While initially focused on its API, Anthropic's direct-to-consumer products like Claude Code have become a massive growth engine, challenging the assumption that AI labs should only build platforms for others to use.

Anthropic dominated the crucial developer market by strategically focusing on coding, believing it to be the best predictor of a model's overall reasoning abilities. This targeted approach allowed their Claude models to consistently excel in this vertical, making agentic coding the breakout AI use case of the year and building an incredibly loyal developer following.

The development of Claude Cowork demonstrates a massive acceleration in product velocity. The entire application was written by its underlying AI agent, Claude Code, in just a week and a half. This showcases how AI-driven coding is collapsing development cycles for new software products.

The success of Anthropic's coding agent, Claude Code, was a "mile marker" moment, causing major labs like OpenAI to abruptly cut "side quests" and refocus on the lucrative enterprise market with powerful, agentic AI.

Contrary to the popular narrative of OpenAI's dominance, analysis suggests Anthropic's quarterly ARR additions have already overtaken OpenAI's. The rapid, viral adoption of Claude Code is seen as the primary driver, positioning Anthropic to dramatically outgrow its main rival, with growth constrained only by compute availability.

Anthropic's destiny was fundamentally changed by Claude Code, a developer tool that started as a side project. Its massive success, generating $2.5B in ARR and becoming the primary use case for Anthropic's models, demonstrates that the most powerful and immediate application of AI is creating and improving the software that powers the world.

The idea of AI improving itself is already a reality at Anthropic. Over 90% of their internal code, including code for the Claude Code tool itself, is written by AI. This internal use of their own frontier models is a key driver of their accelerating development pace.

Cowork, a polished product from a major AI lab, was developed in just over a week using Claude Code itself. This is a major proof point that AI-assisted "vibe coding" is no longer just for prototypes but is a viable method for achieving extreme product velocity on production-grade software.

The now-massive Claude Code tool was not an instant success. After its public release, it took many months for the broader user base to understand its value and for adoption to accelerate, showing that even revolutionary products can have a slow burn.