on a set of principles. Built into Claude models. Influence on the field is massive even if not a standalone product.
