Code execution gains REPL state persistence; 7 SDKs updated
1 featureThis release1 featureNew capabilitiesAI-tallied from the release notes
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The 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. To adopt it, set the tool's type to code_execution_20260120; no beta header is required. It's available on Claude Fable 5, Claude Mythos 5, Claude Opus 4.5 and newer, and Claude Sonnet 4.5 and newer.
Fetched July 13, 2026
