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Back to Mental Models

Smarter Model Cost Paradox

Counter-intuitively, using more expensive, smarter AI models often costs less overall because they require fewer iterations and use fewer total tokens

Decision Rule

Always start with the smartest available model, even if per-token cost is higher

How It Works

Smarter models get things right on first try, reducing back-and-forth iterations that consume tokens exponentially

Failure Modes

Optimizing for per-token cost rather than total cost

Using cheaper models for complex tasks requiring multiple attempts

Not factoring in time and opportunity cost of iterations

Example Decision

Choose Opus 4.5 over Sonnet for coding tasks because despite 3x higher per-token cost, it typically uses 5x fewer tokens due to accuracy