Anthropic launches Message Threads in public beta
What happened
On 3 November 2026, Anthropic launched Message Threads in public beta on the Claude platform. Under this mechanism, API requests no longer resend the full conversation history, transmitting only the changes after the previous message. Anthropic says time to first token drops by about 35% on requests of 500,000 to 1 million tokens, with coding agents, computer-use agents and workflows handling large volumes of documents or images benefiting most. The feature is currently in public beta, with no further progress disclosed.
Written by AI from the reports · updated 3 h ago
Timeline
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- The DecoderAnthropic's Message Threads cut time to first token by 35 percent for long conversations
Anthropic released Message Threads for the Messages API. Instead of resending the entire conversation with every turn, agents now only transmit what's changed. For requests between 500,000 and one million tokens, time to first token drops by about 35 percent.
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