Anthropic prices Claude Opus 4.5 at $5/1M input and $25/1M output tokens, much cheaper than Opus 4.1 at $15/$75 but still pricier than GPT-5.1 and Gemini 3 Pro news simonwillison.net

Simon Willison / Simon Willison's Weblog: Anthropic prices Claude Opus 4.5 at $5/1M input and $25/1M output tokens, much cheaper than Opus 4.1 at $15/$75 but still pricier than GPT-5.1 and Gemini 3 Pro  —  Anthropic released Claude Opus 4.5 this morning, which they call “best model in the world for coding, agents, and computer use”.