OpenAI reported second-quarter revenue of $6.7 billion [1], representing an 18% increase over the previous quarter [2].

The figures have sparked concern among investors who view the growth as tepid when compared to the rapid expansion of competitor Anthropic. This divergence suggests that the early market leader may be facing stiffer competition for enterprise and consumer AI adoption.

OpenAI generated $5.7 billion in sales during the first quarter of 2026 [4]. The rise to $6.7 billion [1] in the three-month period ending June 2026 marks a steady increase, but it falls short of the trajectory seen by other players in the generative AI space.

During the same period, Anthropic's sales doubled [3]. This 100% increase [3] highlights a significant gap in growth rates between the two companies, despite OpenAI's larger overall revenue base.

OpenAI said its growth would accelerate in the third quarter [2]. The company has attempted to reassure investors that the second-quarter performance does not signal a long-term slowdown in its ability to monetize its models.

Investors said they were disappointed that the growth lagged behind Anthropic's surge [2]. The disparity in growth rates has shifted the conversation toward whether OpenAI can maintain its dominance as the AI market matures, and more alternatives become available to businesses.

OpenAI reported second-quarter revenue of $6.7 billion

The contrast in growth rates indicates a shift in the AI competitive landscape. While OpenAI remains the larger entity by total revenue, Anthropic's ability to double its sales suggests it is successfully capturing new market share. This puts pressure on OpenAI to prove that its scale provides a sustainable moat against agile competitors.