Spark-X2.5 Audited: What a 4B Coding Agent Can Actually Do on Two T4s
I audited every claim on the Spark-X2.5 model cards and stress-tested both the 4B and 1.7B on agentic coding tasks over two Tesla T4s. The 4B is a genuinely usable small coding agent. The 1.7B is an assistant, not an agent. And both models have a thinking-verbosity tax worth knowing about.