Windsurf, a startup recently in the spotlight due to rumors of its acquisition by OpenAI, reported a sudden change in its collaboration with Anthropic. It turned out that Anthropic almost without warning restricted Windsurf’s direct access to its popular AI models Claude 3.7 Sonnet and Claude 3.5 Sonnet, leaving the company searching for alternative solutions.
With less than five days of notice, Anthropic decided to cut off nearly all of our first-party capacity to all Claude 3.x models. Given the short notice, we may see some short-term Claude 3.x model availability issues as we have very quickly ramped up capacity on other inference…
— Varun Mohan (@_mohansolo) June 3, 2025
Windsurf CEO Varun Mohan openly expressed disappointment with Anthropic’s actions, emphasizing the short notice and unwillingness to change the terms of cooperation. The Windsurf team has already begun urgently connecting third-party providers, but acknowledges that this is not enough for full platform operation.
This move was particularly unexpected because previously, during the launch of the new line of Claude 4 models, Anthropic also did not provide Windsurf with direct access. For users, this means a more complex and expensive path to the advanced capabilities of Claude 4, while competitors — Cursor, Devin by Cognition, and GitHub Copilot — received direct access from the start.
The rapid growth of Windsurf, which reached an annual revenue of one hundred million dollars in April, has faced new challenges. Users are already publicly expressing dissatisfaction with the difficulties in working with Claude, and the startup is trying to maintain its position by allowing the connection of their own Anthropic API keys.
