Lemma was founded by Jerry Zhang, Cole Gawin in 2025.

Who are Lemma's investors?

Lemma's investors include Eight Capital, Irregular Expressions, Lyra Capital Pty Ltd, Vermilion Cliffs Ventures, Y Combinator, Adapt Ventures, Cervin, Comma Capital and 8 more.

Where is Lemma headquartered?

Lemma is headquartered in San Francisco, US.

Lemma

YC F25

San Francisco, US · Founded 2025 · 2 employees · Hiring · 16 known investors

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Lemma provides production monitoring and observability for AI agents, surfacing failures, aggregating issues, and enabling quick resolution through integrated alerts and context-sharing tools.

Also known as Forge AI Labs, Inc.

AI & Machine Learning Developer Tools Enterprise Software Artificial Intelligence Analytics Infrastructure MonitoringUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (F25)

Lemma was founded in 2025 by Jerry Zhang and Cole Gawin.

Jerry Zhang CEOJerry Zhang is a co-founder of Lemma, an AI agents reliability platform supported by Y Combinator's F25 cohort.

Cole Gawin CTOCole Gawin attended USC and is building intelligent systems technology at Lemma, a startup in the Y Combinator F25 batch.

Investors · 16

Eight Capitallisted by Eight CapitalNorwalk

How we know: Y Combinator's founder network · eightcapital.com · Not right? Tell us

Irregular Expressionslisted by Irregular Expressions

How we know: Y Combinator's founder network · Not right? Tell us

Lyra Capital Pty Ltdlisted by Lyra Capital Pty LtdSydney

How we know: Lyra Capital Pty Ltd's portfolio page · Y Combinator's founder network · Not right? Tell us

Vermilion Cliffs Ventureslisted by Vermilion Cliffs VenturesNew York · $200K – $500Kvia Ashley Smith · inferred

How we know: Y Combinator's founder network · Not right? Tell us

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · open dataset · 5k.vc investor directory · Not right? Tell us

Adapt VenturesreportedNew York · $250K – $350K

How we know: open dataset · 5k.vc investor directory · Not right? Tell us

CervinreportedPalo Alto · $250K – $6M

How we know: Y Combinator's founder network · Not right? Tell us

Comma CapitalreportedNew York · $100K – $2M

How we know: Y Combinator's founder network · Not right? Tell us

Core91.vcreportedMumbai · $100K – $400K

How we know: open dataset · 5k.vc investor directory · Not right? Tell us

GreycroftreportedNew York · $100K – $5M

How we know: alleywatch.com · Not right? Tell us

HomebrewreportedBurlingame · $100K – $500K

How we know: alleywatch.com · Not right? Tell us

Index VenturesreportedSan Francisco · $540K – $10.8M

How we know: alleywatch.com · Not right? Tell us

Liquid VenturesreportedSan Francisco · $250K – $5M

How we know: Y Combinator's founder network · Not right? Tell us

MatrixreportedSan Francisco · $100K – $10M

How we know: Y Combinator's founder network · Not right? Tell us

Position VenturesreportedSan Francisco

How we know: Y Combinator's founder network · Not right? Tell us

Venture Investment AssociatesreportedPeapack

How we know: Y Combinator's founder network · Not right? Tell us

Funding

SEC filings, press & company announcements

Undisclosed amountSeedOct 2024
Index Ventures (lead), Greycroft, Homebrew
Source ↗

Source: company announcements and press reports — follow each round's link for the claim.

Related companies · 8

Agnost AIAgnost AI provides observability and failure detection for AI agents in production environments. The platform analyzes real production conversations from any LLM or framework to identify failures, extract patterns, and generate fixes that teams can implement, with support for intent detection, sentiment analysis, and automatic improvements.

Axiomatic_AIAxiomatic AI makes Lemma, an AI co-explorer for scientific and engineering work that helps users validate, derive, and analyze equations and reasoning across mathematics, physics, and engineering with reproducible Python-based modeling. It serves researchers and engineers, producing workspace artifacts such as Markdown notes, Python scripts, and Marimo notebooks.

The Context CompanyThe Context Company provides observability and monitoring software for AI agents, helping developers identify and fix user frustration, tool failures, and behavioral issues in agent systems. The platform integrates with popular AI frameworks and surfaces alerts on hallucinations, missed goals, and performance problems.

LumeLume built software to automate customer data integration for engineering teams, using AI to discover schemas, map data, validate quality, and generate code automatically. The company has closed operations.

highlight.ioA full-stack monitoring platform that helps developers identify performance issues and bugs in web applications through session replay and error tracking.

PareaParea provides testing, evaluation, and observability tools for large language model applications. The platform enables teams to track AI system performance, collect human feedback, manage prompts, and deploy LLM apps to production.

Thread AIThread AI provides AI orchestration infrastructure that enables organizations to deploy controlled and governed AI workflows and agents in regulated environments. The platform, Lemma, offers a workflow builder and composable infrastructure for safely operationalizing mission-critical AI processes with governance, control, and traceability guardrails.

VellumVellum builds AI development tools and platforms for teams building AI applications. The company focuses on helping customers navigate the rapidly evolving AI landscape through products and expertise.

Companies working in the same space as Lemma.

Legal entities · 1

corporate structure

Forge AI Labs, Inc.

In the news

Lemma: Continuous Learning for AI Agentsycombinator.com · Nov 2025

Lemma Funding: $1M | Complete Analysis | Extruct AIextruct.ai

Frequently asked questions

What does Lemma do?: Lemma provides production monitoring and observability for AI agents, surfacing failures, aggregating issues, and enabling quick resolution through integrated alerts and context-sharing tools.
Who founded Lemma?: Lemma was founded by Jerry Zhang, Cole Gawin in 2025.
Who are Lemma's investors?: Lemma's investors include Eight Capital, Irregular Expressions, Lyra Capital Pty Ltd, Vermilion Cliffs Ventures, Y Combinator, Adapt Ventures, Cervin, Comma Capital and 8 more.
Where is Lemma headquartered?: Lemma is headquartered in San Francisco, US.