Everything Claude Opus 5.5 Actually Ships With

Claude Opus 5.5 is priced 20% lower than Claude Opus 5, costing $4 per million input tokens and $20 per million output tokens. Across 468 graded calls, both models were correct on every task, but Claude Opus 5.5 billed $0.0072 per task compared to $0.0204 for Claude Opus 5. Even at identical prices, Claude Opus 5.5 remains 56% cheaper on single-shot tasks, while multi-hop tool loops show a 22% saving when rate cards are constant.