Claude Sonnet 5.5 (High) opens in Arena Direct Mode for 48 hours

Starting September 30 at 8am PT, Anthropic’s Claude Sonnet 5.5 will be available to test directly on Arena. Once access is live, it can be selected from the Direct Mode dropdown.

Claude Sonnet 5.5 (High) will be available in Direct Mode for 48 hours. After that window, it will remain available in Battle and Agent Mode, where it is already available.