https://www.wired.com/story/anthropic-revokes-openais-access-to-claude/ Skip to main content Wired SECURITY POLITICS THE BIG STORY BUSINESS SCIENCE CULTURE REVIEWS Wired Newsletters Security Politics The Big Story Business Science Culture Reviews More The Big InterviewMagazineThe New Era of Business TravelEventsWIRED InsiderWIRED Consulting Newsletters Podcasts Video Merch Search Sign In Sign In Kylie Robison Business Aug 1, 2025 5:41 PM Anthropic Revokes OpenAI's Access to Claude OpenAI lost access to the Claude API this week after Anthropic claimed the company was violating its terms of service. * * * * Image may contain Electronics Mobile Phone Phone Art and Paper Photo-Illustration: Wired Staff/Getty Images Save this story Save this story All products featured on WIRED are independently selected by our editors. However, we may receive compensation from retailers and/or from purchases of products through these links. Anthropic revoked OpenAI's API access to its models on Tuesday, multiple sources familiar with the matter tell WIRED. OpenAI was informed that its access was cut off due to violating the terms of service. "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 said in a statement to WIRED. "Unfortunately, this is a direct violation of our terms of service." According to Anthropic's commercial terms of service, customers are barred from using the service to "build a competing product or service, including to train competing AI models" or "reverse engineer or duplicate" the services. This change in OpenAI's access to Claude comes as the ChatGPT-maker is reportedly preparing to release a new AI model, GPT-5, which is rumored to be better at coding. OpenAI was plugging Claude into its own internal tools using special developer access (APIs), instead of using the regular chat interface, according to sources. This allowed the company to run tests to evaluate Claude's capabilities in things like coding and creative writing against its own AI models, and check how Claude responded to safety-related prompts involving categories like CSAM, self-harm, and defamation, the sources say. The results help OpenAI compare its own models' behavior under similar conditions and make adjustments as needed. "It's industry standard to evaluate other AI systems to benchmark progress and improve safety. While we respect Anthropic's decision to cut off our API access, it's disappointing considering our API remains available to them," OpenAI's chief communications officer Hannah Wong said in a statement to WIRED. Nulty says that Anthropic will "continue to ensure OpenAI has API access for the purposes of benchmarking and safety evaluations as is standard practice across the industry." The company did not respond to WIRED's request for clarification on if and how OpenAI's current Claude API restriction would impact this work. Top tech companies yanking API access from competitors has been a tactic in the tech industry for years. Facebook did the same to Twitter-owned Vine (which led to allegations of anticompetitive behavior) and last month Salesforce restricted competitors from accessing certain data through the Slack API. This isn't even a first for Anthropic. Last month, the company restricted the AI coding startup Windsurf's direct access to its models after it was rumored OpenAI was set to acquire it. (That deal fell through). Anthropic's chief science officer Jared Kaplan spoke to TechCrunch at the time about revoking Windsurf's access to Claude, saying, "I think it would be odd for us to be selling Claude to OpenAI." A day before cutting off OpenAI's access to the Claude API, Anthropic announced new rate limits on Claude Code, its AI-powered coding tool, citing explosive usage and, in some cases, violations of its terms of service. You Might Also Like ... * In your inbox: Five new newsletters by deeply sourced experts * The EVs we've lost * Big Story: AI chatbots and the humans who love them * Snake venom, urine, and a quest to live forever * Uncanny Valley: An insider look at the influence of Silicon Valley Kylie Robison is a senior correspondent at WIRED covering the business of artificial intelligence. She was previously a reporter at The Verge, Fortune, and Business Insider. Please send story tips (no PR pitches) to @kylie.01 on Signal. ... Read More Senior correspondent Topicsartificial intelligencealgorithmsAnthropicOpenAIapicoding Read More Cursor's New Bugbot Is Designed to Save Vibe Coders From Themselves Cursor's New Bugbot Is Designed to Save Vibe Coders From Themselves One of the most popular platforms for AI-assisted programming says the next era of vibe coding is all about