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Claude Code Updates Include Opus 5 and Sandbox Enhancements

Claude Code has introduced Claude Opus 5 as the default Opus model, featuring a 1M context window and a fast mode, alongside new sandbox and configuration settings.

By Illumora Editorial

Source · Jul 24, 2026, 5:14 PM · On Illumora · Jul 24, 2026, 5:17 PM

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Read the source →Claude Code What's New + releases — Claude Code changelog - Claude Code Docs
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Claude Code has released several updates, including the integration of Claude Opus 5 (claude-opus-5) as the new default Opus model. This model offers a 1M context window and a fast mode, priced at $10/$50 per Mtok.

Key Points

  • Claude Opus 5 (claude-opus-5) is now the default Opus model.
  • Claude Opus 5 features a 1M context window.
  • A fast mode for Claude Opus 5 is available at $10/$50 per Mtok.
  • A sandbox.network.strictAllowlist setting was added to deny non-allowlisted hosts for sandboxed commands without prompting.
  • A hook was added that fires after /add-dir or the SDK register_repo_root control request registers a new working directory mid-session.
  • mcp_server_errors was added to the headless stream-json init event, listing --mcp-config entries skipped by config validation.
  • The workflowSizeGuideline settings key was added, allowing the advisory Dynamic workflow size guideline to be set from any settings file.

Context

According to the Claude Code changelog, these updates introduce new functionalities and address existing issues within the platform. The additions aim to enhance control over network access in sandboxed environments and improve configuration management.

Why It Matters

The introduction of Claude Opus 5 provides users with a more powerful default model for code-related tasks, potentially improving performance and efficiency. The new sandbox and configuration settings offer developers greater control and transparency over their development environments.

What To Do

  • Note the new pricing structure for Claude Opus 5's fast mode.
  • Review the sandbox.network.strictAllowlist setting for managing network access in sandboxed commands.
  • Explore the workflowSizeGuideline settings key for configuring dynamic workflow size guidelines.
  • Watch for startup warnings related to mcp_server_errors if using --mcp-config entries.

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