# Together AI says the open model stack is becoming composable

> Original title: the open model stack is becoming composable

- Source: Together AI
- Published: 2026-10-27T16:02:55.000Z
- Bad Influence: https://badinfluence.news/items/fdpir909nsvcminc8jfssh59z
- Original: https://x.com/togethercompute/status/2115112012124406133

## Summary

Together AI says the open model stack now breaks into five layers: model, inference, gateway/router, harness, and tools. Each layer can evolve independently, so developers can swap in better models, providers, or tools as the ecosystem changes. The company published a full breakdown of the stack on its blog.

## Post

the open model stack is becoming composable

model → inference → gateway/router → harness → tools

each layer can evolve independently, so you can swap in better models, providers + tools as the ecosystem moves

we broke down the full stack ↓
https://together.ai/blog/the-open-source-ai-stack

![](https://badinfluence.news/api/img-proxy?u=https%3A%2F%2Fpbs.twimg.com%2Fmedia%2FHVpjKnaW0AA07km.jpg&mode=thumb&exp=1793404800&sig=26afe7f690fca743)