LemmaBase launches open-source language that makes AI reliable
While tech giants bet on closed systems and unpredictable AI models, the Dutch startup LemmaBase is launching the open-source language Lemma. With it, they offer governments and businesses what artificial intelligence cannot deliver: absolute reliability and transparency in legislation, business processes, and product terms.
AMSTERDAM, August 10, 2026
With the launch of the open-source language Lemma, Dutch startup LemmaBase is taking a concrete step to tackle the power of Big Tech and the risks of unpredictable AI. This new standard allows governments and companies to record laws, rules, and policies in a transparent and verifiable way.
The startup offers a direct response to the growing dependence on opaque algorithms and AI systems that threaten the autonomy of governments and businesses. According to LemmaBase, society is at risk when decisions on financial legitimacy, allowances, permits, or credits are left to systems that cannot be controlled or managed.
Lemma solves this by applying the rules as code principle to AI. The new language makes it possible to write legislation and regulations in a way that is easy for humans to understand and executed by computers with absolute certainty. It shows what logic is applied, why a specific outcome is reached, and how rules change over time.
These kinds of guarantees are important in sectors where mistakes are not an option. In the financial sector, for example, an AI assistant can handle the interaction during a mortgage or credit application, while Lemma ensures that borrowing capacity is calculated according to the current standards. The government can embed tax logic or allowance criteria in Lemma, making decisions explainable and ruling out arbitrariness. Municipalities can use it to check complex zoning plans for permit applications, resulting in faster and legally sound decisions, while health insurers and logistics providers can use the language to guarantee flawless health reimbursements and international customs rules, respectively.
The launch of Lemma ties into a broader trend where the focus is shifting from AI capabilities to AI governance. While the technology has mainly been used for generative tasks in recent years, there is a growing demand for systems that offer firm guarantees. Decoupling decision logic from operational systems gives organizations a way to innovate without losing control.
The language's specification and source code are now available on GitHub and Lemma.run.