Organisation · company · US

Together AI

A cloud platform for running and fine-tuning open-weight models across a large catalogue, positioned as infrastructure for the open ecosystem.

4 entries · April 2023 – February 2025

Together AI is a US cloud company that provides infrastructure for running and fine-tuning open-weight models, positioning itself as a platform for the open ecosystem rather than a builder of frontier models of its own. It first drew notice in 2023 with RedPajama, an effort to reproduce the training data behind Meta's LLaMA and release it without the licence restrictions that limited the original. Its business is inference and training across hundreds of open models, and it has raised large sums — a $305 million round in early 2025 valued it at $3.3 billion — to expand its GPU capacity. Demand for that infrastructure grew alongside interest in open-weight models as a cost-competitive alternative to closed frontier labs, particularly after DeepSeek's R1 release.

Category
Open source & ecosystem
Founded
2022
HQ
San Francisco, US
Funding
~$3.3bn valuation (2025 Series B); ~$1.33bn raised, backers include Nvidia and General Catalyst
Key people
Vipul Ved Prakash, Tri Dao

Appears alongside

Featured in threads

Tracks

  • Open weights & ecosystem 4
  • Money & business 2
  • Models & capabilities 1

  1. Together AI raises $305m Series B

    General Catalyst and Prosperity7 led the round at a $3.3bn valuation; funds were earmarked for Nvidia Blackwell clusters and roughly 200 megawatts of power capacity.

    Money & business · Open weights & ecosystem

  2. Together AI raises $102.5m Series A

    Together AI raised a $102.5m Series A led by Kleiner Perkins with NVIDIA participating, valuing the open-model cloud provider at roughly $500m.

    Money & business · Open weights & ecosystem

  3. Together AI releases RedPajama-7B models

    Base, instruct and chat variants trained on a fully published 1-trillion-token dataset, with the instruct model reported to beat Falcon-7B and MPT-7B on the HELM benchmark suite.

    Open weights & ecosystem · Models & capabilities

  4. Together AI launches RedPajama to reproduce LLaMA's training data

    Unlike LLaMA, restricted to non-commercial research, the reproduced 1.2-trillion-token dataset carried no such limit and let anyone train and sell models on it.

    Open weights & ecosystem

Also mentioned in 1 entry

Referenced in passing — Together AI isn't the main subject of these.