Anthropic launches Claude Opus 5.5, first model in its 5.5 family
Claude Opus 5.5 launch
AISummary
Anthropic has launched Claude Opus 5.5, the first model in its new Claude 5.5 family. The company says it performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.
AIWhy it matters
The release note gives a direct comparison to Claude Fable 5.1 and a 40% running cost reduction versus Opus 5, which helps readers weigh the tradeoff.
Source: Claude Apps Release Notes · support.claude.com