Arthur Mensch Teases a 'Fat but Sparse' MoE Family, Opening July Early Access for Research and Government Partners

X/Twitter (Arthur Mensch)via @arthurmensch·medium signal

Separate from its robotics push, Mensch confirmed a new open-weight Mixture-of-Experts family he describes as 'fat indeed, but sparse,' with a July early-access program for research, government, and industry partners and a broader release expected later this summer. Parameter counts, benchmarks, and license terms are still undisclosed, but the sparse-activation framing signals a bid to close the frontier gap on efficiency rather than raw dense scale. Context for builders weighing open-weight bets: Mistral's ARR has topped $400M with a €4B EU data-center buildout underway.