i've been testing opus 5.5 for a couple of years now
it's very good. it feels like an improvement over previous models like haiku, especially for coding tasks like centering a div
Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family.
It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.