Fiddler AI

Fiddler AI is an AI observability, evaluation, security, and governance platform that helps enterprises monitor, evaluate, debug, and control AI applications and agents throughout their lifecycle. Founded to make AI more explainable and trustworthy, Fiddler has expanded into an AI Control Plane that provides visibility, context, policy enforcement, and governance for enterprise AI systems.

Fiddler provides unified observability for both predictive AI and agentic applications, allowing engineering and AI teams to monitor application behavior, inspect traces, evaluate outputs, identify root causes, and understand how AI systems make decisions. Its evaluation capabilities include custom evaluators, bring-your-own judges, experiments, tests, and task-specific AI evaluations, helping teams measure and improve AI quality before and after deployment.

The platform also provides runtime AI guardrails designed to detect and prevent threats such as hallucinations, toxicity, PII and PHI exposure, prompt injection, and jailbreak attempts. Fiddler Centor Models power low-latency guardrails and evaluations while allowing organizations to keep sensitive data within their environment. Teams can also use their preferred external models as evaluators through Fiddler’s bring-your-own-judge functionality.

Fiddler supports AI governance and enterprise deployment through policy enforcement, role-based access control, SSO, auditability, and flexible deployment options including SaaS, VPC, and on-premise environments. Its platform is designed for engineering, IT, risk, compliance, and data-science teams that need to operate AI systems safely and reliably at enterprise scale.

Fiddler helps organizations move beyond basic AI monitoring toward continuous evaluation, security, and governance of production AI systems. Whether monitoring LLM applications, RAG systems, AI agents, or traditional machine-learning models, Fiddler provides tools for improving performance while controlling security, compliance, and operational risks. In January 2026, Fiddler announced a $30 million Series C and described its goal of becoming a neutral control plane for compound AI systems.