Anthropic renames Workbench to Playground, adds full API request/response visibility

Anthropic has renamed the Claude Console's prompt-testing tool from Workbench to Playground, pairing the rebrand with expanded coverage of the Messages API and new visibility into the raw requests and responses the tool generates.

What's new

According to Anthropic's Claude Platform release notes, updated August 18, 2026: "Workbench is now Playground in the Claude Console. Playground supports every Messages API parameter and includes templates that demonstrate API features such as code execution and web search. It shows the full SDK request and the API response for each run, to help you understand the API and build with it."

The new tool is available at platform.claude.com/playground. Key changes over the old Workbench:

• Full parameter coverage — every Messages API parameter is now exposed in the UI, rather than a subset.
• Feature templates — built-in examples demonstrate API capabilities like code execution and web search, giving developers a working starting point instead of a blank prompt box.
• Request/response transparency — each run now displays the complete SDK request alongside the API response, so developers can see exactly what was sent and inspect the raw output rather than just a rendered chat view.

The transition has been telegraphed for weeks. Anthropic's release notes show that on July 17, 2026, the company announced the legacy Workbench would sunset, with access ending August 17 — one day before this rename went live. Saved prompts, variables, and evals from the old tool are not carried over; Anthropic told developers to export anything they wanted to keep beforehand. The experimental prompt-tools APIs (generate_prompt, improve_prompt, templatize_prompt) were retired in the same cutover.

Context

Workbench had been the Claude Console's interactive prompt-testing surface since early in the Claude API's life, used mainly for quick iteration on prompts and system messages. As Anthropic has pushed further into agentic tooling this year — Claude Managed Agents, Dreams, Inference Hooks — the older Workbench interface increasingly lagged the API surface it was meant to demonstrate, lacking parameter coverage for newer features.

Why it matters

A rename alone wouldn't be notable, but the added request/response transparency addresses a real friction point for developers building against the Messages API: understanding exactly what a given UI action translates to as a raw API call. Surfacing the full SDK request next to the response turns Playground into more of a live API reference than a chat sandbox, which should shorten the loop between reading docs and shipping working code — a small but concrete piece of Anthropic's broader push to keep its developer tooling aligned with an API surface that has grown considerably more complex over the past year.