Message threads is in public beta on the Claude Platform. Today a coding agent resends every earlier message and tool result with each request.
In the News: November 3, 2026 (Morning)
Anthropic's message threads send only new turns to the Messages API; it reports median time to first token down about 35% at 500k to 1M tokens.
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Anthropic says message threads cut median time to first token by about 35% for requests of 500k to 1M tokens
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Kiro's team says it modeled 26 functions of its own agent harness in Lean, proved 70 properties and reproduced 18 bugs on the real code
The authors had the Kiro CLI agent, running Claude Opus 5.5 on Amazon Bedrock, write Lean 4 models of 26 functions across three codebases: the Kiro agent harness, the CLI client and Kiro Crew. The agent then wrote proofs and differential…
Claude Code v2.1.317
Adds onFailure: "block" for Agent SDK hook callbacks, so a callback that fails blocks the action instead of letting it run. Also adds a prompt before a web or shell tool call sends your account email address to the network, and a cost report endpoint on the Claude apps gateway admin API, GET /v1/organizations/analytics/cost.