Overview Together AI is the production serving platform for open weight AI in 2026 — a cloud where developers run Llama 4, DeepSeek V3, Qwen 2.5, Mistral, Mixtral, FLUX image models, and roughly 200 other open weight models at per token prices that undercut every closed provider frontier API, with fine tuning, dedicated endpoints, and a serverless inference tier under one roof. If your production workload is built on open weights and cost matters, Together AI is probably on your shortlist alongside Groq and Fireworks. Founded in 2022 by Vipul Ved Prakash and a team of ex Apple and ex Stanford ML engineers, Together AI has grown into the second largest open weight inference host in the market and one of the most active contributors to open source AI infrastructure. The company publishes benchmark results transparently, invests heavily in inference kernel optimization (the FlashAttention, Sequoia, and Medusa work all traces back to Together affiliated researchers), and prices its API surface to reward heavy production usage rather than one off prototyping. The one line positioning: Together AI is the pick when open weight quality is enough and per token cost is the constraint — the broadest hosted open weight catalog with the deepest fine tuning and dedicated endpoint story in the category. It is not the absolute fastest (Groq wins on LPU throughput) and not the widest catalog (Hugging Face wins on model count), but the balance of catalog, price, latency, and customization is the strongest general purpose bet for production…