Qwen3.6 27B

User reports running Qwen3.6-27B as the reasoning layer in a multi-agent orchestrator for 2 weeks, replacing Claude. Plan generation is good, but tool-call reliability is poor with a 12% format error rate, long-context drift appears past ~14k tokens, and cascade-failure handling is weak. The user concludes the model is viable as a reasoning layer but not as an execution layer.