Opus 4.8 ships Dynamic Workflows — hundreds of parallel subagents per session. Read this before you wire it into prod.
Anthropic's Opus 4.8 announcement on May 28 spent most of its word count on benchmarks. CursorBench up. Terminal-Bench 2.1 beats GPT-5.5. OSWorld-Verified at 82.3%. Online-Mind2Web at 84%. The legal-agent benchmark broke 10% on all-pass for the first time. Those are the numbers the headline writers grabbed.
Buried under the benchmark table is the line that actually changes how you ship agents:
Dynamic Workflows. Run hundreds of parallel subagents. Handle codebase-scale migrations spanning hundreds of thousands of lines.
That is not a benchmark. That is a new programming model. And it is shipping as a preview, which means the defaults are not what they will be in 90 days. If you are running agents in production and you do not pin your config before the next minor release, your bill is going to surprise you.
