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Anthropic's cost fix: use Claude Opus 4 as planner and Sonnet 5 for tasks — saves 37%

Anthropic recommends using its expensive Claude Opus 4 model primarily as a high-level planner that delegates individual tasks to the cheaper Claude Sonnet 5, rather than running Opus 4 on every query. The "Advisor" pattern combining both models achieves 92% of Opus 4's solo performance at just 63% of the cost — a 37% saving. The approach is aimed at companies looking to cut AI spending without a major quality drop.

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