Together AI
Together AI is an AI / GPU Cloud company founded in 2022 and based in San Francisco, United States. It has raised $1.3B in total funding, most recently a Series C in 2026 at a $8.3B valuation.
Together AI, founded in 2022 in San Francisco, operates an AI acceleration cloud for training, fine-tuning, and serving open-source models, with a serverless inference API spanning 200+ models and self-service GPU clusters on NVIDIA H100, H200, B200, and GB200 hardware. The founding team includes CEO Vipul Ved Prakash, CTO Ce Zhang, chief scientist Tri Dao, and Stanford researchers Chris Re and Percy Liang. The company differentiates on proprietary inference optimizations such as FlashAttention and custom kernels, and raised a $305 million Series B in February 2025 led by General Catalyst and Prosperity7 Ventures at a reported $3.3 billion valuation. In July 2026 it closed an $800 million Series C at an $8.3 billion valuation led by Aramco Ventures, with participation from Vista Equity Partners, General Catalyst, and NVIDIA, against an annualized revenue run-rate reported near $1 billion.
It is a leading open-model cloud that bundles fast inference, dedicated GPU clusters, and fine-tuning, giving developers an OpenAI-style stack for open-source models.
together.ai ↗·AI / GPU Cloud·
United States·private 
