Together AI

Together AI is a private American technology company specializing in cloud-based infrastructure and tools for training, fine-tuning, deploying, and running generative artificial intelligence models. Founded in 2022 by Vipul Ved Prakash, Ce Zhang, Chris Ré, and Percy Liang, the company is headquartered in San Francisco, California. Together AI's platform offers GPU-based compute resources and supports a range of open-source models across multiple modalities, including text, image, audio, vision, and code. The platform includes APIs that allow developers to run inference and integrate models into applications without managing physical hardware. Additionally, Together AI provides tools for model customization, dataset management, and deployment workflows, enabling models to be developed, tested, and deployed within a single cloud environment.

In April 2023, Together AI launched RedPajama, an open-source initiative to reproduce and distribute a large-scale training dataset intended as an alternative to Meta’s Llama dataset. The initial release comprised approximately 1.2 trillion tokens and was designed to support the development of open-source large language models. In December 2024, the company acquired CodeSandbox, an Amsterdam-based provider of cloud development environments, expanding its engineering and research presence in Europe. In 2025, Together AI announced a major expansion into Europe through a strategic infrastructure partnership with Hypertec and 5C Group, deploying up to 2 gigawatts of AI-dedicated data center capacity and nearly 100,000 NVIDIA GPUs across several European countries, including France, the United Kingdom, Italy, and Portugal.

As of June 2026, Together AI has raised a total of $534 million in funding, including a $305 million Series B round in February 2025, valuing the company at $3.3 billion. The funding was led by General Catalyst and co-led by Prosperity7 Ventures, with participation from Salesforce Ventures, Nvidia, Kleiner Perkins, and Coatue. The company serves over 450,000 developers and supports more than 200 open-source models. Notable customers include Zoom and Salesforce, and the company maintains partnerships with organizations such as VAST, WEKA, 5C Group, and NVIDIA. Together AI's main competitors include major cloud providers like Amazon Web Services, Microsoft Azure, and Google Cloud, as well as other AI infrastructure companies.

In 2024, Together AI was recognized in Forbes' AI 50 list, highlighting its significant impact in the AI industry. The company's commitment to open-source AI technology and its substantial infrastructure investments have positioned it as a key player in the AI infrastructure sector.