Anthropic opens public beta of message threads for the Claude API

According to a report by The Next Web on November 3, 2026, Anthropic has introduced message threads in public beta for its API. With the feature enabled, an Agent sends the full conversation only once in its initial request, then transmits just the new messages afterward. Anthropic states that this approach reduces the wait before Claude starts replying by roughly 35% during very long sessions, while pricing and rate limits remain unchanged. So far only this single report is available, meaning the rollout is currently at the public beta stage, with no additional milestones confirmed. message threads targets developers building Agent workflows that involve prolonged back-and-forth exchanges, where resending the entire context on every turn would otherwise compound latency. Because pricing and rate limits are said to stay the same, the benefit is framed purely as a performance improvement rather than a structural change to how calls are billed. No timeline has been disclosed for when the beta might become generally available, and no further details on functionality or adoption have been published. Based solely on the available coverage, the situation stands at the public beta announcement, leaving questions about broader availability, potential refinements, and uptake among developers unanswered for now. Additional sources would be needed to confirm whether the feature has progressed beyond beta or whether Anthropic has adjusted its claims.