Boris Cherny: How We Built Claude Code

Building the Future: Inside the Evolution of Claude Code. Imagine a world where coding as we know it is rapidly dissolving, replaced by a new era of AI-powered development that feels less like work and more like creative play. This is the story behind Claude Code—a tool born from relentless iteration, user obsession, and a drive to build not for the present, but for the capabilities just over the horizon. From its inception, the philosophy was to anticipate what large language models would soon be able to do, not just what they could handle today. Everything about Claude Code has been rewritten countless times—no piece of its codebase is older than a few months. The approach? Ship quickly, hand prototypes to users, gather feedback, and adapt. Sometimes, a promising idea fizzles; other times, it accidentally transforms how people create. The first version emerged as a humble, terminal-based chat app—a practical choice for a solo developer who didn't want to build a full UI. But this constraint became a catalyst: the simplicity and focus of the terminal unlocked new kinds of developer experiences. Suddenly, coding didn't feel like work. Developers could automate tasks, orchestrate complex workflows, and even enjoy the process of debugging—previously a dreaded chore. What made Claude Code special wasn't just its technical muscle. It was its ability to respond to what users were already trying to do, a concept called “latent demand.” Rather than forcing people into new paradigms, it eased their existing workflows, amplifying what they wanted to achieve. As models improved, the scaffolding built around them could be stripped away, making the tool ever more streamlined. Feedback drove evolution. When users wanted more control, verbosity toggles appeared. When model capabilities leaped forward, old hacks and workarounds were deleted. New principles emerged for building in this new era: think like a scientist, approach problems with humility, and be willing to discard your strongest opinions as the model's abilities change. The culture that grew around Claude Code prizes generalists—people who blend product sense, design, and engineering, and who aren't afraid to experiment or be wrong. Tools like Claude Code don't just empower engineers; they turn everyone—designers, product managers, even finance professionals—into builders. The most striking change is the pace. Productivity has soared, with engineers now able to ship and iterate at breathtaking speed. Codebases are in constant flux, and the shelf life of any given feature might be just a few months. The “bitter lesson” learned: never bet against the model. What seems impossible today may be trivial tomorrow. Looking ahead, the vision is even more radical. Coding, as a specialized skill, is fading into the background. The boundaries between roles are blurring. Teams collaborate through swarms of agents, each tackling problems in parallel, guided by context and user intent. The interface is evolving beyond the terminal to web, desktop, and mobile, always searching for the next leap in usability. Underpinning it all is a deep commitment to safety and mission. Every conversation, every feature, is filtered through the lens of responsibility—what happens as AI becomes self-improving, or if it's misused? This tension between excitement and caution defines the ethos. Claude Code began as a scrappy experiment, but it's become something much larger: a glimpse into a near future where creation is democratized, boundaries are dissolved, and the act of building becomes accessible—and joyous—for everyone.