Anthropic Revokes OpenAI's Access to Claude

Anthropic revoked OpenAI's API access to its Claude models, claiming a violation of its terms of service. The company alleged that OpenAI's technical staff were using Claude's coding tools to help build a competing product, which is forbidden. OpenAI responded that evaluating other AI systems is an industry standard for benchmarking progress and improving safety. This action highlights the competitive tensions between the two AI labs, especially as OpenAI is reportedly preparing to release its next-generation model, GPT-5.