Together AI is a cloud platform for running, fine-tuning and training open-source AI models, reached through an API that works like OpenAI's.
In plain words
Many strong models are open, but running them needs expensive GPUs. Together AI hosts them so you can call them on demand, fine-tune them from your own training loop, or rent GPU clusters for bigger training jobs. Because its API follows OpenAI's format, the OpenAI software kit can point at it with a different address.
A quick example
Imagine a team already using the OpenAI SDK that wants to try an open model. They change the base address and API key, pick an open model name, and send the same chat request as before.
Where you'll meet it
- Serving open-weight models without owning GPUs.
- Fine-tuning open models.
Related
Sources
- DocsOverview, Together AI · read 5 Nov 2026
- DocsQuickstart, Together AI · read 4 Nov 2026
Checked by WhatIsAI against the sources above · 5 Nov 2026. Spotted an error? Report it.