Is Anthropic: Claude Opus 4.5 or Anthropic: Claude Sonnet 4.5 cheaper?
Anthropic: Claude Sonnet 4.5 is cheaper ($0.434 / 1M tokens input / $2.17 / 1M tokens output) vs Anthropic: Claude Opus 4.5 ($0.723 / 1M tokens input / $3.62 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.