Latest open artifacts (#22): Zyphra, Cohere, and Poolside are expanding the breadth of the ecosystem

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• Core argument: the open model ecosystem is diversifying beyond a handful of Chinese labs into varied actors (frontier makers, big tech, specialized product builders), which strengthens it and makes restriction attempts both futile and counterproductive.
• Round-up of releases: Nvidia Nemotron-3-Ultra-550B (LatentMoE, new OpenMDW weights license), Cohere Command A+ (218B-A25B MoE, shifted to Apache 2.0), GLM-5.2, and Zyphra ZAYA1 (74B-A4B and 8B-A0.6B, trained on AMD infra).
• Categorizes participant motivations into three types — frontier model makers, big tech leveraging ecosystem effects, and product companies shipping specialized smaller models.
• Practical takeaway: teams building on open models can now draw on a wider spread of architectures and training recipes, with real value in both frontier chasing and narrow domain-specific releases.