After nearly two decades of legal work at companies including Amazon, Cruise, Anki, and Replit, Cecilia Ziniti transformed her experience as a general counsel into a startup called GC AI, which develops artificial intelligence tools for corporate legal departments. Ziniti says the company currently serves approximately 2,100 companies, compared with about 900 companies a year ago, while its activity has grown 400% year over year.
GC AI was founded in San Mateo, California, after Ziniti left Replit on November 1, 2023, with the company incorporated about a week later. The immediate impetus was her early experience with GPT models during Replit’s collaboration with OpenAI in late 2021 and early 2022, before ChatGPT was made available to the public.
From User Experience to Product Requirements
While teaching courses on using ChatGPT in legal work, Ziniti noticed a gap between the answers provided by general-purpose models and what lawyers actually need. In a research example concerning the legal requirements for entering the Brazilian market, the model provided relevant points, but began with an unprofessional reference to visiting Rio and riding surfboards.
This experience led Ziniti to establish stricter product requirements: providing accurate citations, showing where the evidence appears within the document, and maintaining a tone appropriate for legal work. She then partnered with Bardia Pourvakil, an engineer she had worked with at Replit, to build the company. While Pourvakil brought technical expertise, Ziniti was a typical user of the target product: someone working in an in-house legal department.
What Does GC AI Offer?
The company began with an artificial intelligence assistant for legal departments, then added tools for contract analysis and managing requests directed to legal teams. Its revenue model is based on per-user subscriptions, along with additional products, including contract analysis, which is priced according to document volume.
Its customer base includes large companies and startups with a single in-house lawyer, including Lockheed Martin, Time, Eventbrite, Vercel, and Gusto. Ziniti says that approximately 30% of the seats used in GC AI belong to employees outside legal departments, such as human resources and finance personnel.
Trust and Data Protection at the Heart of the Competition
GC AI competes with Harvey and Legora, but Ziniti distinguishes between their customer segments: the other two companies initially focused on law firms, while GC AI targets companies and their in-house legal teams. The contract analysis tool was also designed to work on the company’s own documents, rather than across a broad range of files belonging to multiple clients, as may occur with law-firm tools.
The company says that approximately one-third of its 125 employees are lawyers. It also began pursuing compliance with the SOC 2 standard, developed controls for data isolation, and says it does not train its models on clients’ confidential information.
certi.news Analysis
The story of GC AI reveals a different path to founding artificial intelligence companies: identifying a precise professional problem from within the field, then partnering with someone who possesses engineering expertise. The practical change here is not merely adding a chatbot to legal work, but attempting to turn requirements such as verifiability, the source of an answer, and drafting tone into product features suitable for institutional use.
GC AI has raised nearly $72 million across three rounds. Its latest round was a $60 million Series B led by Scale Venture Partners and Northzone, at a company valuation of $555 million, with participation from Sound Ventures, Aglaé Ventures, SilverCircle Partners, News Corp, and The Council. These figures, along with the growth rates and customer numbers, are based in the article on statements by Ziniti, while the company’s ability to maintain trust and accuracy as usage expands remains an open question.