# Crusoe shares lessons from building a post-training platform

> Original title: 5 | @CrusoeAI

- Source: LMSYS Org
- Published: 2026-11-05T22:43:28.000Z
- Bad Influence: https://badinfluence.news/items/eu1q30s01wcnrnrg2ifkgp3ti
- Original: https://x.com/lmsysorg/status/2118474303700336710

## Summary

Crusoe engineers Yiwei Song and Daniel Shen share lessons from building a supervised fine-tuning and reinforcement learning platform. Their topics include training accuracy, context length, flexible APIs, and debugging customer jobs.

## Post

5 | @CrusoeAI 
Challenges and Learnings of Building a Post-Training Platform

Yiwei Song & Daniel Shen share lessons from building an SFT and RL platform: training accuracy, context length, flexible APIs, and debugging customer jobs.

![](https://badinfluence.news/api/img-proxy?u=https%3A%2F%2Fpbs.twimg.com%2Fmedia%2FHWZTOIgaYAAP1ig.jpg&mode=thumb&exp=1794182400&sig=1d6ffa3d2a12b566)