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Anthropic rolls out message threads beta for Claude API, speeding up large context responses

By PulseAugur Editorial · [1 sources] ·

Anthropic has introduced a beta feature called message threads for its Claude API, designed to improve response times for large context requests. This new parameter, available by default for Claude Code users, reduces the time to first token by approximately 35% for requests between 500,000 and 1 million tokens. While token usage and pricing remain unchanged, threads are stored in memory and expire after a period of inactivity, requiring a full conversation resend if left idle. AI

IMPACT Potentially speeds up interactions with large context windows, benefiting agent-based applications.

RANK_REASON Product update for an existing AI model API.

Read on r/ClaudeAI →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic rolls out message threads beta for Claude API, speeding up large context responses

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Tool
Product update for an existing AI model API.
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COVERAGE [1]

  1. r/ClaudeAI TIER_2 English(EN) · /u/emarkosov ·

    Anthropic shipped message threads (beta): Claude Code now sends only new messages per turn, about 35% lower time to first token on 500k to 1M token requests

    <!-- SC_OFF --><div class="md"><p>Published Nov 2 on claude.com, so two days old, but I haven't seen it discussed much. Details:</p> <p>- New `thread` parameter on the Messages API, beta header `message-threads-2026-08-12`. The first request sends the full conversation and starts…

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