AnthropicLaunchDevelopersNovember 2, 2026

Anthropic adds message threads to Claude Messages API

Read original source →claude.com

Message threads, in public beta, let agents send only new messages plus the previous response ID instead of resending full history. With it on by default for most Claude Code users, 500k–1M token requests saw median time-to-first-token drop about 35%.

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