Claude Code 2.1.251 release notes

Version

2.1.251

Released

28 August 2026

Status

Stable release

What's new in Claude Code 2.1.251

The official notes for Claude Code 2.1.251 list 71 changes: 5 new features, 40 fixes, 2 security changes and 24 other changes.

• 5 new features
• 40 fixes
• 2 security changes
• 24 other changes

Highlights

• security change Changed server-managed settings that terminate sandbox TLS, route sandbox traffic through your own proxy, inject credentials, or weaken sandbox isolation…
• security change Changed ANTHROPIC_CUSTOM_HEADERS from managed or project settings to require approval when it sets a credential, org/tenant, routing, or API-behavior header…
• new feature Added PreModelSwitch and PostModelSwitch hook events (block, confirm, or annotate a model switch); SessionStart resume hooks now receive session staleness…
• new feature Added live streaming of a foreground subagent's tool calls and results to Remote Control clients (background subagents, the default, still…
• new feature Added a Spend limit bar to /usage and a rate_limits.spend_limit status line field for developers behind a Claude apps gateway…

Our short summary: changes are counted and classified automatically from the official notes, and highlights are shortened. The complete, authoritative list is in the official release notes on GitHub.

Full release notes on GitHub (Claude Code 2.1.251)

All Claude Code release notes · All releases

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