Will OpenAI or Anthropic IPO first?
Anthropic appears slightly more likely to IPO before OpenAI, mainly because the latest reporting points to a nearer-term listing window for Anthropic while OpenAI’s timetable has drifted later. My independent estimate gives Anthropic-first a meaningfully lower probability than the market implies.
Analysis
The core question is not whether either company will eventually go public, but which one gets there first. On the facts provided, Anthropic has the cleaner near-term path: recent reporting places it in investor meetings and points to a September or early October 2026 share sale, while OpenAI’s path has become more ambiguous despite its confidential S-1 filing. OpenAI’s filing is a meaningful step, but a filing without a fixed offering window does not beat a company that is actively being described as preparing a nearer debut. The added liquidity from OpenAI’s large secondary sale also reduces urgency and makes a delay more plausible.
Historical IPO behavior in large private tech companies also supports caution about treating a filing as a near-certain lead. When management wants flexibility, the first filing often becomes a bargaining chip rather than a commitment, especially in volatile markets and when valuation expectations are extremely high. The reporting here suggests exactly that dynamic: OpenAI may prefer to wait for a stronger valuation backdrop, while Anthropic seems to be closer to executing if market conditions hold. That makes Anthropic-first the more likely path, even though both plans could slip.
Compared with the current market price of 93% for Yes, the market seems somewhat too confident. A 93% price implies Anthropic-first is nearly locked in, but the available information still leaves meaningful execution risk on both sides: SEC review can slow, market conditions can worsen, and either company can decide to delay for valuation or strategic reasons. The market is probably correctly leaning toward Anthropic, but the spread between a very strong lean and near-certainty looks too wide. My estimate is lower than the market because the event is still a timing race between two private companies, not a completed corporate action.
Arguments
For
- Recent reporting is more specific and imminent for Anthropic than for OpenAI.
- OpenAI has liquidity from a large secondary sale, which reduces pressure to rush a public listing.
Against
- Both companies remain private, so either timetable can slip materially before launch.
- OpenAI’s formal filing means it still has a credible path to move faster if it chooses.
Key drivers
- Anthropic’s reported September or early October 2026 timeline gives it the clearer first-mover advantage.
- OpenAI’s timeline has shifted later and remains flexible despite the confidential filing.
Risk factors
- Either company could delay its IPO if market volatility or valuation demands worsen.
- A surprise acceleration by OpenAI would undermine the Anthropic-first thesis.
Scenarios
Best case
Anthropic proceeds on the reported September or October 2026 track while OpenAI delays into 2027, making Anthropic the clear first IPO.
Most likely
Anthropic reaches the public markets first by a modest margin, while OpenAI follows later after more time spent optimizing valuation and market conditions.
Worst case
OpenAI surprises with a faster listing and Anthropic delays, or both slip so substantially that the expected ordering becomes less reliable.
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