Anthropic SDKs now support code_execution_20260120 with REPL state persistence and programmatic tool calling support.

The adoption path is explicit: set the tool type, with no beta header required.

Builders can adopt the same code execution tool across the listed SDKs and supported Claude models.

• Jun 27, 2026OpenAI retired GPT-4.5 in ChatGPT, including custom GPTs, with existing conversations continuing on GPT-5.5.
• Jun 27, 2026OpenAI modelcard diff removed API docs navigation content.
• Jun 27, 2026Anthropic removed model-card text covering Claude Fable 5 and Claude Mythos 5.

This is the world we build in. It moves this fast. We move with it.