Will OpenAI or Anthropic IPO first?
Anthropic now looks slightly more likely to IPO before OpenAI, despite OpenAI’s early formal filing. The market appears to be overweighting OpenAI’s head start and underweighting the stronger recent timing signals around Anthropic.
Analysis
The best current read is that Anthropic has a modest edge to be first to market. OpenAI has taken the more formal step by confidentially filing an S-1, but its timing has become less certain, with recent reporting pushing its debut into 2027 rather than late 2026. By contrast, Anthropic is increasingly being described as the faster mover, with multiple August 2026 reports pointing to a possible fall or October 2026 IPO window. That makes the race less about who is farther along administratively and more about who actually converts preparations into a public listing first.
The key reason this is not a slam dunk is that both companies remain in pre-listing territory and neither has a firm public timetable. A confidential filing is meaningful, but it is not the same as a locked launch sequence, and delays can still happen for both companies. OpenAI also has stronger scale and a clearer readiness story, with reported revenue strength supporting eventual IPOability, which means it cannot be dismissed just because recent timing chatter has softened. Still, the absence of a confirmed OpenAI date matters, because markets like this often resolve on execution speed, not prestige or filing order.
Against the current market price, the 92% Yes probability looks too high if Yes means OpenAI or Anthropic IPOs first. That price implies near certainty that the first listing will be one of them, when the real uncertainty is sequencing and timing, not whether either company can ever go public. A more balanced reading is that Anthropic has a slight lead today, but the event remains vulnerable to timeline slippage in either direction, so the market looks to be pricing in too much confidence on a still-fluid outcome.
Arguments
For
- Anthropic has the stronger near-term timing signal, with several reports pointing to a 2026 debut window before OpenAI’s.
- OpenAI’s filing shows the race is real, but the lack of a fixed date leaves room for Anthropic to move first.
Against
- OpenAI has already completed the formal SEC filing step, which often precedes the actual IPO process.
- The market could be right that one of these two will list well before 2040, making a Yes outcome likely even if the order remains uncertain.
Key drivers
- Recent reporting favors Anthropic as the faster potential debut, with fall or October 2026 timing repeatedly cited.
- OpenAI has filed confidentially but still lacks a firm IPO date, and some reports now push its listing into 2027.
Risk factors
- A confidential filing does not guarantee execution, and either company could delay or reverse course.
- If OpenAI accelerates its process or Anthropic slips, the first-to-IPO order could change quickly.
Scenarios
Best case
Anthropic stays on its reported fall 2026 schedule and lists before OpenAI, which drifts into 2027 or later.
Most likely
Anthropic edges out OpenAI on timing, but the gap remains narrow and heavily dependent on whether recent reported timelines hold.
Worst case
OpenAI accelerates and prices before Anthropic, or Anthropic’s timing slips materially while OpenAI moves ahead.
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