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3w ago

Anthropic Revokes OpenAI’s Claude Access and Unveils Opus 4.1

Anthropic is using API restrictions as strategic leverage to reinforce its coding lead with Claude Opus 4.1’s benchmark-leading performance.

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Illustration: Aïda Amer/Axios
Anthropic’s Dario Amodei and Daniela Amodei. Image: Anthropic

Overview

  • On August 1, Anthropic revoked OpenAI’s general access to its Claude API, citing a terms-of-service breach for using the model to develop GPT-5.
  • The company said it will preserve limited API use for benchmarking and safety evaluations despite removing broader access.
  • OpenAI’s chief communications officer called peer benchmarking industry standard and lamented that Anthropic retains full access to OpenAI’s API even as OpenAI has been cut off.
  • Claude Opus 4.1 went live August 5 on Claude.ai, Anthropic’s API, Amazon Bedrock and Google Cloud’s Vertex AI with unchanged pricing.
  • The new model scored 74.5% on the SWE-bench Verified benchmark—outperforming OpenAI’s o3 at 69.1%—and drew praise for clean multi-file code refactoring from GitHub and Rakuten.