Anthropic SDK Python v1.0.0 repo
First major stable release of the official Anthropic Python SDK. Upgrades the HTTP transport layer from httpx v0.x to httpx v2, with breaking changes documented in MIGRATION.md.
What it does for you: Every Axion script and Hermes routine that imports the anthropic package must migrate to v1.0.0 to stay on the supported SDK path. The main changes are in client initialization and async transport configuration: MIGRATION.md lists them with before-and-after examples. Running 0.x alongside 1.0.0 is not supported long-term, and 0.x will enter maintenance mode once 1.0.0 stabilizes.
In practice: Long-overdue 1.0 milestone. The httpx2 upgrade brings better connection pooling and HTTP/2 keepalive. The breaking changes are narrow and mechanical rather than architectural.
For: Both runtimes. Core dependency for every Axion and Hermes component that calls the Anthropic API; the migration applies to both runtimes equally.
Verdict: build now. Direct dependency for Axion and Hermes. MIGRATION.md is available and the changes are well-scoped. Block any new Axion module on v1.0.0 and migrate existing call sites in order of call frequency.
Build #1 Anthropic SDK Python v1.0.0: use the ai-implementation-build-intake skill to build this safely. Source: https://github.com/anthropics/anthropic-sdk-python/releases/tag/v1.0.0. Save canonical skill/agent under AXION\Skills and AXION\Agents.
Source · Released 2026-08-20. First 1.x release after 122 prior versions in the 0.x series. MIGRATION.md covers 3 breaking change areas: httpx2 transport init, async client teardown, and proxies config format. Apache-2.0 license.