
What happened
Together AI, an infrastructure company for running open-source AI models, closed an $800 million(約1300億円) Series C funding round led by Aramco Ventures. The company's annual bookings crossed $1.15 billion(約1800億円) last quarter, and it now serves thousands of paying customers including Cursor, Cognition, and Decagon.
Why it matters
Businesses using closed AI models face high costs that can consume their entire profit margin. Together AI offers an alternative by helping companies run open models like DeepSeek and Nemotron at a fraction of the cost—customers report cost savings of 6x to 60x compared to closed-model pricing for equal or better performance. Nearly three-quarters of organizations expect to increase their use of open-source AI, suggesting demand for affordable infrastructure continues to grow.
What to watch
Open-source model usage across the industry has tripled in twelve months. The company positions itself as the platform making open-source models genuinely usable at enterprise scale, serving many of the biggest names in AI.
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