Together AI bills itself as "The AI Native Cloud" - infrastructure built specifically for training and serving open-source language models at scale. The serverless inference API gives developers access to Llama, Mistral, Qwen, DeepSeek, FLUX, and other open-weight models through a single endpoint, with Together's proprietary FlashAttention and ATLAS optimizations delivering 2x faster inference at 60% lower cost compared to generic GPU providers. Beyond inference, Together offers a managed fine-tuning platform where teams can shape models on proprietary data using the latest RLHF and DPO techniques, plus dedicated GPU cluster rental for organizations that need sustained compute for research or production workloads. The platform handles the infrastructure complexity so ML teams can focus on the model work. For teams building AI products on open-source models, Together AI offers an alternative to AWS SageMaker and GCP Vertex that was designed for LLMs from the ground up rather than adapted from general-purpose compute services.