SDKs support persisted REPL state code execution

June 18, 2026Claude PlatformView original ↗

7 features

From the original release noteView original ↗

Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now include support for code_execution_20260120, the code execution tool version that adds REPL state persistence and is the minimum version for programmatic tool calling. Available on Claude Fable 5, Claude Mythos 5, Claude Opus 4.5 and newer, and Claude Sonnet 4.5 and newer.

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Fetched July 22, 2026

SDKs support persisted REPL state code execution — Claude… — releases.sh