Claude Opus 4.8 Released with Dynamic Workflows and Fast Mode

Released May 28 (the most recent Anthropic model), Opus 4.8 adds three developer-relevant features: (1) Dynamic Workflows — a research preview in Claude Code that splits large-scale jobs across parallel subagents, enabling codebase-wide tasks that were previously impractical; (2) Fast mode — 2.5x higher output tokens/second, now 3x cheaper than previous fast-mode pricing; (3) Live messages API — accepts changes to the messages array mid-task without breaking prompt cache or requiring a new user turn. It also scores 84% on Online-Mind2Web, making it the strongest computer-use agent tested. Available now at claude-opus-4-8 on the API.

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Sources: Anthropic News · TechCrunch · GitHub Copilot Changelog