Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now support code_execution_20260120, the code execution tool version that adds REPL state persistence and is the minimum version for programmatic tool calling. Set tool type to code_execution_20260120; no beta header required. Available on Claude Fable 5, Claude Mythos 5, Claude Opus 4.5+, and Claude Sonnet 4.5+.
Fetched June 28, 2026
The Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now include support for code_execution_20260120, the code execution tool version t…
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