Anthropic released Claude Opus 5.5 today—the first model in its 5.5...

Anthropic released Claude Opus 5.5 today—the first model in its 5.5 series—matching Fable 5.1 across most tasks at 40% lower cost and over 30% faster output. This debut follows Anthropic’s commitment to “pace the frontier,” achieving its strongest alignment audit score so far.