# Claude Code 2.1.219 — Opus 5 becomes default, subagents nest to depth 3

> Anthropic's terminal coding agent adopts Opus 5 as its default and lets subagents spin up their own subagents three layers deep.

- Org: Anthropic
- Date: 2026-07-24
- Category: tool, repo
- Source: https://github.com/anthropics/claude-code/releases/tag/v2.1.219
- Canonical page: https://ai-tldr.dev/releases/anthropic-claude-code-2-1-219/

## In short

Claude Code 2.1.219 makes Claude Opus 5 the default Opus model in the CLI, adds a 1M-token context in fast mode, subagent nesting up to depth 3, and a strict sandbox network allowlist that refuses non-allowed hosts without prompting.

## What it is

Opus 5 replaces Opus 4.7 as Claude Code's default Opus model in v2.1.219, arriving with a 1M-token context and a fast-mode price of $10 in and $50 out per million tokens. The release also adds a strict sandbox network allowlist that refuses non-allowed hosts without prompting the user, plus a new DirectoryAdded hook that fires when `/add-dir` or the SDK's `register_repo_root` request registers a working directory mid-session.

## How it works

Subagents spawned by Claude Code can now spawn their own subagents down to three levels deep — the previous limit was one — with `CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH=1` turning nesting off for workflows that assume a flat structure. Nested subagents at depth 2 or more surface in the headless stream-json output when `--forward-subagent-text` is set, keyed by their spawning tool_use id, so an orchestrator can see the whole tree instead of only its immediate children.

## Why it matters

Users of the Claude Code CLI pick up Opus 5's stronger long-horizon coding without changing model flags, and the deeper subagent tree lets one automated workflow decompose a task into workers of workers rather than a flat fan-out — the shape most complex orchestration actually wants. The stricter sandbox allowlist also removes a common approval-fatigue paper cut when running untrusted commands in headless CI or a batch job.

## Who it's for

Claude Code power users, teams running Claude Code in CI, and anyone building multi-agent workflows on top of the CLI.

## Try it

npm install -g @anthropic-ai/claude-code@2.1.219

## Quick facts

- Maker: Anthropic
- Version: 2.1.219
- Released: 2026-07-24
- New default Opus: Claude Opus 5 (1M context)
- Fast mode price: $10 in / $50 out per 1M tokens
- Subagent nesting: 3 levels deep (was 1)
- Removed from fast mode: Opus 4.7

## FAQ

### What changed for Opus 4.7 users in Claude Code 2.1.219?

Claude Code 2.1.219 removes Opus 4.7 from fast mode. The `/fast` flag now routes to Opus 5 or Opus 4.8 only, so anyone who was pinning `/fast` to Opus 4.7 in the CLI must pick a different model or drop out of fast mode entirely.

### How does deeper subagent nesting work in Claude Code 2.1.219?

Claude Code 2.1.219 lets a subagent spawn its own subagents down to three levels deep, up from a hard cap of one. Set the `CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH=1` environment variable to keep the old flat behaviour when a workflow assumes a single fan-out.

### What is the strict sandbox allowlist in Claude Code 2.1.219?

A new `sandbox.network.strictAllowlist` setting causes the Claude Code sandbox to refuse any host that isn't on the explicit allowlist instead of prompting for approval. Operators can lock down which domains a sandboxed command may reach without a human having to click through every unknown request.

### How much does Claude Opus 5 cost in Claude Code fast mode?

Claude Opus 5 in Claude Code's fast mode is billed at $10 per million input tokens and $50 per million output tokens, per the v2.1.219 release notes. Standard-mode pricing follows the usual Anthropic API rates rather than the fast-mode surcharge.

## Links

- [Release notes](https://github.com/anthropics/claude-code/releases/tag/v2.1.219)
- [Full changelog](https://code.claude.com/docs/en/changelog)
- [Claude Opus 5 launch](https://www.anthropic.com/news/claude-opus-5)
- [Docs](https://code.claude.com/docs/en/overview)