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Claude Code 2.1.229 adds SSE keepalive pings to fix gateway stream timeouts

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Anthropic released Claude Code version 2.1.229 on August 12 UTC, introducing SSE keepalive pings designed to prevent idle-timeout disconnections during extended model-thinking pauses. The fix targets gateway streaming responses routed through Google Vertex AI and Amazon Bedrock upstreams. Teams using enterprise LLM gateways or direct provider connections are advised to upgrade the Claude Code client and verify the fix by testing a workload that previously failed with a stream idle timeout error. Anthropic clarified that the patch addresses only streaming liveness and does not resolve unrelated issues such as expired credentials, provider quotas, or buffering reverse proxies. Platform and developer-experience teams are cautioned to test one variable at a time to accurately attribute any improvements in streaming reliability.

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