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 3, 2026
Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now support code_execution_20260120, the code execution tool version that adds REPL st…
Anthropic · Claude PlatformWe launched Claude Sonnet 5, our most agentic Sonnet model yet, with substantial improvements over Sonnet 4.6 in reasoning, tool use, codin…
Anthropic · ClaudeCodeQL now supports Kotlin up to 2.4.0 and introduces a JavaScript/TypeScript query for system prompt injection targeting untrusted values…
GitHub · GitHub ChangelogCodex is now available as an agent provider in public preview for JetBrains IDEs. Custom models configured by GitHub Copilot Business and E…
GitHub · GitHub Changelog
