Anthropic launched Claude Opus 5 on July 24, 2026, describing it as a model that comes close to Claude Fable 5 intelligence at half the price. Opus 5 Is Built Around Cost Adjusted PerformanceAnthropic’s Claude Opus 5 announcement frames the model around performance per dollar, not just raw capability. Claude Opus 5 costs $5 per million input tokens and $25 per million output tokens through the Claude API. Anthropic says this is the same base pricing as Opus 4.8 and half the API price of Claude Fable 5. What is the difference between Claude Opus 5 and Claude Fable 5?