Anthropic vs OpenAI: How Claude maker’s growth is challenging ChatGPT ahead of IPO

Anthropic and OpenAI are engaging in a fierce competition for enterprise AI customers, with both companies experiencing rapid revenue growth. In the first half of 2026, Anthropic reported revenue of $16.29 billion, while OpenAI's quarterly revenue was $6.7 billion, according to Reuters. However, the comparison between the two companies is not straightforward due to differences in how they account for sales through cloud partners.

Anthropic's revenue surged to $4.59 billion in 2025 from $386 million in 2024, driven by strong demand for its Claude models, particularly its coding tools. These tools assist software developers in writing, reviewing, and fixing code, as well as automating tasks and building AI-powered applications. In contrast, OpenAI has expanded its offerings beyond ChatGPT to include business software, developer tools, and AI agents, with an annualized revenue run rate estimated at nearly $50 billion.

When evaluating the companies, investors must consider factors beyond just sales growth. Both Anthropic and OpenAI face significant financial risks, as they have both reported operating losses. Anthropic's operating loss in the first half of 2026 was $693 million, while its net loss was a staggering $80.7 billion, largely due to non-cash accounting charges related to the estimated value of bonds that may eventually convert into company shares.

OpenAI, too, faces heavy spending requirements, with estimates suggesting it will require around $278 billion in cash between 2026 and 2030 to invest in computing power and infrastructure.

The companies also depend on cloud providers and strategic partnerships, which exposes them to potential vulnerabilities. Anthropic's reliance on Amazon and Google for computing infrastructure and access to business customers, as well as its status as an investor and competitor to OpenAI, could be a double-edged sword. On the other hand, OpenAI's close relationship with Microsoft and substantial investments in computing capacity could provide it with a competitive edge.

As both companies seek valuations reflecting expectations of future growth, Anthropic has been valued at around $1.5 trillion by some investors, while OpenAI has been linked to potential valuations exceeding $1.4 trillion. However, these private-market valuations are not necessarily reflective of the final prices at which shares will be offered to public investors.

Investors must carefully assess the growth potential and revenue generation capabilities of each company to determine which one is better positioned for long-term success.