TL;DR

• Default model switches to Claude Sonnet 5 on update. Promotional pricing ($2/$10 per Mtok) runs through August 31; the native 1M context window matches Opus, so context-heavy workflows carry over without change.

New in 2.1.197

2.1.197 (July 1, 2026)

• Introducing Claude Sonnet 5: now the default model in Claude Code, with a native 1M-token context window and promotional pricing of $2/$10 per Mtok through August 31. Update to version 2.1.197 for access. https://www.anthropic.com/news/claude-sonnet-5