Anthropic launched Claude Opus 5.5 on Tuesday, a lower-cost AI model aimed at
broad commercial tasks as the company prepares for a Wall Street IPO. The firm
said Opus 5.5 matches the performance of its more powerful Fable 5.1 across most
workloads while substantially reducing usage costs versus the prior Opus 5; it
also reported faster output and clearer generations. Anthropic plans to expand
the 5.5 series in coming weeks with updated Claude Sonnet and Haiku models.