Anthropic Python SDK v1.9.0 adds claude-sonnet-5-5 and between_tools thinking
Anthropic released anthropic-sdk-python v1.9.0, adding the claude-sonnet-5-5 model ID and a between_tools thinking type. The update also makes cache diagnostics generally available on Message and MessageCreateParams, adds typed event values to Managed Agents event filters, and lets tool calls optionally run while replies stream.
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