# Microsoft Research open-sources RetroChimera, a retrosynthesis model published in Nature

> Microsoft Research published RetroChimera in Nature, an ensemble retrosynthesis model it says outperforms prior models in blind tests, and released its code and weights.

- **Topic**: Research
- **Published**: 2026-10-01T13:55:30.288Z
- **Canonical URL**: https://highsignal.sh/stories/microsoft-research-open-sources-retrochimera-a-retrosynthesis-model-published-ec89164a

## Why It Matters

Retrosynthesis planning is still largely manual and a major driver of drug development costs, so a freely available, independently published route-prediction model could speed up how researchers design new medicines and materials — a quieter AI-for-science development than the day's frontier model news.

## Primary Sources & Citations

- [Improving synthesis prediction of small molecules at scale with RetroChimera](https://www.microsoft.com/en-us/research/blog/improving-synthesis-prediction-of-small-molecules-at-scale-with-retrochimera/) — *Microsoft Research AI* (Primary source)

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