Overview

Claude Code v2.1.42 delivers faster startup and better performance with improved prompt caching and schema optimizations. The release also includes bug fixes for resume functionality and image handling.

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Changes by Version

v2.1.42

  • Added faster startup performance by deferring Zod schema construction
  • Added improved prompt cache hit rates by moving date out of system prompt
  • Added one-time Opus 4.6 effort callout for eligible users
  • Fixed /resume showing interrupt messages as session titles
  • Fixed image dimension limit errors to suggest /compact