Laguna S2.1 has been a significant disappointment. Here's a version of a Rubik's Cube solver that Laguna S2.1 (q4km quant) worked on for several hours, and never got working completely:

https://com-pute.com/nick/rubiks-cube-lagunaS21-partial-fail.html

Here's the Pi session:

https://com-pute.com/nick/rubiks-cube-lagunaS21-partial-fail--pi-session-2026-08-08T22-03-31-622Z_019fe367-15a6-72c7-8330-11a0cac3207f.html

Deepseek v4 Flash did a great job with the same prompt:

https://aibynick.com/thread/50?page=2#post-180

Even Qwen 3.6 35a3 did a great job - and in just a few minutes on a local machine (and this version of Qwen can run on a much smaller GPU):

https://com-pute.com/nick/qwenrubiks.html