release
Anthropic SDK v0.95.0
April 15, 2026
v0.95.0, released on 2026-04-14, marks Sonnet and Opus 4 as deprecated and changes the Bedrock Mantle client to use an auth header. Deprecating two Claude 4 models signals a shift in supported model tiers, while the Bedrock auth change affects how clients authenticate in production integrations.
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