release
Anthropic SDK v0.104.0
May 21, 2026
v0.104.0 adds support for a beta thinking-token-count feature in the API, exposing estimated token counts in thinking block deltas during streaming. This matters because it gives developers more granular visibility into reasoning usage while responses are still being streamed.
0.104.0 (2026-05-21) Full Changelog: v0.103.1...v0.104.0 Features api: Add support for thinking-token-count beta for estimated tokens in thinking block deltas when streaming ( 80d0fdf )
Source: github.com