Meta on Thursday launched a new open-weight AI model which it claims rivals, and in some cases outperforms, similar products from leading Chinese developers.
Muse Spark Open “is the most capable US open-weight model to date,” Meta’s chief of AI Alexandr Wang wrote on X.
Unlike so-called closed models — such as Anthropic’s Claude or OpenAI’s ChatGPT — developers can download the parameters or weights of an open-weight model and then customise it.
Chinese developers have emerged as dominant players in the open-weight market for AI models over the past couple of years.
Alibaba’s Qwen, Moonshot AI’s Kimi K3 and Z.ai’s GLM models have been considered open-weight frontrunners globally, but Meta claims its new open model now competes on a similar level.
“Built for coding and agentic work,” Muse Spark Open “excels at long-horizon tasks, complex software engineering, and multi-step reasoning,” Meta said in a blog post, adding that “strong
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