Will OpenAI or Anthropic IPO first?
Anthropic is the clear leader to IPO first, with a confidential S-1 filed June 1, 2026, and an explicit October 2026 target, while OpenAI has shifted its timeline to 2027 due to valuation disputes and legal risks.
Analysis
Anthropic has decisively positioned itself to go public before OpenAI. The company confidentially filed its S-1 with the SEC on June 1, 2026, and is actively targeting a Nasdaq debut in October 2026, backed by a $965 billion valuation from its May 2026 Series H round. In contrast, OpenAI filed its S-1 later on June 8, 2026, and has explicitly delayed its IPO timeline to 2027 because CEO Sam Altman refused to lower its target valuation from $1 trillion to match market realities.
Critical factors reinforce Anthropic's lead. OpenAI faces significant headwinds including a lawsuit from Apple alleging trade secret theft, declining consumer market share to Anthropic, and Wall Street banks predicting large model IPOs will be postponed to the first half of 2027 due to risk appetite concerns. OpenAI's market probability for an IPO by December 31, 2026, has dropped to 18.5%, while Anthropic's implied probability is significantly higher given its October target.
The current market price of 84% for 'Yes' appears mispriced and too conservative. While the market correctly identifies Anthropic as the likely winner, it fails to fully account for the structural certainty of OpenAI's delay. OpenAI's decision to wait for a higher valuation is a strategic choice, not a temporary setback, and the Apple lawsuit further reduces liquidity and IPO feasibility in late 2026. Unless OpenAI abruptly reverses its stance, the October 2026 vs. 2027 timeline gap makes Anthropic's victory nearly certain, warranting a probability closer to 90-95%.
Arguments
For
- Anthropic filed its S-1 earlier (June 1) and has a confirmed October 2026 target
- OpenAI has explicitly delayed its IPO to 2027 due to valuation disputes
- Anthropic's valuation ($965B) surpasses OpenAI's ($852B), strengthening IPO readiness
- OpenAI faces legal risks from Apple lawsuit and losing consumer market share to Anthropic
Against
- Anthropic's October 2026 date is a target, not a guaranteed confirmed transaction date
- OpenAI could unexpectedly reverse its delay decision and accelerate its IPO timeline
- Market volatility or regulatory issues could postpone both IPOs beyond the current timeline
Key drivers
- Anthropic's explicit October 2026 IPO target versus OpenAI's shift to 2027
- OpenAI's refusal to lower valuation target from $1 trillion to market realities
- Anthropic's higher valuation ($965B) and earlier S-1 filing (June 1 vs. June 8)
- OpenAI's legal risks from Apple lawsuit and declining consumer market share
Risk factors
- Anthropic could delay its October 2026 target due to SEC review or market volatility
- OpenAI could abruptly reverse its decision and accelerate its IPO timeline to late 2026
- Regulatory hurdles or investor sentiment shifts could postpone both IPOs beyond 2026
Scenarios
Best case
Anthropic successfully IPOs in October 2026 at a near-$1 trillion valuation, becoming the first pure-play AI company to debut above that threshold, while OpenAI remains private until 2027.
Most likely
Anthropic IPOs in October 2026 as targeted, while OpenAI waits until 2027 to resolve valuation disputes, making Anthropic the clear first IPO.
Worst case
Anthropic delays its October 2026 IPO due to SEC review or market conditions, and OpenAI unexpectedly accelerates its timeline to late 2026, going public first.
More from this day
- pop culturePolymarketEnded
How many World Cup matches will Trump attend?
AI97%MKT3%Edge+94Hidden GemTrump will attend 1 match (the 2026 World Cup Final), so the outcome '0 matches' is false. The market should resolve to No.
- PoliticsKalshi2y
Which agencies will Trump eliminate?
AI98%MKT35%Edge+63Hidden GemUSAID looks overwhelmingly likely to count as eliminated under this market’s framing, because it has already been dismantled and absorbed into the State Department. I assign only a small residual chance that the market’s exact wording requires a stricter legal definition than the current facts satisfy.
- CompaniesKalshi1y
Robinhood funded customers in 2026
AI18%MKT77%Edge-59HypedRobinhood is unlikely to reach above 30.2 million funded customers in 2026, as the company reported only 27.7 million in May 2026 and needs an improbable 2.5 million new customers in the remaining seven months without evidence of a growth surge.