Claude users will now have to pay more to use third-party tools like the viral AI assistant OpenClaw, Anthropic announced. The news came via email from Anthropic to Claude subscription holders. It was posted on Hacker News and states that as of April 4 at 12 p.m. PT, subscribers will "no longer be able to use your Claude subscription limits for third-party harnesses [tools] including OpenClaw. You can still use them with your Claude account, but they will require extra usage, a pay-as-you-go option billed separately from your subscription." SEE ALSO: Anthropic makes the case for anthropomorphizing AI in ‘unsettling’ research paper Head of Claude Code, Boris Cherny , said the same on X on Friday, and mentioned these tools can also be used with an API key. He shared an explanation for the change: "We've been working hard to meet the increase in demand for Claude, and our subscriptions weren't built for the usage patterns of these third-party tools.…