# Meta and MIT find looping transformer layers can beat plain models

> Original title: New Meta and MIT paper finds reusing a transformer's layers in loops can beat a plain model.

- Source: Rohan Paul
- Published: 2026-11-02T11:53:55.000Z
- Bad Influence: https://badinfluence.news/items/rvkwjxhalejms7v4aa4qkfgvi
- Original: https://x.com/rohanpaul_ai/status/2117223679264473544

## Summary

Meta and MIT researchers found that running a transformer's layers in loops can beat a plain model at the same parameter count. They trained dense models up to 1B parameters on up to 155B tokens, testing where to loop and how many times. Looping the whole stack gave the best quality at a fixed size, while looping middle layers paid off most when training compute was tight.

## Post

New Meta and MIT paper finds reusing a transformer's layers in loops can beat a plain model.

Looping runs the same layers several times, giving a model more depth without more parameters. But each loop costs compute and normally runs in sequence for every token.

They trained dense models up to 1B parameters on up to 155B tokens, testing where to loop and how many times. They also added tiny per-loop adapters and repaired a parallel looping method so loops can run at once during decoding.

Looping the whole stack gave the best quality at a fixed size, while looping middle layers paid off best when training compute was tight. Per-loop adapters added only 1.1 to 4.3% more parameters, versus 51.4% for doubling depth, and helped more as loops increased.

![](https://badinfluence.news/api/img-proxy?u=https%3A%2F%2Fpbs.twimg.com%2Fmedia%2FHWHjfNxaEAA76qc.jpg&mode=thumb&exp=1793836800&sig=9c6c77d0fbe0ed2c)