Claude Code v2.1.219 Sets Claude Opus 5 as Default Opus Model

Anthropic

Tools official + media 2 src. ~1 min

Claude Code v2.1.219 (July 24) defaults to Claude Opus 5 (1M-token context) for complex agentic tasks, adds nested subagent forwarding for depth-2+ subagents, and a sandbox.network.strictAllowlist option for network access control. v2.1.220 (July 25) followed with bug fixes.

Why it matters

Brings Anthropic's latest reasoning model to Claude Code by default, improving multi-step code generation, and adds hierarchical subagent support.

Importance: 3/5

Default-model change for a widely used coding agent.

claude-code cli agentic

Sources

official Claude Code Changelog

media Claude Code v2.1.220 (Jul 24, 2026) — Every Release, Summarized (syndicated from Havoptic)