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Claude Python SDK v1.0 moves to httpx2 and requires Python 3.10

UpdateVerified

The Python SDK v1.0 switches its HTTP layer to httpx2, an API-compatible httpx fork, requires Python 3.10 or later and removes long-deprecated surface including the legacy Text Completions API. Tracing or mocking libraries that patch httpx need httpx2.alias_httpx().

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Also shipped Aug 20, 2026Anthropic in August 2026 →

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Files API is out of beta on the Claude API

/v1/files and Messages requests referencing uploaded files no longer need the files-api-2025-04-14 header. Headerless requests get file expiration via expires_in_seconds, page-based pagination and an ids[] filter; requests with the header keep working.

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