Anthropic's Message Threads cut time to first token by 35 percent for long conversations Matthias Bastian View the LinkedIn Profile of Matthias Bastian Nov 3, 2026 Anthropic released Message Threads as a public beta on its Claude platform. Until now, every API request had to resend the entire conversation history. Message Threads only transmits what's changed since the last message, cutting time to first token by about 35 percent for requests between 500,0