Anthropic Blocks Claude Subscription Access for OpenClaw and Third-Party Tools

Starting April 4, 2026, Anthropic discontinued support for third-party harnesses, specifically the open-source framework OpenClaw, under its standard Claude Pro and Max subscriptions. The company stated that these tools impose an "oversized burden" on its systems and violate terms of service, as flat-rate subscriptions were not designed for the high token consumption of autonomous agents. To maintain access, users must now employ a pay-as-you-go API key or purchase discounted usage bundles.

Boris Cherny, head of Claude Code, attributed the shift to engineering constraints and the need to prioritize capacity for official products and APIs. To ease the transition, Anthropic offered a one-time credit equal to a monthly subscription fee and the option for full refunds for those wishing to cancel. The move follows a surge in Claude's popularity and coincides with the company's strategic push toward proprietary tools like Claude Code and Claude Cowork.

OpenClaw creator Peter Steinberger, who recently joined OpenAI, criticized the timing, suggesting Anthropic is locking out open source after copying popular features. Steinberger and board member Dave Morin attempted to negotiate with the company, succeeding only in delaying the cutoff by one week. In contrast, OpenAI CEO Sam Altman emphasized the importance of supporting open source in a multi-agent future, while OpenAI pledged continued support for the OpenClaw foundation.