# Claude Platform Claude Platform release notes — June 18, 2026

- Product: Claude Platform (https://whatsnew.fyi/product/claude-platform)
- Vendor: Anthropic
- Date: 2026-06-18
- Original notes: https://platform.claude.com/docs/en/release-notes/overview#june-18-2026
- Permalink: https://whatsnew.fyi/product/claude-platform/releases/2026-06-18-claude-platform-release-notes-june-18-2026

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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 f…

- **added** — Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now include support for code_execution_20260120 tool version with REPL state persistence