In a remarkable demonstration of human-AI collaboration, Belgian software developer Bernard Lambeau has introduced a new programming language named Elo, developed in partnership with Claude Code from Anthropic. This innovative project began on December 25, 2025, when Lambeau published a series of posts detailing their collaborative journey.
In just about 24 hours of joint effort, Lambeau and Claude managed to construct a comprehensive expression language, complete with a parser, type system, three compilers, a standard library, a command-line interface (CLI) tool, and a documentation website. “Not bad for a day’s work,” they remarked, emphasizing that Elo exemplifies not only AI’s coding capabilities but also the synergy achievable when humans and AI work together.
Features and Purpose of Elo
Elo is designed as an expression language that compiles to JavaScript, Ruby, and SQL. Its primary applications include form validation, e-commerce order processing, and subscription logic. Lambeau, who is the founder and CTO of Klaro Cards and CEO of app consultancy Enspirit, noted that Elo is part of a broader trend where developers leverage AI to create programming languages. Previous examples include the Rue language by Steve Klabnik and Cursed by Geoffrey Huntley.
The Role of Claude Code
Lambeau described Claude as a powerful tool that enhances his capabilities as a developer. He stated, “Claude Code knows almost every tech stack… and does that 10x faster than I can do myself.” This partnership allows Lambeau to engage with technologies he has yet to master, effectively transforming him from a full-stack developer to a full-stack++ developer.
Despite its strengths, Lambeau acknowledged that Claude requires a solid methodology to function effectively. He emphasized the importance of feedback loops, where human oversight plays a crucial role in ensuring code quality. Lambeau has documented over 100 tasks that guided Claude throughout the development process, and he has shared a video detailing his AI pair programming approach.
Future Aspirations and Accessibility
Lambeau envisions Elo as more than a mere experiment; he sees it as a continuation of his academic work in software engineering. He believes that programming languages need to be safer and simpler, especially for non-experts. Elo aims to provide a user-friendly alternative, focusing on common data use cases while maintaining safety and simplicity.
In terms of cost, Lambeau reported that his subscription to Claude Max, which he acquired in December for €180 a month, significantly accelerated his development process. He completed multiple projects in a fraction of the time it would have taken manually or with another developer.
Ultimately, Lambeau’s work with Elo highlights the evolving landscape of software development, where AI tools like Claude Code serve as amplifiers of human expertise rather than replacements. As the integration of AI into programming continues to grow, Elo stands as a testament to the potential of collaborative innovation.
This article was produced by NeonPulse.today using human and AI-assisted editorial processes, based on publicly available information. Content may be edited for clarity and style.
