Will OpenAI or Anthropic IPO first?
Based on available reporting that OpenAI has confidentially filed and Anthropic has only recently listed paperwork, I assess OpenAI is more likely to IPO before Anthropic, but not a slam-dunk; I estimate a 65% probability that OpenAI will IPO first.
Analysis
**Stage 1 — Blind analysis (ignore market prices)**
Summary of facts I accept as given: - Reuters/related reporting states OpenAI "confidentially filed for a U.S. IPO" but gave no size/timing details. - Reporting also indicates Anthropic "listed IPO paperwork last week," but with less clarity around timing and progress. - Neither company has a public pricing date; both are large, well-funded AI companies with strong incentives to access public markets at some point.
How I reason from those facts: - A confidential S-1/IPO filing is a *material* signal. Historically, confidential filings typically precede an offering within a window that ranges from a few months to a year once market/board conditions align. That makes OpenAI *process-advanced* relative to peers who have not filed. Confidential filing reduces, but does not eliminate, the possibility of delay or withdrawal. - Anthropic’s listing of IPO paperwork indicates serious intent, but the available note lacks detail that would put it ahead of OpenAI. Two companies filing close together is common; the one that has already completed confidential submission to the SEC is usually, all else equal, slightly ahead operationally. - Nevertheless, filing is not the same as pricing. Timing uncertainties remain large: companies can pause, amend, withdraw; they may wait for favorable market windows; or they may prioritize strategic pre-IPO alliances (e.g., deeper Microsoft/OpenAI deals) that postpone an offering.
Balancing these points, my independent assessment is that OpenAI is more likely to be first, but the probability is far from certain because: - Anthropic may accelerate, or OpenAI may delay. Both companies have ample private capital and strategic options (secondary sales, direct listings, M&A, extended private funding) that could change the order. - Regulatory scrutiny of AI, governance and investor negotiations (dual-class shares, Microsoft economic terms, data/security disclosures) could cause variable delays.
I therefore assign a 65% probability that OpenAI will IPO before Anthropic (the prediction_percentage above). This reflects a clear tilt toward OpenAI because of the confidential filing, tempered by significant upside/downside uncertainty.
**Stage 2 — Market calibration (compare to current market prices)**
Current market prices show Yes = 0.78, No = 0.22. My independent probability (65%) is ~13 percentage points below the market-implied chance.
Why the market might be higher than my independent estimate: - Market participants may be overweighting the Reuters statement as tantamount to an imminent, unavoidable IPO. The phrase "confidentially filed" is often interpreted by traders as a near-certain, near-term listing, which is not always true. - The market may be driven by brand-name momentum and heuristics: OpenAI is the better-known household name, and traders may reflexively favor it as the likely first mover. - Some participants might be interpreting the question differently (see ambiguity note below). If a subset of traders thinks the question simply asks whether *either* company will IPO before 2040, price would rationally be near 1.0; mixing interpretations can push the Yes price upward. - Heavy volume (267k contracts) can reflect herding or a few large liquidity providers taking one side and moving price.
Why the market might be correctly higher than my estimate: - There may be additional non-public intelligence (banker schedules, quiet marketing, pre-IPO investor coordination) that traders with industry contacts are pricing in. If traders are seeing stronger signals than the public thread, the market price might be rational.
Net calibration judgment: - I view the market price as somewhat optimistic about the certainty and timing implied by OpenAI's confidential filing. The market likely overweights the filing signal and underweights the non-trivial probability of delay, withdrawal, or Anthropic leapfrogging. Therefore I see a modest mispricing versus my independent view, but not a massive one — 0.78 is plausible if many traders interpret the Reuters note as near-decisive or if non-public signals exist.
Ambiguity note (important): - The event title/question can be read in two ways: (A) "Will OpenAI IPO before Anthropic?" (a clear binary) or (B) "Will either OpenAI or Anthropic IPO first (i.e., will one of them IPO before the other)?" (tautologically true unless neither IPOs by 2040). I have treated the market context and the provided news as addressing interpretation (A), which is consistent with how the reporting is framed. If the market has a mix of interpretations, that could explain prices higher than my assessment.
Arguments
For
- OpenAI has *already* confidentially filed with the SEC — historically a strong indicator of being ahead in the IPO process.
- OpenAI faces strong incentives to monetize and provide liquidity (large investor base, public partnership with Microsoft) which can push toward a timely public offering.
- Confidential filing typically follows internal readiness (audited financials, legal reviews), suggesting fewer near-term procedural hurdles than for a company that has only 'listed paperwork.'
Against
- Confidential filing does not guarantee imminence — companies often file and then delay or revise; the filing did not include timing or size details.
- Anthropic also appears to be moving toward public markets and could accelerate its schedule, especially if it perceives a competitive advantage in being first to market.
- Strategic considerations (e.g., deeper Microsoft/OpenAI agreements, data/regulatory disclosures) could cause OpenAI to postpone pricing to negotiate better long-term terms.
Key drivers
- Concrete filing activity: OpenAI's confidential SEC filing versus Anthropic's recent paperwork listing
- Access to and terms of private funding (ability to remain private longer reduces need for immediate IPO)
- Strategic partners and large investors (Microsoft's role with OpenAI could accelerate or retard a public listing depending on negotiations)
- Regulatory and disclosure risks specific to AI (SEC + potential legislative scrutiny influencing timing)
- Market-window conditions for technology IPOs (volatility, interest-rate environment, investor appetite for high-growth AI stocks)
Risk factors
- Companies withdraw or delay filings despite prior confidential submissions
- Acquisition or alternative liquidity events (one company could be bought before going public)
- Ambiguity in question interpretation creating market pricing noise
- Opaque private negotiations (big customers or investors negotiating pre-IPO concessions) that change sequencing
- Macro shock or IPO-market closure that pushes both IPOs far into the future or leads to cancellations
Scenarios
Best case
OpenAI completes its confidential-filed IPO first within months to a year. The market window is favorable, negotiations with strategic partners (Microsoft) conclude quickly, and Anthropic prices a later offering. This is a clean-read win for OpenAI and is consistent with press signaling.
Most likely
OpenAI remains the process leader and ultimately prices before Anthropic, but the lead is modest: both companies file/prepare over a ~6–24 month window, and shifting market or regulatory conditions compress or expand timing. Delays or close sequencing are plausible, making the result non-decisive until official pricing dates appear.
Worst case
OpenAI's confidential filing is followed by internal delays or a decision to seek alternative liquidity (large private secondary, strategic financing, or acquisition). Anthropic accelerates and prices a U.S. IPO first, or both firms postpone indefinitely. In this scenario the 'No' outcome (OpenAI not first) occurs.
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