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Anthropic released Claude Opus 4.8 on May 28, just 41 days after 4.7, and the headline isn’t a benchmark bump — it’s a new way of working called dynamic workflows. In Claude Code, the model can now plan a large task, write a JavaScript orchestration script, and spin up as many as 1,000 subagents running in parallel in a single session.

## What dynamic workflows do

The point is scale that one context window can’t hold. Anthropic says Claude Code with 4.8 can carry out codebase-scale migrations across hundreds of thousands of lines — from kickoff to merge — using the existing test suite as the bar for “done.” The orchestration runs in the background, so one prompt fans out into a structured tree of work instead of a single linear session. It’s in research preview on Enterprise, Team, and Max plans.

## Why it matters

On agentic coding (SWE-Bench Pro) Opus 4.8 scores 69.2%, up from 64.3%, and Anthropic says it’s roughly four times less likely than 4.7 to let a coding flaw slip through unflagged. Paired with a fast mode that runs 2.5x quicker and cheaper, the model is aimed squarely at long-running agent work rather than single answers.