Arthur
Arthurai, Inc.
Performance and safety for LLMs and classic ML.
Last verified April 21, 2026About Arthur
Arthur is an AI performance and safety platform founded in 2018 and headquartered in New York City. The platform provides monitoring, explainability, and bias detection for production ML, plus Arthur Shield for LLM firewall and red-teaming. Arthur raised a $42M Series B in September 2022 led by Acrew Capital and Greycroft, bringing total funding to approximately $56M.
Framework coverage
Coverage claims documented by Arthur on their own materials. Chip shading reflects the strength of the claim, not an independent audit.
EU · in force
US · voluntary
Capabilities
Features Arthur markets publicly. Inclusion means the capability is documented — not that it's best-in-class.
AI Model Inventory
Centralized registry of all AI/ML models in use across the organization, with ownership, lifecycle stage, and risk classification.
Policy Management
Authoring, versioning, and distribution of AI usage policies mapped to regulations.
Bias & Fairness Testing
Automated statistical testing for disparate impact across protected attributes, with audit-ready reports.
Explainability
SHAP, LIME, counterfactual, and feature-importance explanations for model decisions.
Model Monitoring
Production monitoring for performance, drift, data quality, and fairness regressions.
LLM Guardrails & Content Filtering
Runtime guardrails that block or redact unsafe prompts and responses in production LLM applications.
Audit Evidence Collection
Automated collection, hashing, and retention of evidence (model cards, test results, approvals) for audit.
Integrations
Documented by Arthur in public product materials.
- AWS SageMaker
- Google Vertex AI
- Databricks
- Snowflake
- OpenAI API
- Anthropic API
- GitHub
Pricing
Shield has a free tier; enterprise monitoring is contact-only.
Pros and cons
Pros
- Strong LLM firewall (Shield) with hallucination, PII, and toxicity controls
- Mature production monitoring for classic ML
- NYC footprint — close to financial services customers
Cons
- Smaller than some governance-pure peers
- Policy/GRC layer less developed than Credo AI, Trustible
Alternatives to Arthur
Frequently asked
What is Arthur Shield?+
Arthur Shield is a runtime firewall for LLM applications that blocks and audits unsafe prompts and responses — hallucinations, prompt injection, PII leaks, toxicity — with low-latency inline deployment.
Sources
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