Claude Opus 4.8 Is Here: Honesty Gains, Dynamic Workflows, and a 2.5× Faster Fast Mode
Anthropic shipped Claude Opus 4.8 on May 28, 2026. SWE-Bench Pro jumps from 64.3% to 69.2%, Fast Mode runs 2.5× faster at 3× lower cost, and Dynamic Workflows lets Claude Code orchestrate hundreds of subagents. Here's the full developer breakdown.