
Anthropic has just announced Claude Haiku 4.5, a new lightweight AI model that’s fast enough to power real-time experiences and smart enough to rival its bigger sibling, Claude Sonnet 4. And in a major move, it’s available for free to all claude.ai users starting today.
Just two weeks after rolling out Sonnet 4.5, Anthropic's latest launch promises superior intelligence wrapped in a lightweight package that supports chatting, coding and workflows.