What's changed Opus 4.8 is here! Now defaults to high effort · /effort xhigh for your hardest tasks Introducing dynamic workflows: ask Claude to create a workflow and it orchestrates work across tens to hundreds of agents in the background, so you can take on larger, more complex tasks. Run `/workflows` to view your runs Fast mode on Opus 4.8 is now available at a fraction of its previous cost: 2x the standard rate for 2.5x the speed The lean system prompt is now the default for all models except Haiku, Sonnet, and Opus 4.7 and earlier Claude now reserves the multiple-choice question prompt for decisions it genuinely cannot make itself, instead of asking when it already has enough context to proceed `/simplify` now runs a cleanup-only review (reuse, simplification, efficiency, altitude) and applies the fixes, instead of running the full `/code-review --fix` bug-hunting review Renamed the `/effort` slider labels from "Speed"/"Intelligence" to "Faster"/"Smarter" for clarity `claude agents`: type `! ` to run a shell command as a background session you can attach to and detach from.

Also available as `claude --bg --exec ''` `claude agents`: `/logout` now signs you out instead of…