The Advisor in the Room
Anthropic's new advisor tool formalizes a pattern that practitioners have been assembling by hand: a fast executor model (Sonnet or Haiku) that can consult Opus for strategic guidance mid-generation, entirely server-side within a single API call. The benchmarks show real gains and the implementation is notably clean — but the more interesting shift is architectural: it treats Opus-level intelligence as a resource to be invoked selectively rather than paid for on every token.
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