Claude Opus 4.8 + effort control + 3x cheaper fast mode

Flagship upgrade at the same $5/$25 per-1M base price; user-level effort control (low/high/extra/max) and a fast mode cut from $30/$150 to $10/$50 per 1M tokens.

What it means A per-call cost-vs-depth lever — dial low-effort for mechanical lanes, max-effort for hard reasoning. Materially changes how agent runs are budgeted.