Together AI Raises $305M Series B to Power AI Model Training and Inference

SAN FRANCISCO, Feb. 20, 2025 — Together AI today announced a $305 million Series B investment led by General Catalyst and co-led by Prosperity7. The round saw participation from a distinguished group of global institutional and strategic investors including Salesforce Ventures, DAMAC Capital, NVIDIA, Kleiner Perkins, March Capital, Emergence Capital, Lux Capital, SE Ventures, Greycroft, Coatue, Definition, Cadenza Ventures, Long Journey Ventures, Brave Capital, Scott Banister, and technology pioneer John Chambers.

The funding round, which values the company at $3.3 billion, arrives as Together AI unveils plans for an expansion of its AI Acceleration Cloud, with plans for large deployment of NVIDIA Blackwell GPUs. Together AI’s enterprise-grade inference and fine-tuning capabilities have already improved how over 450,000 AI developers, AI-native companies, and global enterprises build modern AI applications.

“AI is transforming every industry, creating unprecedented efficiencies and enabling entirely new classes of products.,” said Together AI CEO Vipul Ved Prakash. “We have built a cloud company for this AI-first world — combining state-of-the-art open source models and high performance infrastructure, with frontier research in AI efficiency and scalability. Our AI Acceleration Cloud uniquely provides organizations with the performance, security, and functionality required to train frontier models and build production-scale AI applications with incredible cost efficiency. With this investment, we will accelerate our mission to make open source AI accessible for AI developers and customers globally.”

Together AI’s platform uniquely spans the entire AI lifecycle, delivering enterprise-grade inference solutions; training and fine-tuning for frontier foundational models; agentic workflows with built-in code interpretation; and synthetic data generation. It enables organizations to build complete AI applications with the performance, security, accuracy, and model ownership that enterprises demand.

Supporting over 200 open source models across all modalities — chat, image, audio, vision, code, and embeddings — the platform is powered by Together AI’s proprietary Inference engine and built on research innovations including FlashAttention-3 kernels and advanced quantization techniques. It delivers 2-3x faster inference than today’s hyperscaler solutions.

The company continues to reshape the AI infrastructure landscape with 200 MW of secured power capacity and is deploying optimized clusters of NVIDIA Blackwell GPUs across multiple data centers in North America. Together AI’s partnership with Hypertec to co-build a cluster of 36,000 NVIDIA GB200 NVL72 GPUs further cements its position at the forefront of AI Cloud providers.

At the heart of this infrastructure lies the Together Kernel Collection, a breakthrough in AI system optimization developed under the leadership of Chief Scientist Tri Dao, creator of FlashAttention. This proprietary technology stack delivers 24% faster training operations while significantly reducing costs for customers like Pika Labs.

“Recent developments in open source AI illustrate the importance of Together AI’s work in making access to models like these secure, accessible, and powerful for organizations here in the U.S. and around the world,” said Prosperity7 Ventures Managing Director Abhishek Shukla. “Together AI’s ability to do this while accelerating the process, increasing efficiencies and reducing costs makes Together AI an exceptional resource for even large, global businesses.”

Together AI’s research lab continues to discover new scientific methods at the intersection of AI and systems research, with open source contributions like Mixture of Agents, Medusa, Sequoia, Hyena, and Mamba driving innovation across the industry.

About Together AI

Together AI empowers developers and enterprises to train, fine-tune and run inference for generative AI models — delivering unparalleled performance, control, and cost-efficiency. The Together AI Platform supports a comprehensive range of top open source and custom models across multiple modalities, while offering flexible deployment options with the highest levels of privacy and security. Committed to advancing the frontier of AI through open collaboration, innovation and transparency, Together AI ensures that powerful AI systems remain accessible and flexible while creating optimal outcomes for society.

Source: Together AI