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Anthropic Python SDK Hits v1.0 and Swaps httpx for httpx2
The Claude Platform release notes for 2026-08-20 announce Python SDK v1.0, whose HTTP layer moves from `httpx` to httpx2, an API-compatible maintained fork. v1.0 requires Python 3.10+, removes the legacy Text Completions API, drops `temperature`, `top_p` and `top_k` from Messages methods, requires `await response.parse()` for async `.with_raw_response`, and makes `AnthropicBedrock` error instead of defaulting to `us-east-1` when no region is set. If you patch httpx for tracing or mocking, you must call `httpx2.alias_httpx()` at startup or your instrumentation goes silently dead.
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