Post
89
I published the serving setup and benchmark results I’ve been using for GLM-5.3-Flash UD-IQ1_S on a single NVIDIA DGX Spark.
The biggest finding was not throughput — it was reliability.
With llama.cpp’s default unrestricted reasoning, a real ~18K-token OpenCode request with 53 tools failed to produce any actionable output in 9/20 runs.
Adding:
--reasoning-budget 2048
changed that to 20/20 successful tool-call responses.
A few other measured results:
* 27.5–29 tok/s decode with MTP vs 18.7 without
* MTP depth 2 outperformed the default depth 3
* 131K context uses ~90.9 GiB resident memory
* 256K context also works on the Spark
* CPU MoE offload does not meaningfully free memory on GB10 unified memory
* newer llama.cpp builds were slightly faster, but introduced tool-call serialization failures, so the repo pins the stable commit
Everything in the README is backed by the benchmark scripts and raw results in the repo.
If you're running GLM-5.3-Flash on a DGX Spark for agentic coding, this should give you a solid starting point.
https://github.com/cahlen/glm-5.3-flash-GGUF-1bit-dgx-spark
unsloth/GLM-5.3-Flash-GGUF
The biggest finding was not throughput — it was reliability.
With llama.cpp’s default unrestricted reasoning, a real ~18K-token OpenCode request with 53 tools failed to produce any actionable output in 9/20 runs.
Adding:
--reasoning-budget 2048
changed that to 20/20 successful tool-call responses.
A few other measured results:
* 27.5–29 tok/s decode with MTP vs 18.7 without
* MTP depth 2 outperformed the default depth 3
* 131K context uses ~90.9 GiB resident memory
* 256K context also works on the Spark
* CPU MoE offload does not meaningfully free memory on GB10 unified memory
* newer llama.cpp builds were slightly faster, but introduced tool-call serialization failures, so the repo pins the stable commit
Everything in the README is backed by the benchmark scripts and raw results in the repo.
If you're running GLM-5.3-Flash on a DGX Spark for agentic coding, this should give you a solid starting point.
https://github.com/cahlen/glm-5.3-flash-GGUF-1bit-dgx-spark
unsloth/GLM-5.3-Flash-GGUF