Choosing an Agentic Model for a 2× DGX Spark Cluster (September 2026)
Summary. In September 2026 there are three models on Hugging Face you would want to put on a pair of DGX Sparks behind Claude Code: DeepSeek-V4.1-Flash at 552B, GLM-5.3-Flash at 320B and Qwen3.8-Flash-Next at 125B. The first leads every benchmark but does not fit in 243 GiB even at 4 bits. The second takes 198 GB and 15 minutes to load. The third fits on a single Spark — apart from the 2 GB it is short. Below: why on this cluster the choice is made by memory arithmetic rather than a benchmark table, why 6 billion active parameters do not give you 90 tok/s, and why for Claude Code what decides it is not tok/s but a single vLLM flag that the fastest config turns off. ...