Arthur Engine
Open-source, real-time evaluation engine for generative AI and traditional ML models: instant analysis of outputs, active guardrails, and built-in plus customizable metrics, run inside a user's own infrastructure independently of the hosted Arthur platform.
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MIT licensed (confirmed via the GitHub API's license field). Repo actively maintained -- last pushed the same day this record was written.
What it does
- Evaluation and observability
Sources
- Pricing
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Official documentation · 13 Sep 2026
GitHub API repository metadata: license.spdx_id = MIT.
- Description
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Arthur's own announcement: "open-source, real-time AI evaluation engine for both Generative AI and Traditional ML models"; "developers can use the free Engine independently" of the paid Arthur Platform, which 'layers on' for enterprise features.
- Sold within
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Official documentation · 15 Sep 2026
GitHub repo (already cited official-docs elsewhere on this record); downloaded directly, independent of the hosted Arthur platform.
- URL
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Official documentation · 13 Sep 2026
Repository home; GitHub API license field returns MIT.
- Deployment
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Announcement: runs "inside your own stack" with no third-party data transmission.
Also from Arthur AI
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Arthur Platform
AI observability platform monitoring model performance, bias, drift and behavior for ML and generative AI/agentic applications in production, built on an open-source evals engine.
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Arthur Agent Security & Governance Application
Module within the Arthur AI Platform providing security scanning, policy enforcement and governance controls specifically for autonomous agent deployments (tool-use permissions, action auditing, risk scoring).
Open Arthur AI in the directory
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