Anthropic blocks Windsurf’s Claude API amid OpenAI takeover rumors

Anthropic‘s sudden termination of Windsurf‘s access to Claude 3.x models creates significant disruption amid OpenAI’s reported acquisition plans. This competitive clash between major AI companies highlights the strategic importance of model access in the rapidly consolidating AI tools market, where partnerships and acquisitions increasingly determine which companies can leverage the most powerful AI capabilities.

The big picture: Anthropic has cut off Windsurf’s direct access to Claude 3.x models with less than five days’ notice, creating service disruptions as OpenAI reportedly moves to acquire the AI coding platform for $3 billion.

• Windsurf CEO Varun Mohan announced the restriction on Tuesday via X, noting that the company had been willing to pay for full capacity but was rebuffed.
• The timing aligns with Bloomberg’s May 6 report that OpenAI agreed to acquire Windsurf, in what would be OpenAI’s largest acquisition to date.

Why this matters: The sudden restriction appears strategically timed to prevent OpenAI from gaining access to Claude’s capabilities through the Windsurf acquisition, highlighting the intensifying competition between major AI model providers.

• The targeted nature of the restriction is evident as other AI coding platforms reportedly maintain their Claude access.

Windsurf’s response: To mitigate disruption, Windsurf has implemented alternative AI models while maintaining limited Claude access options for users.

• The company now promotes Gemini 2.5 Pro at a reduced 0.75x rate as an alternative.
• Windsurf users can still access Claude models via a bring-your-own-key approach, though with more limited functionality.
• The platform’s GPT-4.1 and other model integrations remain unaffected by Anthropic’s decision.

Between the lines: This move signals Anthropic’s unwillingness to have its models potentially enhance a competitor’s offerings, suggesting AI companies are becoming increasingly protective of their model access as the industry consolidates.