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Anthropic Blocks OpenAI from Using Claude Models Over Terms Violation
August 2, 2025
Tensions between leading AI companies have escalated as Anthropic has officially cut off OpenAI’s access to its Claude AI models, citing a breach of its terms of service.
According to reports, OpenAI had been using Claude to test and compare performance against its own models in areas such as writing, coding, and safety. In a statement, Anthropic alleged that OpenAI staff were also using Claude’s coding tools in preparation for the launch of GPT-5 — a move the company claims directly violated its commercial terms, which prohibit using Claude to build competing services.
Despite revoking full access, Anthropic said it will still allow OpenAI to use Claude models for “benchmarking and safety evaluations.”
In response, an OpenAI spokesperson defended the company's usage of Claude, calling it “industry standard.” While expressing disappointment over the revoked access, they noted that OpenAI’s own API remains open to Anthropic.
This isn’t the first time Anthropic has taken a hard line against competitors. Chief Science Officer Jared Kaplan previously defended the decision to block access to Windsurf — a startup later acquired by Cognition and rumored to be an OpenAI target — by saying it would be “odd” to sell Claude services to a direct rival.
The episode highlights growing competitive frictions in the AI sector, as companies fiercely guard their models and data amid a race to lead the next generation of intelligent systems.
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