Simon Willison's update underscores a quiet but significant trend: the CLI tooling layer is becoming a critical battleground for AI developer mindshare. By baking in support for arbitrary OpenAI-compatible endpoints, the tool effectively commoditizes the API layer, making it easier for developers to swap between hosted giants like OpenAI and smaller, local, or specialized model providers. This move, while seemingly a minor feature addition, arguably nudges the ecosystem toward greater interoperability and could weaken the lock-in power of any single vendor's proprietary toolkit. The default model switch, meanwhile, serves as a real-time price-performance bulletin for the industry.