Anthropic has revoked OpenAI’s access to its Claude family of models, according to a Wired report. OpenAI was connecting its own internal tools to Claude to allow the company to compare Claude’s performance to its own models in categories like coding, writing, and safety, according to the report.

Anthropic has officially stopped OpenAI from using its Claude models. This decision came after reports revealed that OpenAI had been using Claude in ways that Anthropic says broke the rules. According to a report by Wired, OpenAI had connected Claude to some of its internal tools.

An OpenAI spokesperson said the API access allowed for industry-standard benchmarking and safety improvements.

Anthropic has cut off one of its biggest competitors, revoking OpenAI’s access to its Claude family of AI models.

OpenAI lost access to the Claude API this week after Anthropic claimed the company was violating its terms of service.

As reported by Wired, multiple sources claim that OpenAI has been cut off from Anthropic’s APIs. Allegedly, OpenAI was using Anthropic’s Claude Code to assist in creating and testing OpenAI’s upcoming GPT-5, which is due to release in August .

Anthropic has revoked OpenAI's access to its AI models for allegedly violating terms of service. This comes as OpenAI prepares to launch its GPT-5 model. Anthropic allows API access for benchmarking and safety evaluations but restricts use for building competing products.