Meta 发布 Muse Spark Open 等模型，重塑开源前沿格局
原标题：Meta shakes up the frontiers, open and closed
AI 摘要
Meta 发布开放权重模型 Muse Spark Open（816B 总参数/42B 激活参数，1M 上下文，原生多模态），成为当前最强的美国开源模型，显著缩小了美国与中国开源模型之间的差距。文章同时提到 Reflection 的 Beam 和 Mistral Large 4 等新模型，并分析 Meta 自定义许可证中的署名、营收门槛等限制可能影响采用。此外，Meta 还发布了闭源前沿模型 Muse Wonder 系列，文章借此讨论 Meta 在西方前沿实验室中的层级定位。
正文节选
This has been a week where the balance of American open-weight models took a step change back toward the frontier. Meta took the lead of this charge with Muse Spark Open, which is now the strongest American-made open model by quite some margin, but the addition of Reflection’s first model Beam is also relevant. Without these two models, there would be 20+ open-weight models built and released by Chinese companies better than the best Western models. At the time of writing this, Mistral has also