---
url: https://lettuceai.app/blog
title: "Blog — LettuceAI"
description: "Notes from the LettuceAI team — releases, technical deep-dives, and the thinking behind the product."
---

Blog

# Notes & writing

Releases, technical deep-dives, and the thinking behind the product. Written by the people building it.

[

![lettuce-emb-v4, a roleplay-first embedder](https://lhdgeo5fms.ufs.sh/f/m0TBUtMLsaiEKi2KVajUThaiVjQ5lFnW8C6uS7RMmf4pPb9t)

Announcements·Notes

## lettuce-emb-v4, a roleplay-first embedder

v3 hit 0.02 recall@1 on roleplay memory. v4 hits 0.924, with 768d native embeddings, Matryoshka dims, and ONNX exports.

May 1, 2026

](/blog/lettuce-emb-v4)

[

![building lettuce-emb-v4, the messy version](https://lhdgeo5fms.ufs.sh/f/m0TBUtMLsaiER1Rvh24Jx2P34yDg6iKGIpAlcoTf9etwqHkz)

Engineering

### building lettuce-emb-v4, the messy version

The v4 release post showed the numbers. This is the run that produced them: dataset throttling, an STS regression, a scheduler bug, and a checkpoint that almost shipped broken.

May 1, 2026](/blog/lettuce-emb-v4-behind)