The harness you wrap around an open model can swing both solve rates and cost by large margins — opencode ran to US$3.35 per solved task, 11.7 times Pi's cost, on identical models. Teams self-hosting GLM, DeepSeek or Kimi models should pick a harness per model rather than a single default. The companion Harness Lens documents prompts, tools and compaction across 34 harnesses with source links.
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Cost and privacy trade-offs in agent execution do not move together — once task completion converges, strategy choice is mostly a privacy decision, and the best-scoring setup is also the most exposed. Teams deploying on-device agents can pick a collaboration mode based on edge model size: route execution to the cloud for small models, use cloud advisory for 9B-class ones. The comparison against Tsinghua-affiliated GLM-5.3 makes the findings directly applicable to Chinese open-source model stacks.
Benchmark scores often reflect the harness as much as the model, and this 4.4% to 61.1% jump on identical weights is a stark demonstration of that gap. Teams evaluating long-context agents should benchmark models with purpose-built harnesses rather than off-the-shelf chat loops, or risk underestimating a model's real capability. The paper (arXiv 2610.13075) offers a concrete design: explicit state for evidence and conclusions that revise each other.
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Qwen 3.8 outperforms other open models in document extraction, offering a cost-effective alternative to proprietary solutions for ASEAN businesses.
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