Modern AI systems require deep observability to maintain quality as they transition from testing to production, where nuances like prompt drift or API issues can erode performance unnoticed. Galileo and Braintrust offer distinct AI observability platforms that cater to different needs. Galileo provides an end-to-end reliability platform suitable for complex, multi-agent systems, integrating evaluation, monitoring, and runtime protection with features like multi-turn session metrics, real-time guardrails, and cost-effective evaluations using Luna-2 small language models. It is ideal for enterprises needing robust security and deep observability, especially in regulated industries. In contrast, Braintrust focuses on an evaluation-first workflow, suitable for straightforward LLM applications with fixed dashboards and webhook alerts, excelling in offline experimentation and quick deployment for teams prioritizing speed over comprehensive monitoring. The choice between these platforms depends on the complexity of the AI system, regulatory requirements, and specific organizational needs, with Galileo offering a more comprehensive solution for complex environments and Braintrust catering to simpler workflows.