Several of you have requested access to the latest models from Anthropic, Claude 3.5 Haiku and Claude 3.5 Sonnet. These releases included upgrades to speed, accuracy, and overall performance, and we just added them both to Sudowrite.

Haiku remains Anthropic's fastest and most cost-effective model, and the 3.5 upgrade gave it the chops for even more logically demanding tasks. Sonnet 3.5 was already impressive, but it received a modest upgrade to its instruction-following and creative abilities.

Claude 3.5 Haiku is now available in Write (Auto & Guided), the Chapter Generator, and Plugins. The latest version of Claude 3.5 Sonnet is currently exclusively available in Plugins, as claude-3-5-sonnet-20241022.