# Time to first token latency reduction

Anthropic has opened message threads in public beta on the Claude Platform, letting agents send only what is new since the last turn instead of resending the whole conversation history. Previously a coding agent could make hundreds of requests in one session, each carrying every earlier message and tool result, and once a conversation reached hundreds of thousands of tokens that resend added time before Claude began responding. With message threads on by default for most Claude Code users, requests of 500k to 1M tokens see median time to first token drop by about 35%, while Claude still reads the full conversation each turn, so token usage stays the same.

Anthropic has opened message threads in public beta on the Claude Platform, letting agents send only what is new since the last turn instead of resending the whole conversation history. Previously a coding agent could make hundreds of requests in one session, each carrying every earlier message and tool result, and once a conversation reached hundreds of thousands of tokens that resend added time before Claude began responding. With message threads on by default for most Claude Code users, requests of 500k to 1M tokens see median time to first token drop by about 35%, while Claude still reads the full conversation each turn, so token usage stays the same.