In a move that underscores the intensifying rivalries within the artificial intelligence sector, Anthropic has abruptly severed OpenAI’s access to its Claude AI model via API, citing violations of its terms of service. The decision, announced late Friday, comes amid reports that OpenAI engineers were leveraging Claude’s advanced coding tools to refine their upcoming GPT-5 model. According to a spokesperson for Anthropic, this usage directly contravenes prohibitions against employing their technology to develop competing AI systems. OpenAI, for its part, has disputed the claims, stating it was merely conducting benchmarking tests, a common practice in the industry.

The fallout has sent ripples through Silicon Valley, where collaborations between AI firms are increasingly strained by competitive pressures. Anthropic, founded by former OpenAI executives Dario and Daniela Amodei, has positioned itself as a safety-focused alternative, emphasizing ethical AI development. This incident highlights how even nominal partnerships can fracture when billions in venture capital and market dominance are at stake.

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