supercharging error detection. Lauren Goode Microsoft and OpenAI's AGI Fight Is Bigger Than a Contract Microsoft and OpenAI's AGI Fight Is Bigger Than a Contract A key clause in Microsoft and OpenAI's deal embodies the raging divide between AGI true believers and those who think it's still a long ways off. Steven Levy Elon Musk Unveils Grok 4 Amid Controversy Over Chatbot's Antisemitic Posts Elon Musk Unveils Grok 4 Amid Controversy Over Chatbot's Antisemitic Posts In a livestream with xAI colleagues, the billionaire entrepreneur described current AI systems as "primitive" and not for "serious" commercial use. Paresh Dave OpenAI Poaches 4 High-Ranking Engineers From Tesla, xAI, and Meta OpenAI Poaches 4 High-Ranking Engineers From Tesla, xAI, and Meta The new hires are joining OpenAI's scaling team, according to an internal Slack message sent by cofounder Greg Brockman. Will Knight OpenAI's New CEO of Applications Strikes Hyper-Optimistic Tone in First Memo to Staff OpenAI's New CEO of Applications Strikes Hyper-Optimistic Tone in First Memo to Staff Soon-to-be former Instacart CEO Fidji Simo sent a memo to OpenAI staff Monday laying out her vision for how AI will change the world. Kylie Robison OpenAI Seeks Additional Capital From Investors as Part of Its $40 Billion Round OpenAI Seeks Additional Capital From Investors as Part of Its $40 Billion Round OpenAI, which recently announced a $40 billion round of financing, is seeking funding from new and existing investors to fulfill the deal. Lauren Goode Trump's Defiance of TikTok Ban Prompted Immunity Promises to 10 Tech Companies Trump's Defiance of TikTok Ban Prompted Immunity Promises to 10 Tech Companies Newly disclosed records show Attorney General Pam Bondi gave cover to not only Apple and Google, but also several other companies that help TikTok operate in the US. Paresh Dave Apple Sues the YouTuber Who Leaked iOS 26 Apple Sues the YouTuber Who Leaked iOS 26 In a lawsuit filed against prominent leaker Jon Prosser, Apple alleges a conspiracy to break into a development device and steal its trade secrets. Prosser insists Apple has it all wrong. Boone Ashworth Roblox's New Age Verification Feature Uses AI to Scan Teens' Video Selfies Roblox's New Age Verification Feature Uses AI to Scan Teens' Video Selfies Roblox will scan video selfies of teens to assess their ages as part of a new Trusted Connections feature that gives users access to unfiltered chatting with people they know. Megan Farokhmanesh Trump's AI Action Plan Is a Crusade Against 'Bias'&-and Regulation Trump's AI Action Plan Is a Crusade Against 'Bias'--and Regulation The Trump administration's new AI policy blueprint calls for limited regulation and lots of leeway for Big Tech to grow even bigger. Will Knight Microsoft, OpenAI, and a US Teachers' Union Are Hatching a Plan to 'Bring AI into the Classroom' Microsoft, OpenAI, and a US Teachers' Union Are Hatching a Plan to 'Bring AI into the Classroom' The National Academy for AI Instruction will make artificial intelligence training accessible to educators across the country. Paresh Dave Microsoft Put Older Versions of SharePoint on Life Support. Hackers Are Taking Advantage Microsoft Put Older Versions of SharePoint on Life Support. Hackers Are Taking Advantage Multiple hacking groups--including state actors from China--have targeted a vulnerability in older, on-premises versions of the file-sharing tool after a flawed attempt to patch it. Lily Hay Newman WIRED WIRED is where tomorrow is realized. It is the essential source of information and ideas that make sense of a world in constant transformation. The WIRED conversation illuminates how technology is changing every aspect of our lives--from culture to business, science to design. The breakthroughs and innovations that we uncover lead to new ways of thinking, new connections, and new industries. More From WIRED * Subscribe * Newsletters * Travel * FAQ * WIRED Staff * WIRED Education * Editorial Standards * Archive * RSS * Accessibility Help Reviews and Guides * Reviews * Buying Guides * Mattresses * Electric Bikes * Soundbars * Streaming Guides * Wearables * TVs * Coupons * Gift Guides * Advertise * Contact Us * Manage Account * Jobs * Press Center * Conde Nast Store * User Agreement * Privacy Policy * Your California Privacy Rights (c) 2025 Conde Nast. All rights reserved. WIRED may earn a portion of sales from products that are purchased through our site as part of our Affiliate Partnerships with retailers. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Conde Nast. Ad Choices Select international site United States * Italia * Japon * Czech Republic & Slovakia * * * * * *