Anthropic's newest model, Opus 5.5, was released on Tuesday, setting a new state-of-the-art in coding and knowledge work performance. The company stated it is "the strongest-performing model we've tested to date," notably outperforming the larger Fable model in many benchmarks and informal tasks. Output tokens for Opus 5.5 will be charged at $20 per mTok, down from $25 for the previous model, reflecting reduced compute requirements and faster operation. This is the first model release since CEO Dario Amodei embraced calls to pace the frontier, deliberately slowing down AI capabilities advancement to match alignment progress.