Together AI Raises $800M Series C at $8.3B Valuation

REDWOOD CITY, Calif.: Together AI closes an $800 million Series C at an $8.3 billion post-money valuation.

Aramco Ventures leads. Vista Equity, General Catalyst, Emergence, Nvidia, Salesforce Ventures, March Capital, Pegatron Ventures, and SentinelOne S-Ventures join. Total funding now passes $978 million.

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The company runs infrastructure for training and serving open-source AI models. Enterprises use it to avoid locking into proprietary APIs from OpenAI, Anthropic, or Google. Together handles the compute orchestration, fine-tuning, and inference underneath.

The thesis has stopped being contrarian. Open-weight models from Meta, Mistral, DeepSeek, and Moonshot now hold their own against closed rivals on quality. Meituan just open-sourced LongCat-2.0, a 1.6 trillion-parameter coding model trained entirely on Chinese chips. Customers running open models report inference bills around 30% of closed-source API pricing. Baseten is chasing a $13 billion valuation on the same wave.

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The lead investor is worth pausing on. Aramco Ventures is Saudi Arabia’s corporate venture arm, and its check extends a run of Gulf sovereign capital moving into AI compute. Nvidia’s participation continues its habit of investing up and down the inference stack it also supplies.

The context is a record half-year. Crunchbase counts $510 billion in global venture funding for H1 2026. More than 70% of second-quarter capital went to AI companies, and most of that pooled at the model layer. Infrastructure players like Together compete for what’s left, which is still an enormous number.

The money goes toward GPU capacity, enterprise features, and tooling for agentic workloads on open models. Together rents compute across roughly 20 cloud providers to serve its customers.