In January 2025, the AI industry experienced a significant shift when DeepSeek R1, an open-source model, rapidly gained popularity, challenging OpenAI's proprietary O1 model and impacting Nvidia's market valuation. DeepSeek R1 offers full transparency, allowing users to self-host and inspect model weights, which appeals to those seeking control and cost efficiency, particularly in high-volume workloads. In contrast, OpenAI's O1 provides a managed API service that emphasizes consistent performance and ease of deployment, especially appealing to those prioritizing rapid production and enterprise support. While DeepSeek R1 is cost-effective and offers customization, it requires substantial DevOps expertise; O1, though more expensive, provides a polished ecosystem with built-in compliance and scalability. Ultimately, the choice between these models depends on the user's need for control and cost savings versus convenience and production readiness, with each offering distinct advantages in different scenarios.