release
Anthropic SDK v0.95.0
April 14, 2026
v0.95.0, released on 2026-04-14, marks Sonnet 4 and Opus 4 as deprecated and changes the Bedrock mantle client to use an auth header. The deprecation signals a model lifecycle shift for Anthropic’s 4-series models, while the auth-header change is a backend integration update for Bedrock users.
0.95.0 (2026-04-14) Full Changelog: v0.94.1...v0.95.0 Features api: mark Sonnet and Opus 4 as deprecated ( 0c1e773 ) bedrock: use auth header for mantle client ( #1644 ) ( 3b93090 )
Source: github.com