Together AI

Together AI is an AI cloud platform headquartered in San Francisco, California, that specialises in inference, fine-tuning, and deployment of open-source and custom AI models at scale. The company has raised $533.5 million in total funding from investors including NVIDIA, Salesforce Ventures, General Catalyst, Kleiner Perkins, Coatue Management, and Lux Capital, with a prospective valuation of $7.5 billion—more than double its previous mark—as investors negotiated a billion-dollar funding infusion in 2026.

Annualised revenue is estimated near $1 billion, tripling since mid-2025. Together AI provides a serverless inference API supporting more than 200 open-source models including Llama, Mistral, DeepSeek, and Qwen, alongside dedicated fine-tuning infrastructure for teams training custom models on proprietary datasets.

Its compute platform gives developers access to NVIDIA H100 and H200 GPU clusters without the overhead of managing infrastructure, with per-token pricing for inference and per-GPU-hour pricing for training. Key differentiators include industry-leading inference speed (Together AI claims top throughput benchmarks on Llama models), model library breadth, and built-in support for RLHF and LoRA fine-tuning workflows.

The platform is widely used by AI startups, enterprise engineering teams, and researchers who want the capability of frontier open-source models without the capital expense of building their own GPU infrastructure. Together AI also publishes open research on efficient inference architectures and model quantisation techniques.