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Best LLM guardrails tool

3 models · updated 2026-06-29

The verdict

Guardrails AI leads — All 3 models rank Guardrails AI the top startup.

Combined ranking

  1. 1
    Guardrails AI—12 pts
    GPT #2Claude #2Gemini #2· Flexible validation framework with broad developer adoption.
  2. 2
    Lakera Guard—9 pts
    GPT #3Claude #3Gemini #3· Strong prompt-injection and data-leakage protection.
  3. 3
    Protect AI—2 pts
    GPT —Claude #4Gemini —· Comprehensive open-source scanners for PII, toxicity, and prompt injection on inputs and outputs.
  4. 4
    Arthur Shield—1 pts
    GPT —Claude —Gemini #5· Enterprise-grade firewall offering real-time data leakage prevention and toxicity defense.

Not ranked (incumbents): NVIDIA NeMo Guardrails, NeMo Guardrails, Llama Guard, Microsoft Azure AI Content Safety, Azure AI Content Safety, LlamaFirewall

By model

ChatGPT

  1. 1.NVIDIA NeMo Guardrails
  2. 2.Guardrails AI
  3. 3.Lakera Guard
  4. 4.Microsoft Azure AI Content Safety
  5. 5.LlamaFirewall

Claude

  1. 1.NVIDIA NeMo Guardrails
  2. 2.Guardrails AI
  3. 3.Lakera Guard
  4. 4.Protect AI
  5. 5.Azure AI Content Safety

Gemini

  1. 1.NeMo Guardrails
  2. 2.Guardrails AI
  3. 3.Lakera Guard
  4. 4.Llama Guard
  5. 5.Arthur Shield

Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled continuously