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Anthropic's August Calendar: Opus 4.1 API Retirement Aug 5, Workbench Aug 17, Sonnet 5 Promo Pricing Ends Aug 31
Anthropic's platform release notes stack four dated changes into the next month that will break or re-price running integrations: Claude Opus 4.1 retires from the Claude API on August 5; the experimental prompt tools APIs retire alongside the Workbench on August 17; the temporary 50% weekly usage boost for Claude Code subscribers runs through August 19; and Claude Sonnet 5's promotional $2/$10 per million tokens ends August 31, reverting to $3/$15 on September 1 — a 50% input price increase. Anyone with Opus 4.1 pinned in production has three days.
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