Mistral unveils a roughly one-trillion-parameter open-weight model

What happened: France's Mistral unveiled Large 4, nicknamed Lechon, with a little over one trillion parameters and 49 billion active per word, a mixture-of-experts design. It was trained from scratch on 4,000 Nvidia Grace Blackwell GPUs over two months in Mistral's own European data centers and covers more than 160 languages. It's available through Mistral's API now; weights are due October 27 under Mistral's own license, not a standard open-source one. VentureBeat notes its coding score doesn't establish an outright lead.
The claim: Mistral calls it the most powerful open-weight AI outside China; co-founder Guillaume Lample says it is at the frontier of open-weight models. Mistral's own benchmarks put it at 62% on a software-engineering test.
Austin's take: Austin welcomes more competition and open models from Europe, and ties the compute-heavy training to why companies like SpaceX are borrowing for chips. He's curious what the custom license actually means.
Why it matters: Two big non-Chinese open models in two days means the open-weight race is no longer China's alone.
What to do: Developers can try it via the API now; read the license terms before planning to self-host once weights land October 27.
Not confirmed yet: Benchmark figures are Mistral's own, and license implications are unclear.

The Loop