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OpenAI Python SDK switches default HTTP client to HTTPX2

OpenAI has updated its Python SDK to use HTTPX2 instead of HTTPX for both synchronous and asynchronous HTTP clients, with HTTPX2 now installed automatically alongside the openai package. Existing API calls, streaming, retries and timeout settings keep working without code changes, but the SDK no longer installs the httpx or certifi packages by default.

github.com · 2026-08-28

Pydantic launches HTTPX2, a maintained fork of the HTTPX Python HTTP client

Pydantic has released HTTPX2, a new Python HTTP client library that continues the work of the HTTPX project, offering sync and async APIs, HTTP/1.1 and HTTP/2 support, and an optional command-line client. The project is positioned as a stewardship effort to keep the library actively maintained after HTTPX saw reduced development activity.

github.com · 2026-08-28