Monday, August 18, 2025

Anthropic Suspends OpenAI’s API Access to Claude, Citing Violations Ahead of GPT-5 Release

In a significant escalation of the AI arms race, Anthropic revoked OpenAI’s access to its Claude models on August 1, 2023, accusing OpenAI of violating service terms by using its API to develop GPT-5. Anthropic’s spokesperson claimed this usage was expressly forbidden, framing it as a “direct violation.” OpenAI countered, asserting that evaluating rival AI systems is an “industry standard” crucial for benchmarking and safety improvements. The feud reflects contrasting interpretations of competitive practices in the AI landscape. Anthropic’s actions mirror previous strategic moves, such as cutting off API access to the startup Windsurf, highlighting a pattern of using technology access as a competitive lever. This conflict unfolds as OpenAI approaches the high-stakes launch of GPT-5, amid pressures following mixed responses to its prior model, GPT-4.5, emphasizing the escalating tensions and strategic maneuvers shaping the AI ecosystem in a rapidly evolving market.

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