By building a feature that competes directly with startups using its own API, Anthropic demonstrates the "platform risk" inherent in the AI ecosystem. Like Amazon with its Basics line, foundation model companies can observe usage, identify valuable applications, and integrate them, creating a kill-zone for dependent companies.

Building a business entirely on a closed-source API from a major provider like Anthropic or OpenAI is precarious. These platform companies can and do release new capabilities that directly compete with and subsume the functionalities of startups in their ecosystem, effectively erasing their business overnight.

Startups building on OpenAI or Anthropic APIs face a major platform risk. Their usage data trains the underlying foundational models, enabling the platform owners to eventually absorb their features natively and make the startups obsolete.

As major AI players like SpaceX/Cursor and Anthropic build closed ecosystems and change pricing, companies face significant vendor lock-in risk. An open IDE layer that supports multiple AI models becomes a strategic asset, allowing teams to avoid price hikes and switch to better models without overhauling workflows.

Anthropic is moving up the stack from model provider to application developer, putting it in direct competition with its own customers like Figma and Canva. It allegedly downplayed the capabilities of its new design tool to partners before launch, leading to broken trust and strategic fallout.

Cursor positions itself as a model-agnostic platform, turning potential competitors like OpenAI and Anthropic into partners. By being the "Snowflake for SDLC" on top of the "hyperscaler" models, they create a differentiated value layer focused on a vertical use case.

Cursor once constituted up to 50% of Anthropic's revenue, but Anthropic later competed directly by launching its own coding product. This illustrates the extreme danger for application-layer companies building on foundational models that can easily move up the stack and become competitors.

Startups are becoming wary of building on OpenAI's platform due to the significant risk of OpenAI launching competing applications (e.g., Sora for video), rendering their products obsolete. This "platform risk" is pushing developers toward neutral providers like Anthropic or open-source models to protect their businesses.

Startups building on top of AI models, like coding assistant Cursor, are extremely vulnerable. As foundation model companies like Anthropic improve their own native capabilities (e.g., Claude Code), they can quickly capture the market and render specialized tools obsolete.