OpenAI Files Confidential S-1 for IPO, Joins Anthropic in AI Public Listing Race

TL;DR

OpenAI submitted a confidential S-1 draft to the SEC on June 8, 2026, officially beginning its journey toward a public listing. The company proactively announced the filing — "We expect it to leak so we're just announcing it" — while cautioning that "it may be a while" before the actual IPO. This follows Anthropic's confidential S-1 filing the previous week, setting up a historic dual-AI-lab IPO race. OpenAI's most recent valuation stands at $852 billion following a $122 billion funding round in March 2026, while Anthropic has since surpassed that at $965 billion.

OpenAI's S-1: What We Know

OpenAI's announcement was characteristically terse. In a short blog post on June 8, the company wrote:

"We recently submitted a confidential S-1. We expect it to leak so we're just announcing it. We have not decided on timing yet; it may be a while because there are things we want to do that are likely easier as a private company."

The filing marks the first official step in what could become the largest technology IPO in history. OpenAI is currently valued at $852 billion post-money, following its record-breaking $122 billion funding round led by Amazon, Nvidia, and SoftBank in March 2026. The company serves 900 million weekly active ChatGPT users and has over 4 million weekly Codex users, according to publicly disclosed metrics.

The OpenAI-Anthropic IPO Race

What makes this filing especially significant is its timing: it comes exactly one week after Anthropic submitted its own confidential S-1. The two rival AI labs are now on parallel tracks to Wall Street, with combined valuations exceeding $1.8 trillion.

Anthropic's valuation surged past OpenAI's after its $65 billion Series H funding round in late May. The company disclosed $47 billion in annualized revenue run-rate during its financing. Both companies are racing not just for public market supremacy, but for investor mindshare in what WIRED has called "one of the most dramatic tech IPO waves ever," alongside SpaceX's parallel public listing preparations.

Why OpenAI Says "It May Be a While

OpenAI's caveat about timing is unusual for a company that has filed its S-1. Confidential filings typically precede an IPO by 6-9 months, but the company explicitly stated it wants to accomplish certain goals as a private entity first.

Several factors likely drive this hesitation:

1. Structural complexity. OpenAI's journey from a non-profit research lab to a for-profit entity involves complex corporate restructuring. The company converted from a capped-profit structure to a traditional for-profit in 2024-2025, but regulatory scrutiny from the SEC around its governance model remains a factor.

2. Business priorities. OpenAI is in the middle of an aggressive expansion: Codex is transforming from a developer tool into an enterprise agent platform (the "Sites and Role Plugins" launch from early June), and the company continues to push into enterprise sales, government contracts, and international markets.

3. Market timing. The broader tech IPO market is heating up, with Anthropic, SpaceX, and potentially other AI companies all targeting 2026-2027 windows. OpenAI may be waiting for more favorable conditions or for its revenue growth to justify its lofty $852 billion valuation in public filings.

What This Means for AI Tool Users

For developers and businesses using OpenAI's tools, the IPO filing carries several implications:

Codex and API stability. As a public company, OpenAI would face quarterly earnings pressures, potentially leading to more aggressive monetization of its API and Codex platform. The recent shift from credits to usage-based billing for Codex is a preview of this dynamic.

Pricing transparency. Public disclosure requirements would force OpenAI to reveal more about its cost structure, compute spending, and customer concentration — information that could help developers optimize their API spending.

Competitive acceleration. The dual IPO race between OpenAI and Anthropic means both companies are under pressure to demonstrate growth, likely driving faster product releases, more competitive pricing, and expanded enterprise features.

The Bigger Picture: AI Infrastructure Goes Public

OpenAI's S-1 is part of a broader migration of AI infrastructure from private markets to public scrutiny. In the span of two weeks, both leading AI labs have filed for IPOs. Alphabet recently announced an $80 billion equity raise for AI infrastructure. The AI capital markets are entering a new phase where the largest players must now answer to public shareholders.

Recommended Reading

If you missed our earlier analysis of the AI IPO wave:

• Anthropic IPO, Alphabet $80B Raise, OpenAI on AWS: AI Capital Markets Collision — Our June 2 analysis of the broader capital markets shift

For practical guides on the tools behind these companies:

• Claude Code + DeepSeek V4 Setup: API Costs Drop 90%
• AI Coding Agent Tech Stack Selection: Language, Model & Cost

Sources: OpenAI Blog, Business Insider, Bloomberg/CNBC, WIRED, TechCrunch, The Guardian