Anthropic rebrands Workbench as Playground for API exploration

Anthropic quietly flipped the sign on one of its core developer tools this week. The company retired the legacy Workbench on August 17, 2026, and launched its replacement, now called Playground, the very next day inside the Claude Console. What changed, and what disappeared Playground is stateless. That means no saved prompts, no history, no evaluations sitting on Anthropic’s servers. Every session lives in the browser and disappears when you close the tab. The core functions that remain are the ones developers actually reach for during active experimentation: real-time testing of Claude models, full request and response inspection, support for tool usage and structured outputs, and parameter adjustments. There is also a one-click code export feature that converts whatever you have built in the interface directly into working Python or TypeScript. Three experimental prompt-engineering API endpoints did not make the transition. The generate_prompt, improve_prompt, and templatize_prompt endpoints were retired alongside Workbench, and Anthropic has not announced replacements for any of them. Users had until September 1, 2026 to export any data still sitting in the legacy Workbench. Af...