Build. Experiment. Scale. Now With Open-Source AI Evaluation.
AI is evolving fast—but making it work at scale remains a challenge. Today, Arthur is launching the Arthur Engine, the first open-source, real-time AI evaluation engine designed to help teams monitor, debug, and improve Generative AI and traditional ML models. No black-box monitoring. No third-party dependencies. No data privacy risks. All for free.
Why Real-Time AI Evaluation Matters in 2025
As AI adoption grows, so do its risks. Without real-time evaluation, organizations face:
- Data leaks— 8.5% of employee prompts contain sensitive data (Harmonic Security).
- Model degradation— AI models drift over time without ongoing monitoring.
- Debugging nightmares – Slow iteration cycles lead to poor model performance.
The Arthur Engine solves these challenges by providing instant visibility, real-time guardrails, and on-the-fly model optimization—right inside your own environment.
“AI is moving fast, and we need to ensure it moves in the right direction. Open-sourcing the Arthur Engine puts powerful AI evaluation tools into the hands of developers, researchers, and builders worldwide.”
— Ashley Nader, Lead AI PM at Arthur
What Makes Arthur Engine Different?
Unlike traditional AI monitoring tools, Arthur Engine runs locally—preserving data sovereignty and eliminating compliance risks.
- Real-Time AI Evaluation – Instantly detect failures before they impact production.
- Active Guardrails – Intervene in real-time to prevent hallucinations and bad outputs.
- Customizable Metrics – Tailor evaluations to your specific AI use case.
- Privacy-Preserving & Secure – Keep all data inside your infrastructure.
- Works Across All Models – Supports GPT, Claude, Gemini, open weights models, and traditional ML.
“By open-sourcing Arthur Engine, we’re making AI trust and safety accessible to all developers—allowing them to safeguard AI systems with fully customizable, high-performance monitoring tools.”
— Cherie Xu, Technical Lead, Machine Learning at Arthur
AI Evaluation, Built for the Future
The Arthur Engine is part of Arthur’s broader AI performance monitoring suite, designed to help organizations:
- Validate AI outputs in real time
- Detect performance shifts before they become problems
- Ensure regulatory compliance and explainability
This open-source release marks a new standard in AI transparency, security, and performance monitoring.
- Explore Arthur Engine on GitHub
- Join the waitlist for the new Arthur Platform
AI is reshaping the world—let’s make sure it performs the way it should.
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