Will OpenAI or Anthropic IPO first?
I assess a 25% chance that OpenAI will IPO before Anthropic. Anthropic's earlier confidential filing and high probability of a late‑2026 announcement make it the clear favorite to go public first.
Analysis
**Stage 1 — Blind analysis (ignore current market prices):**
I interpret the market question as *"Will OpenAI IPO before Anthropic?"* and evaluate the probability that OpenAI is the first of the two to complete a public offering. Given the facts in the summary and historical patterns for large AI startups, Anthropic is materially more likely to be first. Key factual inputs: Anthropic confidentially filed in early June 2026 and Kalshi traders assign ~70% that Anthropic will announce by December 2026; OpenAI has signaled a preference for a 2027 IPO to hit a $1T valuation and has not undertaken pre‑IPO investor testing. Those two items (earlier Anthropic filing + OpenAI public delay) are the dominant signals. Market volatility and OpenAI’s valuation ambitions make OpenAI both less willing to take a discounted or smaller public window and more likely to postpone until conditions and pricing meet their target.
Quantitatively, I view Anthropic as having roughly a 65–75% chance of being first, OpenAI ~20–30%, and a small residual chance (~5–10%) of neither/other outcomes (acquisition, cancelled IPOs, or both delayed into very long horizons). Distilling my independent view: 25% for OpenAI to IPO before Anthropic.
Important drivers behind this number include the timing of confidential S‑1s (Anthropic earlier), stated managerial intent (OpenAI explicitly pushing to 2027), and market receptivity. Historically, startups that want a materially higher valuation will wait for better windows rather than accelerate to be first — that dynamic favors Anthropic when the implied race is speed vs. valuation. Regulatory and safety review risks cut both ways but do not erase the current momentum advantage for Anthropic.
**Stage 2 — Market calibration (considering the current market price Yes: 0.87 / No: 0.13):**
The current market price (Yes 87%) is strongly at odds with my independent assessment. There are two plausible causes for this divergence:
- *Ambiguity/mislabeling of the contract:* The literal event title "Will OpenAI or Anthropic IPO first?" can be interpreted as the near‑tautological "Will either OpenAI or Anthropic IPO first (vs. neither) before 2040?" If market traders believe "Yes" means "one of these companies will be first to IPO (i.e., at least one will IPO before 2040)," then a high Yes price (~87%) is sensible. If instead the binary means "Will OpenAI IPO before Anthropic?" then the market appears deeply mispriced relative to publicly available signals.
- *Skewed liquidity, stale information, or concentration of positions:* Large participants or early liquidity may have pushed the price toward Yes based on earlier expectations (OpenAI earlier), and that price has not corrected to reflect the most recent statements and Anthropic’s filing. Mispricing can persist in long‑dated event markets when traders hedge other exposures or when the contract is used synthetically in broader portfolios.
If the contract indeed asks "Will OpenAI IPO before Anthropic?" the market price ~87% is likely wrong. That mispricing could be exploitable by traders who short Yes / buy No, provided they (a) confirm the contract definition is *OpenAI before Anthropic* and (b) are comfortable with idiosyncratic tail risks (e.g., sudden Anthropic delay, OpenAI accelerating, or an acquisition altering the race). If instead the contract is ambiguous or intended as "will either of them IPO first (vs neither)", then the market price is more defensible and my independent probability estimate is not applicable.
Bottom line: under the standard interpretation that the Yes side represents "OpenAI IPOs before Anthropic," I place OpenAI first at 25% and view the market (Yes 87%) as substantially mispriced or mislabelled. If the contract is ambiguous, resolve the label before acting; the market may simply be expressing a different question than the one assumed in my independent estimate.
Arguments
For
- OpenAI already confidentially filed an S‑1 (May/June 2026), so operationally it can move to an announcement if it chooses — this reduces absolute lead time disadvantage.
- OpenAI has stronger brand recognition and deeper customer/partner relationships, which could allow a rapid roadshow/IPO execution if management decides to prioritize speed over valuation.
- Large incumbent backers and secondary market interest could press OpenAI toward an earlier public window if pre‑IPO liquidity or financing needs arise.
Against
- Anthropic filed for an IPO earlier in June 2026 and Kalshi traders give it ~70% odds of announcing by Dec 2026 — momentum and filing order favor Anthropic as first.
- OpenAI has publicly signalled a 2027 target and is explicitly prioritizing valuation ($1T), making it less likely to accelerate into a sub‑optimal market window.
- Market volatility and reduced retail enthusiasm for big tech IPOs raise the bar for OpenAI to risk an earlier than‑target debut.
Key drivers
- Relative confidential S‑1 timing (Anthropic filed earlier in June 2026)
- OpenAI management signal to delay to 2027 to chase a $1T valuation
- Market conditions / tech investor appetite (choppy markets reduce likelihood of earlier OpenAI IPO)
- Anthropic's ~70% market‑implied chance of announcing by Dec 2026 and its momentum
- Strategic choices (valuation target, direct listing vs traditional IPO, pre‑IPO financing) that alter timing incentives
Risk factors
- Anthropic unexpectedly delays — technical, regulatory or valuation reasons could push Anthropic past OpenAI
- OpenAI accelerates — investor pressure, a favorable window, or a strategic need for permanent capital could prompt an earlier listing
- M&A — either company could be acquired (or merge) before an IPO, changing who 'went public first' or rendering the question moot
- Regulatory or national security interventions delaying one or both issuers
- Contract ambiguity or market mislabelling that produces apparent price dislocations
Scenarios
Best case
For the 'OpenAI-first' outcome: Anthropic hits a late and unexpected delay (regulatory issues, technical gaps, or management reconsideration) while OpenAI turns cautious statements into a rapid late‑2026 or very early‑2027 announcement and execution. This could occur if a financing need or a narrow favorable market window emerges for OpenAI.
Most likely
Anthropic announces and executes a public offering before OpenAI. Anthropic’s earlier filing and stated intent to move sooner make it the frontrunner; OpenAI delays to 2027 to protect valuation targets and ends up second or chooses alternative financing paths that postpone its public debut beyond Anthropic’s timeline.
Worst case
Anthropic proceeds smoothly and announces a public debut in late 2026 (consistent with the 70% signal), while OpenAI holds out for a 2027 or later listing — OpenAI finishes second (No outcome), and the market consensus that OpenAI would be first proves wrong.
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