28 May 2026claude#model#opus#workflows#effort
Claude Opus 4.8 — dynamic workflows and user-controlled effort
Opus 4.8 improved agentic judgment and launched with effort control, cheaper fast mode, and research-preview dynamic workflows in Claude Code.
Anthropic released Claude Opus 4.8 at the same base price as its predecessor.
What changed
- Improved judgment, tool use, collaboration, and reliability on long-running agent tasks.
- A user-facing effort control in Claude and Claude Cowork balanced depth against speed and usage.
- Claude Code dynamic workflows could plan large tasks and coordinate many background subagents in research preview.
- Fast mode remained roughly 2.5 times faster and became substantially less expensive than the earlier Opus fast-mode offering.
Why it matters
Dynamic workflows target migrations and other codebase-scale work, but parallelism can multiply token use quickly. Treat generated output as a proposed change set and keep tests, review, and concurrency limits in place.