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Loading.Notes on building and running software.
The same agent task can cost 30x more on one run than another, spending more tokens does not buy more accuracy, and the model itself cannot tell you the bill before it runs. A 2026 study across 8 frontier models on SWE-bench Verified put numbers on all three. The cost is not high so much as it is unpredictable.
Apple tested frontier reasoning models on puzzles of rising complexity and watched accuracy fall off a cliff past a threshold, even when the models were handed the exact algorithm. The critics have a real point about the setup. The lesson for your hardest problems survives both.
Past a point, adding tools makes an agent worse. The failure is not calling the tool; it is planning across a big tool ecosystem when tools fail silently. A 2026 benchmark across 1,665 tools watched one model fall from 51.90% to 11.36% as conditions got harder.
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