The competition between OpenAI and Anthropic to reach the public markets first is becoming one of the defining forces shaping the AI industry's future. Anthropic filed confidentially with regulators on June 1, beating OpenAI to the punch after months of speculation about which company would list first. The stakes extend far beyond corporate prestige; the IPO race is influencing product timelines, accounting practices, and how investors will value the entire generative AI sector for years to come.

The rivalry between these two companies traces back to late 2020, when Dario Amodei, then OpenAI's vice president of research, left to found Anthropic with a focus on AI safety. That departure was widely seen as a rebuke of Sam Altman's approach at OpenAI. The tension escalated dramatically in late 2022 when OpenAI learned that Anthropic was developing a chatbot. Altman immediately directed his team to fast-track a competing product, and ChatGPT launched just two weeks later on November 30, 2022, becoming the fastest-growing consumer application in history.

Why Is the IPO Race So Consequential for AI's Future?

The companies view going public as more than a fundraising milestone; it's a chance to frame how the entire industry will be valued and to establish their CEO as the leading voice in AI. OpenAI is targeting a valuation around $1 trillion, according to reporting from Reuters. The timing matters enormously because whichever company lists first gets to set the narrative for how frontier AI companies should report their finances to investors.

This creates an unusual situation where two direct rivals are simultaneously raising capital and turning to some of the same investment banks for help. Bankers and advisers are navigating increasingly complex relationships with both companies, with executives at each firm pressing their IPO advisers for insight into the rival's plans. Some banks working with both companies have had to erect internal barriers between deal teams to prevent information leaks.

The accounting dispute between the two companies illustrates how high the stakes have become. OpenAI has told investors and employees that Anthropic's preferred accounting method overstates its revenue by billions of dollars. In April, OpenAI's chief revenue officer, Denise Dresser, told employees that OpenAI considers Anthropic's financials inflated. Anthropic books the full amount that customers pay for its AI services as revenue, while OpenAI reports only net revenue after paying its partner, Microsoft. Anthropic argues it follows established accounting practices and recognizes gross revenue because it is the "principal" in the transaction.

"One reason for Anthropic to try to beat OpenAI out to the public market is that they will get to set the agenda for how a frontier model reports financials and do so in a way that is favorable to their financial model," said Gil Luria, analyst at D.A. Davidson.

Gil Luria, Analyst at D.A. Davidson

How Has the Competition Shaped Product Development?

The rivalry between Altman and Amodei has become the driving force behind how quickly AI tools are released, what features they include, and ultimately how people interact with the technology in their daily lives. The dynamic has shifted multiple times over the past few years. Anthropic spent about three years catching up to OpenAI after Claude launched a few months after ChatGPT. Around late 2024, Amodei redirected researchers to focus on reasoning models after seeing OpenAI's early success there. The dynamic flipped in late 2025 when Anthropic released a powerful update to its Claude Code tool for business customers, prompting OpenAI to redouble its focus on enterprise software and pull more resources into its own coding product, Codex.

"It's all-out war between these guys. Every time there's a new release from Anthropic, the bet will be that OpenAI is soon to follow and vice versa," said Anastasios Angelopoulos, CEO of Arena, a top AI benchmarking and evaluation company.

Anastasios Angelopoulos, CEO of Arena

The pressure to compete has created internal tensions at OpenAI as well. Altman recently clashed with CFO Sarah Friar over whether the company could meet the obligations required for a public listing on such a compressed timeline. Altman reportedly told her to figure it out or hire different bankers and lawyers who could pull it off. Friar has since told advisers that the company's leadership is aligned on timing.

Steps to Understanding the AI Competition Landscape

• Track IPO Filings: Monitor regulatory filings from both OpenAI and Anthropic to understand their financial health, revenue models, and growth trajectories as they prepare for public markets.
• Compare Product Roadmaps: Follow announcements from both companies about new AI models and features to see how competition drives innovation in reasoning models, coding tools, and enterprise software.
• Analyze Accounting Practices: Understand the differences in how these companies report revenue, as the accounting method chosen by the first company to go public may become the industry standard.
• Watch for Strategic Partnerships: Pay attention to which cloud providers and enterprise customers each company partners with, as these relationships directly impact their revenue and competitive positioning.

What Does the Public Feud Reveal About AI Industry Dynamics?

The relationship between the two companies has deteriorated significantly over the past few years. Relations worsened after Altman was unexpectedly fired by OpenAI's board in late 2023. As the board searched for options, directors briefly spoke with Amodei about merging the two labs under his leadership. One former OpenAI executive said the idea was considered "extremely briefly" before the board moved on to other ideas. Even so, news of the proposal infuriated many OpenAI employees.

The feud has become increasingly public. In February, Altman slammed Anthropic's Super Bowl ads as "deceptive" for misrepresenting OpenAI's plans to sell ads on ChatGPT. Later in March, Amodei accused Altman of leveraging Anthropic's dispute with the Pentagon to help OpenAI. At an AI summit in India in February, Indian Prime Minister Narendra Modi encouraged all the tech executives on stage to join hands in a show of unity. In a moment captured in a viral video, Altman and Amodei, standing next to one another, refused.

The IPO race represents a critical inflection point for both companies and the broader AI industry. Whichever company goes public first will establish precedents for valuation, accounting, and corporate governance that other AI companies will likely follow. The stakes are so high that both firms are willing to endure the complexity and cost of simultaneous IPO processes, with internal clashes over timelines and external disputes over accounting practices. For investors, regulators, and AI researchers watching from the sidelines, the outcome of this race will shape how the industry evolves for years to come.

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