Opus 5.5 doesn't reset prompt cache when changing reasoning effort, notes daniel_mac8
daniel_mac8 · x · 2026-10-11
In a follow-up, danielmac8 notes these cache-optimization habits should generally work well for Claude too. A notable detail: Opus 5.5 does not reset the prompt cache when you change reasoning effort mid-session, unlike the OpenAI behavior described earlier.
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