Arthur Shield
Enterprise LLM firewall providing real-time protection against prompt injection, hallucinations, toxicity, and data leakage for production AI applications
$60M+
Total Funding
<100ms
Latency
Fortune 500
Customers
Overview
Arthur Shield is an enterprise-grade LLM firewall developed by Arthur AI, a New York-based AI observability company founded in 2018. Shield acts as a real-time security layer between users and LLM applications, detecting and blocking harmful inputs and outputs including prompt injections, jailbreaks, sensitive data leakage, hallucinations, and toxic content. Built on Arthur's deep expertise in ML model monitoring and observability, Shield provides enterprise customers with the guardrails needed to deploy generative AI applications safely at scale. The platform offers both API-based integration and on-premise deployment options for organizations with strict data residency requirements.
The Verdict
Who Should Use Arthur Shield?
Best For
- Enterprise teams deploying customer-facing LLM applications
- Regulated industries (finance, healthcare) needing compliance
- Organizations requiring on-premise deployment options
- Teams already using Arthur for ML observability
- Companies prioritizing low-latency, high-throughput protection
Not Ideal For
- Startups or small teams (enterprise pricing)
- Developers wanting open-source flexibility
- Quick prototyping without procurement cycles
- Teams needing extensive customization of detection rules
- Budget-constrained projects seeking free tiers
What's Great
- Comprehensive protection suite (injection, PII, hallucination, toxicity)
- Sub-100ms latency for real-time applications
- On-premise deployment for sensitive environments
- Deep integration with Arthur Scope for observability
- Enterprise-grade SLAs and support
- Proven in Fortune 500 deployments
Watch Out For
- Enterprise-only pricing (no public tiers)
- Longer sales cycles for procurement
- Less community ecosystem than open-source alternatives
- May require professional services for complex deployments
- Limited self-serve documentation compared to OSS options
Pricing
Starter
Contact Sales
Core Shield protection, API access
Enterprise
Custom
Full platform, on-premise, dedicated support
Enterprise+
Custom
Arthur Scope + Shield, advanced observability
Core Shield Features
Input Protection
- Prompt injection detection
- Jailbreak attempt blocking
- PII/sensitive data detection
- Toxicity and profanity filtering
- Off-topic request detection
Output Protection
- Hallucination detection
- Sensitive data leakage prevention
- Content policy enforcement
- Response quality validation
- Factual grounding checks
Deployment Options
Cloud (SaaS)
- Hosted on Arthur infrastructure
- Quick deployment via API
- Managed updates and scaling
- SOC 2 Type II compliant
- 99.9% uptime SLA
On-Premise / VPC
- Deploy in your environment
- Air-gapped installation option
- Full data residency control
- HIPAA and PCI-DSS ready
- Custom security configurations
Arthur Platform Integration
Arthur Scope
- LLM observability and monitoring
- Performance metrics tracking
- Drift detection
- Cost analytics
- Unified dashboard
Combined Benefits
- Shield + Scope unified view
- Threat correlation with performance
- Historical audit trails
- Compliance reporting
- Alerting and notifications
Platform & Integrations
LLM Providers
- OpenAI (GPT-4, GPT-3.5)
- Anthropic (Claude)
- Azure OpenAI Service
- Amazon Bedrock
- Google Vertex AI
- Custom/self-hosted models
Arthur Documentation
Integration Methods
- REST API (OpenAI-compatible)
- Python SDK
- LangChain integration
- Proxy/middleware deployment
- Kubernetes operators
- Terraform modules
Arthur Docs
Enterprise Features
- SSO/SAML integration
- Role-based access control
- Audit logging
- Custom policy definitions
- Webhook notifications
- SIEM integration
Arthur Security
How It Compares
| Feature | Arthur Shield | Guardrails AI | Lakera Guard | NeMo Guardrails |
|---|---|---|---|---|
| Type | Commercial | Open Source | Commercial | Open Source |
| Pricing | Enterprise | Free / Pro | Usage-based | Free |
| On-Premise | Yes | Self-host | No | Self-host |
| Latency | <100ms | Variable | <50ms | Variable |
| Hallucination Detection | Yes | Limited | No | Yes |
| PII Detection | Yes | Yes | Yes | Yes |
| Prompt Injection | Yes | Limited | Yes | Yes |
| Observability Built-in | Yes (Scope) | No | Basic | No |
| Enterprise Support | Yes | Pro only | Yes | Community |
| Best For | Enterprise compliance | Developer flexibility | API-first security | NVIDIA ecosystem |
Alternatives
Open Source Options
- Guardrails AI - Validator library with hub
- NeMo Guardrails - NVIDIA's toolkit
- LLM Guard - Protect AI's OSS scanner
Commercial Alternatives
- Lakera Guard - API-first, Check Point backed
- Robust Intelligence - Cisco's AI firewall
- Prompt Security - Prompt-level protection
User Reviews
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