Anthropic has two API deadlines in August. The first — Claude Opus 4.1 retiring August 5 — has been widely covered. The second gets ignored until it breaks something. On August 17, 2026, the legacy Claude Platform Workbench shuts down permanently, taking with it three experimental prompt-engineering API endpoints that some teams quietly baked into production. If your pipeline ever touched /v1/experimental/generate_prompt, /v1/experimental/improve_prompt, or /v1/experimental/templatize_prompt, you have three weeks to reroute before those calls start returning hard errors. What Is Actually Being Retired Two separate things are going away on the same day. First: the legacy Workbench UI at platform.claude.com/workbench. […]
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