Anthropic blocks OpenAI from accessing Claude models over alleged contract breach
Summary
Anthropic blocked OpenAI from accessing Claude models through its API after alleging a contract breach. The company said OpenAI’s technical teams used Claude Code for internal testing ahead of GPT-5, which Anthropic says violated its terms of use. Anthropic will still allow API access for benchmarking and safety evaluations, but it has not said whether that remains true for OpenAI. The dispute highlights intensifying competition between AI model providers, especially in coding and model comparison workflows. The article also notes Anthropic previously restricted Claude access after OpenAI-related acquisition activity around Windsurf.
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Anthropic
$10M to $25M