release
Anthropic SDK v0.120.0
July 25, 2026
v0.120.0, released on 2026-07-24, adds the Claude Opus 5 model, tool addition/removal blocks with tool_change events, and expanded client-side fallback credit token types plus a new server-side fallbacks default option. These API changes broaden model support and make tool orchestration and fallback behavior more explicit for client and server integrations.
0.120.0 (2026-07-24) Full Changelog: v0.119.0...v0.120.0 Features api: add claude-opus-5 model ( bf4e31c ) api: add tool addition/removal blocks and tool_change events ( bf4e31c ) api: expand client-side fallback credit token types and add server-side fallbacks default option ( bf4e31c )
Source: github.com