OpenAI

In a consequential move within the rapidly evolving artificial intelligence sector, Anthropic has suspended OpenAI’s access to its Claude API, citing violations of its terms of service. The decision follows Anthropic’s discovery that OpenAI engineers had been using Claude’s coding features—known as Claude Code—at a critical time preceding the expected launch of OpenAI’s next flagship model, GPT-5.

In a pivotal shift within the artificial intelligence landscape, Anthropic has surpassed OpenAI to become the foremost provider of large language models (LLMs) for business applications as of mid-2025. According to multiple industry analyses, Anthropic now holds 32% of enterprise LLM usage—up from just a fraction two years ago—while OpenAI’s share has dropped to 25% after previously leading the sector with a commanding 50% share.