## Everything Claude Opus 5.5 Actually Ships With This article pulls together every verifiable number and detail from Anthropic's announcement, the platform documentation, the system card, and independent coverage, so you have one place to check the facts. Anthropic released Claude Opus 5.5 on September 22, 2026. It's the first model in the new Claude 5.5 family, and according to Anthropic's own announcement, it performs at roughly the level of Claude Fable 5.1 on most work while costing 40% less to run than Opus 5. This article pulls together every verifiable number and detail from…