Together AI builds open-source LLM infrastructure and APIs for developers to run and fine-tune large language models.
$800MSeries C
Investor undisclosed
An $800M Series C for LLM infrastructure in mid-2026 signals that open-source model serving has moved from nice-to-have to essential—likely driven by enterprises wanting inference cost parity with closed APIs without vendor lock-in. Together is probably using this to scale compute capacity, build out managed services, and compete directly with Anthropic/OpenAI on latency and pricing. If you're building any AI product that needs custom models or cost-sensitive inference, this validates that the infrastructure layer is consolidating fast—you'll want to lock in pricing/partnerships now before the winners emerge.