Anthropic retires Claude Sonnet 4.5 model in 2026, requiring application updates

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Anthropic will retire the Claude Sonnet 4.5 language model on November 30, 2026, with all requests failing after that date. The company announced the retirement on September 30, 2026, recommending users migrate to Claude Sonnet 5.5. The migration requires significant code changes beyond a simple model string swap due to differences in API behavior and token output. Multiple PHP SDKs remain in beta or pre-1.0 versions, contributing to instability in LLM integrations. The article recommends implementing hexagonal architecture patterns to isolate domain logic from frequently changing AI model dependencies.

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