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PR #24151 routed Portal Qwen (qwen3.6-plus) through the prefix_and_2 long-lived cache layout, attaching {"type":"ephemeral","ttl":"1h"} markers to the tools[-1] entry and the stable system-prefix block. That layout works for Portal Claude because Anthropic / OpenRouter on Anthropic routes honour 1h TTL — but Portal Qwen ultimately proxies to Alibaba DashScope, which documents a single "ephemeral" TTL of 5 minutes on its Context Cache. The ttl="1h" qualifier is silently dropped upstream, so the two highest-value breakpoints (tools array + system prefix) never land. Only the rolling-window 5m markers on the last 2 messages cache, which matches the observed ~25% read rate. Fix: keep Portal Qwen on cache_control via _anthropic_prompt_cache_policy returning (True, False), but drop it from _supports_long_lived_anthropic_cache so it rides the standard system_and_3 5m layout (system + last 3 messages, all at 5m). Same 4 breakpoints, all in a TTL the upstream actually honours. Refs: https://www.alibabacloud.com/help/en/model-studio/context-cache https://openrouter.ai/docs/features/prompt-caching (Alibaba Qwen section: "TTL: 5 minutes") - _supports_long_lived_anthropic_cache: Portal scope narrowed back to Claude - tests: flip the two qwen long-lived expectations to False, retitle non_claude_non_qwen_rejected -> non_claude_rejected