The development of AI models has led to a seismic shift in platform technology, with open-source AI becoming increasingly ubiquitous and desirable. This shift is driven by the flexibility and cost-effectiveness of open-source models, which offer greater adaptability and lower costs compared to proprietary alternatives. The frontier for AI is rapidly expanding, with open-source models claiming numerous breakthroughs and holding multiple superlatives in the ecosystem. However, proprietary models are still advancing in areas such as reasoning and multimodality, but the gaps between them and open-source models are shrinking. To harness the power of open-source AI, a new kind of cloud platform is needed, which Together AI aims to provide by normalizing variability, providing adaptable abstractions, and adopting the latest AI-native infrastructure. As the demand for open-source AI continues to grow, companies like Salesforce, Zoom, and SK Telecom are already joining forces with Together AI, and developers are taking note of its potential.