Best Open-Weight LLMs in October 2026: Meta Muse Spark Open and 6 More

October 2026 saw a wave of major open-weight LLM releases, giving organizations alternatives to dependence on a single proprietary API through self-hosting or switching among providers and regions. Meta’s Muse Spark Open targets long-context, multimodal agent workflows and tool calling but uses a proprietary license, while Moonshot AI’s Kimi K3 remains a high-performing option for coding and research with broad European availability. Z.ai’s GLM-5.3 is positioned for agentic coding and tool use, with its Flash version under MIT and extensive EU hosting routes, while DeepSeek V4.1 Flash combines an MIT license, strong coding-agent benchmarks, the lowest listed cost, and the widest provider selection. MiniMax M3.1 Flash emphasizes low-cost, fast agentic tasks but should be used with verification because of reported hallucination concerns, and it lacks EU hosting. Reflection’s Beam 1.0 offers an Apache 2.0 license and competitive reasoning results despite trailing leading rivals in many coding tests, while Switzerland-based Apertus v1.5 70B prioritizes auditability, fully open licensing, and Swiss data residency over frontier-scale performance. The models can be accessed through a unified Eden AI API, whose European endpoint restricts calls to models with EU routes, helping organizations maintain data-residency requirements while testing providers and models.

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