OpenAI reported $6.7 billion in second-quarter revenue, an increase of 18% from the previous quarter, but the company was overtaken by rival Anthropic, which more than doubled its own quarterly revenue and became the highest-revenue frontier AI company for the first time.
The results underscore how rapidly competition among leading AI developers is intensifying as enterprise adoption accelerates and demand for advanced models continues to grow.
Anthropic Pulls Ahead
While OpenAI continued delivering strong growth, Anthropic expanded at a significantly faster pace during the quarter.
The Claude developer more than doubled its revenue compared with the previous quarter, allowing it to surpass OpenAI in quarterly sales for the first time.
The milestone reflects Anthropic’s rapid expansion in enterprise AI, where businesses continue increasing spending on large language models for coding, customer service, research, and productivity applications.
OpenAI Halts Major AI Training Cycle
Alongside its financial results, OpenAI disclosed that it has paused the largest planned training run for one of its next-generation AI models.
According to the company, the decision was driven by growing cybersecurity risks, following recent security incidents involving OpenAI and Hugging Face, as well as internal evaluations suggesting that the upcoming Astra model could reach capabilities that require additional safeguards before full-scale training continues.
Rather than proceeding immediately, OpenAI will continue training and evaluating the model on a smaller scale while testing new safety systems.
Security Measures Intensify
OpenAI has also introduced additional protections around its most advanced AI systems.
The company said it has restricted internet access for certain research models and strengthened monitoring designed to detect attempts involving cyberattacks, data theft, or efforts to bypass model safety mechanisms.
The new safeguards are intended to better understand the behavior of increasingly capable AI systems before they are deployed more broadly.
AI Competition Enters a New Phase
The latest developments illustrate how the AI race is no longer focused solely on model performance.
Leading companies are now competing across revenue growth, enterprise adoption, computing infrastructure, and increasingly sophisticated safety systems.
As frontier AI models become more capable, developers face growing pressure to balance rapid commercial expansion with responsible deployment and cybersecurity protections.
For investors, the quarter highlighted two defining trends: Anthropic’s accelerating commercial momentum and OpenAI’s increasing focus on safety as the capabilities of next-generation AI models continue to advance.
