Claude Code v2.1.237 ships built-in Concise output style and fixes prompt caching for LLM gateways / custom base URLs
Anthropic
Released Aug 20, 2026. Adds a built-in Concise output style that leads with results and skips narration while preserving thoroughness (selectable under /config → Output style). Fixes prompt caching for users running Claude Code through an LLM gateway or custom base URL — cached prefixes were not surviving gateway-mediated requests, silently re-charging tokens on every turn.
Why it matters
The gateway prompt-cache fix is the materially larger change for enterprise users — teams proxying Claude Code through LiteLLM, Cloudflare AI Gateway, Portkey, or Anthropic-compatible proxies were paying full price for cache hits they thought they had.
Importance: 3/5
Gateway prompt-cache fix materially changes costs
Sources
official
Claude Code v2.1.237 release notes