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Thirdlayer (YC W25) — Continual learning for enterprise AI

Thirdlayer appears in Y Combinator's company directory in the Winter 2025 batch, listed 2025-01-18. Continual learning for enterprise AI.

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Thirdlayer: Accepted into Y Combinator Winter 2025

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Thirdlayer

New accelerator entry · 2025-01-18 · the record

Winter 2025
batch
2
people
Early
stage
United States of America
region
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In their words

ThirdLayer is the learning and alignment layer for enterprise AI. We continuously ingest and structure messy organizational context, complex operational processes, and siloed, permission-sensitive data, then grade agents against the outcomes each company cares about. Every interaction becomes feedback that helps agents improve over time. Companies use ThirdLayer to power their internal agents or embed it into the AI products they’re building. We give agents the context, evaluations, and learning loops they need to stay aligned with each organization and deliver better outcomes with every run.

What the record says

BatchWinter 2025
Announced2025-01-18
StageEarly
StatusActive
Team size2
IndustryB2B
Sub-industryB2B -> Productivity
SectorsArtificial Intelligence, Productivity, Consumer Products, AI
RegionsUnited States of America, America / Canada
BasedSan Francisco, CA, USA
HiringYes
Sitehttps://thirdlayer.inc
Previously known asDexterity, Dex, Dexterity AI, Dexterity, Dex, ThirdLayer, Dex

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If you're behind Thirdlayer: acceptance into a YC batch is one of the few weeks a young company gets looked up by people who matter — investors, other founders, press. FoxPlug turns the commits, deploys, and releases you're already making into that story automatically, so anyone who looks finds something current. FoxChat puts a guide on your own site so the people YC's own page just sent you don't read one line and leave.

Sourced from the company's Y Combinator directory entry.

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Permanent URL: https://mentionfox.com/funding/yc-thirdlayer
Last updated 2026-09-26
Primary record: Y Combinator directory entry
Thirdlayer (YC W25) — Continual learning for enterprise AI. MentionFox, 2026-09-26. https://mentionfox.com/funding/yc-thirdlayer