Together AI

Cloud for running and fine-tuning open-source models

Overview

Together AI operates a cloud for inference, fine-tuning and training of open-source models, sold through an API and dedicated GPU clusters. On 20 February 2025 it announced a US$305 million Series B led by General Catalyst and co-led by Prosperity7, at a valuation of US$3.3 billion[55]. In October 2026 it expanded its enterprise inference capacity with a dedicated B300 cluster with IBM Cloud and NVIDIA, and it has partnered with Y Combinator on a GPU cluster for YC companies[55]. Together has not published revenue. Its valuation is the oldest in this tier, and it competes on price with hyperscalers and with model developers that host their own open models.

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