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breaking-changes
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Sep 29, 2026
Anthropic SDK Releases — August–September 2026 (Python v1.1–v1.9, TypeScript sdk-v0.121–v0.129 + Bedrock/Vertex/Foundry)
anthropic-sdk
python
typescript
opus-5-5
sonnet-5-5
cache-diagnostics
managed-agents
auto-mode
organization-api
admin-api
files-api
skills-api
tool-runner
compaction
thinking
webhooks
breaking-changes