Claude Opus 5.5 Turbo Mode has concluded its research preview and is now fully available to all developers, with the waiting list removed. This mode does not compromise model weights or intelligence; instead, it enhances output speed by 2.5 times through optimized underlying configurations. It is only supported by select models in the Opus series and can be enabled by adding a single parameter. Additionally, the billing price for this mode has been reduced, featuring independent rate limiting and non-shared prompt caching with the standard mode. The official platform also provides billing inquiry methods for different user groups and enterprise-level management solutions to prevent excessive cost consumption. Furthermore, Claude recently introduced an idle compression feature to reduce token consumption in long sessions, which users can choose to disable. Currently, Fable 5.5 has entered early grayscale testing and is expected to be officially released soon.