Opus 5.5 is a very good model and I expect it will quickly become the daily driver for a lot of people.
The writing style is so much better. It writes like Opus 4.6 and codes like Fable 5.1.
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.