thenewstack.io/anthropic-claude-message-threads Anthropic speeds up Claude Code with message threads. But your token bill stays the same.
Anthropic released message threads in public beta for its Messages API; it can cut median time to first token by roughly 35% on Claude Code requests of 500,000 to 1 million tokens by resending only new messages. Token usage remains unchanged and API costs do not inherently fall; threads expire after five minutes idle.
