Claude Opus 4.8 adds effort‑level control, a cheap fast mode, and a dynamic workflow that can run up to 1,000 sub‑agents, and by matching tasks to the appropriate effort and mode users can halve monthly token spend while keeping output quality unchanged.
Anthropic's Claude Opus 4.8 adds modest performance gains, longer context, fast mode, effort control, dynamic workflows, and higher honesty, turning the model from a chat assistant into a dispatchable engineering squad—a shift that brings real‑world productivity benefits but also new risks for developers, product managers, and designers.
Anthropic released Claude Opus 4.8 only 41 days after Opus 4.7, delivering unprecedented 0 % lie‑rate and 0 % lazy‑answer rate, improving code‑defect silence by four‑fold, boosting SWE‑bench Pro to 69.2 % and GDPval‑AA to 1890 Elo, while adding Dynamic Workflows, Effort Control, a richer Messages API and a fast‑mode that runs 2.5× faster for a third of the cost.
