December 2025 Release Notes

Arthur Platform

• Arthur is solving the agent visibility gap with the launch of the industry’s first Agentic Discovery & Governance (ADG) Platform. Arthur’s ADG platform was built to turn agent chaos into a structured, scalable operation.
  • Learn more about building your company's ADG strategy.
• New agentic features are arriving in January 2026 that will provide powerful tools for testing, tracing, and deploying agent based workflows.
  • Interested in trying it first? Email [email protected] to join the early access group.

Arthur Evals Engine OSS

New Features

• Test & Preview Custom Metrics Before Saving: Users can now validate their custom metrics directly within the creation and editing workflow.
• Users can run the metric against available datasets to preview results and confirm the logic behaves as expected before saving.

Bug Fixes

• Sketch metrics can now be created and calculated without specifying any dimension columns. Frontend No Longer Overwrites User-Defined Metadata for Reported Metrics.

Community

Venture Backed Startup?

• Join Arthur’s Start Up Partner Program: If you’re building a venture-backed startup that uses AI Agents and are trying to figure out how to reliably ship them to production, this program is perfect for you. Apply Today