Together AI launches Post-Training service for custom models

Together AI on 2026-10-19 introduced Together Post-Training, a service aimed at helping developers build custom models using reinforcement learning and supervised fine-tuning while the company manages the underlying infrastructure, according to the company’s blog post published that day. The launch is positioned as a way to let users define their own training loops while Together handles the GPU systems underneath, including Model Resources, Training Sessions, Trainer instances and Generator instances, the company said. Together said the service supports LoRA training, multiple LoRA adapters sharing the same GPU capacity, and full-weight experiments for selected models, while also allowing asynchronous RL and custom training objectives.

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