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Lemma

Reliability platform for AI agents

Y CombinatorFall 2025ActiveB2BEngineering, Product and DesignArtificial IntelligenceDeveloper ToolsB2BInfrastructure

What they do

Problem

AI agents can appear to complete tasks while silently failing semantically, making issues hard to detect and debug before users notice.

Solution

Lemma is a reliability and observability platform that scans AI agent traces to detect semantic failures, pinpoint root causes, and guide fixes to improve agent performance over time.

Who it's for

Developers and teams building and operating AI agents, especially in organizations running agents in production.

Founders

Jerry Zhang
Founder

Co-founder @ Lemma (YC F25) | Reliability platform for AI agents

Cole Gawin
Founder

developing the next generation of intelligent systems @ lemma (f25) | ex-USC

Company timeline

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