Anthropic Says Claude Opus 5.5 Is Available, With Public Specs Still Sparse

Anthropic said Claude Opus 5.5 is available today, introducing a new Opus-branded model for the company's high-end Claude line. The announcement arrived before the public web materials reviewed for this article had caught up: Anthropic's pricing, API reference and Opus documentation still listed Claude Opus 5, not a public claude-opus-5-5 model ID, price table, benchmark chart or system card.