# Humanloop **Source:** https://geo.sig.ai/brands/humanloop **Vertical:** Developer Tools **Subcategory:** General **Tier:** Emerging **Website:** humanloop.com **Last Updated:** 2026-04-15 ## Summary London LLM evaluation and prompt management platform (Gusto, Vanta, Duolingo customers) acquired by Anthropic 2024; YC W20 $7.9M Index Ventures-backed bringing production AI evaluation expertise to Anthropic's Claude development. ## Company Overview Humanloop is a London, UK-based AI model evaluation and LLM observability platform — backed by Y Combinator (W20) with $7.9 million raised including a $5 million seed plus round in November 2023 led by Y Combinator with participation from Index Ventures and UCL Technology Fund — that joined Anthropic in 2024 to help build the AI evaluation and safety infrastructure that enables responsible development of AI systems. Founded in 2020 by Raza Habib, Jordan Burgess, and Peter Hayes, Humanloop served enterprise AI development teams at Gusto, Vanta, and Duolingo with prompt management, LLM evaluation frameworks, and production monitoring tools that help engineering teams systematically improve AI product quality and catch regressions when model versions change. The acquisition by Anthropic represents a talent and technology integration into the team building Claude and Anthropic's enterprise AI products. Humanloop's platform addressed the critical tooling gap that AI engineering teams face when moving AI features from prototype to production: LLM applications (customer service bots, code assistants, document analysis tools) can silently degrade in quality when the underlying model is updated, when input distribution shifts, or when prompt changes produce unexpected outputs — and without systematic evaluation, these quality regressions go undetected until customers complain. Humanloop provided the evaluation harness (defining test cases with expected outputs, running the LLM pipeline against the test suite, and comparing quality metrics across versions), prompt management (version-controlling prompt templates with rollback capability), and production observability (logging LLM inputs, outputs, and user feedback in structured form for quality analysis). The focus on 'AI evaluation' as a distinct engineering discipline — with the rigor applied to software testing transferred to measuring AI output quality — was Humanloop's core product thesis. Humanloop's 2024 joining of Anthropic represents a significant development in the AI safety and evaluation space: Anthropic (the AI safety company behind the Claude model family) acquired Humanloop's team and technology specifically to strengthen Anthropic's evaluation infrastructure for Claude's ongoing development. This reflects the broader AI industry recognition that model evaluation — creating comprehensive test suites that reliably measure AI capability, safety, and alignment — is one of the hardest technical problems in AI development. Humanloop's production-tested experience building evaluation systems for LLM applications at enterprise customers (Gusto, Vanta, Duolingo) brought real-world evaluation methodology to Anthropic's research environment. The YC W20 cohort connection (Humanloop, like many YC companies, built tools with strong product-market fit in the developer tools space before the acquisition). ## Frequently Asked Questions ### What is Humanloop? Humanloop is an enterprise-grade AI evaluation platform that provides prompt management and LLM observability tools for development teams. Founded in 2020 and backed by Y Combinator (W20), the London-based company serves clients including Gusto, Vanta, and Duolingo. ### What products and services does Humanloop offer? Humanloop offers an LLM evaluation platform, prompt management tools, LLM observability solutions, AI model testing capabilities, and a prompt engineering platform. These tools are designed to help development teams manage and evaluate large language models. ### Who are Humanloop's target customers? Humanloop serves development teams at enterprise companies, with notable customers including Gusto, Vanta, and Duolingo. The platform is designed for organizations building and deploying AI applications using large language models. ### When was Humanloop founded and by whom? Humanloop was founded in 2020 by Raza Habib, Jordan Burgess, and Peter Hayes. The company was part of Y Combinator's Winter 2020 batch (W20). ### Where is Humanloop located? Humanloop is based in London, United Kingdom. ### How much funding has Humanloop raised? Humanloop has raised $7.9M in total funding, including a $5M seed plus round in November 2023 led by Y Combinator. Other investors include Index Ventures, Y Combinator, and the UCL Technology Fund. ### What notable companies use Humanloop? Humanloop's customer base includes prominent companies such as Gusto, Vanta, and Duolingo. These organizations use Humanloop's enterprise-grade platform for AI evaluation and LLM management. ### What makes Humanloop's approach unique? Humanloop offers an enterprise-grade platform combining best-in-class prompt management with LLM observability and evaluation capabilities. This comprehensive approach allows development teams to manage, test, and monitor large language model applications in one platform. ### How can I get started with Humanloop? Based on the provided information, specific onboarding details are not available. Humanloop serves enterprise development teams and offers developer tools for AI evaluation and prompt management. ### What recent developments has Humanloop announced? In a significant recent development, Humanloop announced it is joining Anthropic to help build an AI future that benefits everyone. This follows their $5M seed plus funding round completed in November 2023. ## Tags b2b, developer-tools, platform, saas, startup --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-15.*