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[MEMORY] Kimi K2.6 has known bug with random switching to Chinese output (reported by Cursor and Reddit users) — critical risk for Czech use [MEMORY] Both Kimi K2.6 and GLM-5.1 are Chinese-English models without specific Czech training data — both risky for Czech [MEMORY] For Czech use with Chinese-English models: always explicitly specify language in system prompt (critical for Kimi K2.6, recommended for GLM-5.1) [MEMORY] Kimi K2.6 vs GLM-5.1 agent comparison: Kimi leads SWE-Bench (80.2% vs ~77.8%), tool-error recovery (91.8% vs 88.4%), code quality (Tier A vs Tier C); GLM-5.1 leads schema adherence (99.6% vs 98.9%), tool-call latency (+140ms vs +210ms); GLM-5.1 tends to hallucinate non-existent APIs [MEMORY] Kimi K2.6 supports `preserve_thinking` mode for multi-turn agent scenarios (retains reasoning content across turns) [SOUL] Reasoning language rule already covers Chinese output risk; new finding confirms Kimi K2.6 specifically triggers this bug — no SOUL change needed, MEMORY note sufficient