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Claude Code sees a 35% reduction in first-token latency for long conversations, with request data volume cut by 99.8%.

1 hours ago

Beating AI News Flash: Anthropic has launched the public beta of Message Threads for its Messages API, reducing the overhead of AI agents that repeatedly upload conversation history. Previously, coding agents had to resend prior messages and tool execution results every time they called Claude. Now, only the full conversation needs to be uploaded initially; subsequent rounds only require sending new messages and the ID of the previous response. The server temporarily stores the history, eliminating the time spent on repeated transmission, validation, and tokenization. This feature is now enabled by default in Claude Code. Anthropic disclosed that for requests with 500,000 to 1,000,000 tokens, the median time to first token decreased by approximately 35%. The median size of a single request for long conversations shrank from around 800KB to 1.8KB, a reduction of roughly 99.8%. However, the model still needs to process the full context, so token usage and costs remain unchanged. Server-stored message threads expire after 5 minutes of inactivity, requiring users to re-upload conversation history at that time.

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