Explosive Usage: Anthropic revokes ChatGPT-maker OpenAI’s access to Claude; says OpenAI’s technical staff were using our coding tools to…

Anthropic has cut off OpenAI’s API access to its Claude family of AI models, citing violations of terms of service after discovering the ChatGPT-maker was using Claude’s coding capabilities to develop its upcoming GPT-5 model, according to a Wired report.

“Claude Code has become the go-to choice for coders everywhere, and so it was no surprise to learn OpenAI’s own technical staff were also using our coding tools ahead of the launch of GPT-5,” Anthropic spokesperson Christopher Nulty told Wired. “Unfortunately, this is a direct violation of our terms of service.”