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Will Open AI or Anthropic IPO first?

KXOAIANTH-40-ANTH · Financials · 2026-05-13
67%
Agent
69%
Market Price
-2.0%
Edge
40%
Confidence
Volume: 66,923
Spread: 3.0c
Days to resolution: 4980
Markets in event: 2
Final Rationale
My independent estimate of 64.3% rested on Anthropic's concrete IPO preparation (Wilson Sonsini engagement, IPO-experienced CFO, Q4 2026 internal target, 'last private round' framing) combined with OpenAI's Musk litigation overhang creating execution drag. I PARTIALLY ACCEPT the critic's math/logic point (Challenge 2-3): properly decomposing as P(Anthropic IPOs by 2040) × P(beats OpenAI | IPOs) ≈ 0.88 × 0.75 ≈ 0.66, plus the asymmetric scenario where OpenAI never IPOs but Anthropic does also resolves YES, justifies a small upward adjustment to ~0.67. I REJECT heavy deference to the 69% market given its wide spread ($0.98) and 27-98% historical range indicating thin informed trading, but the directional agreement reinforces the upward correction. The remaining 2-point gap to market reflects residual uncertainty over a 13.6-year horizon where OpenAI could resolve the Musk suit and race ahead.
Price vs. prediction
How the market moved after the agent's call. Solid blue line is the actual market price; dashed line is the agent's static forecast at $t{=}0$.
$n = 58$ follow-ups
Re-scan Context
This market has been scanned before. Previous predictions:
DatePredictedMarket PriceConfidence
2026-05-06 64% 68% 35%
2026-04-29 66% 74% 35%
2026-04-03 59% 63% 50%
1. Planner Opus · Fermi decomposition + tool plan
Tools chosen: kalshi_data kalshi_orderbook article_search web_search earnings_data wikipedia_lookup
Sub-questions (Fermi decomposition)
  1. Will Anthropic confirm or announce an IPO before OpenAI does (i.e., Anthropic goes public first)? (w=0.40)
  2. Will Anthropic IPO before January 1, 2040 (regardless of ordering relative to OpenAI)? (w=0.35)
  3. Will OpenAI IPO before Anthropic, preventing Anthropic from resolving this market YES? (w=0.25)
Planner reasoning
This question resolves YES if Anthropic confirms an IPO *before* OpenAI does (and before Jan 1, 2040). The key analytical challenge is a race dynamic between two private AI giants. Key considerations: 1. **Structural readiness**: OpenAI has a complex capped-profit structure transitioning to a for-profit entity, which may accelerate or delay its IPO depending on how governance restructuring plays out. Anthropic is a public benefit corporation with heavy Amazon/Google backing (~$8B+ raised), which could delay IPO need. 2. **Incentive analysis**: Both companies are burning enormous capital on compute. IPO pressure may come from a need to access public markets, though both have massive private backers. OpenAI has been more public-facing about considering a transition; Anthropic has been quieter on IPO plans. 3. **Reference class**: Major AI/tech unicorns typically IPO 7-12 years after founding. OpenAI was founded 2015 (11 years by 2026), Anthropic 2021 (5 years by 2026). By base rates, OpenAI is closer to IPO maturity. 4. **Temporal dynamics**: With 4,980 days (~13.6 years) until resolution, the base probability both companies IPO is very high. The race question is which goes first. OpenAI is currently larger by revenue and more advanced in restructuring to for-profit, giving it a slight edge to IPO first — which would mean Anthropic does NOT go first, resolving NO. 5. **Market signal**: The Kalshi market price will be key data. If the market prices this at ~40-50%, it suggests roughly even odds on who goes first, adjusted for the 'Anthropic first' framing. The forecast should weight: P(both IPO before 2040) * P(Anthropic goes before OpenAI | both IPO). Given OpenAI's more advanced IPO readiness, Anthropic going first seems less likely than OpenAI going first, suggesting a base probability below 50% for YES.
2. Research Parallel tool calls · legacy v2
ToolStatusTimeItemsSummary
kalshi_data OK 3.9s -
kalshi_orderbook OK 0.2s -
article_search OK 2.7s -
web_search OK 53.4s -
earnings_data OK 1.4s -
wikipedia_lookup OK 1.2s -
3. Evidence Synthesis Sonnet · 19 items · legacy v2
#StrengthCredibilityDirectionSourceClaimPriced In
1 STRONG 72 ↑ UP kalshi_data The Kalshi market 'Will OpenAI or Anthropic IPO first? — Anthropic' is priced at 69%, suggesting the market believes Anthropic is more likely than OpenAI to IPO first. Yes
2 MODERATE 60 NEUTRAL kalshi_orderbook The orderbook shows HIGH liquidity with depth of 15,542 contracts, but the spread is extremely wide ($0.98), suggesting thin active quoting despite nominal depth; the 69% price should be treated with moderate caution. Yes
3 STRONG 75 ↑ UP web_search Anthropic has hired IPO counsel (Wilson Sonsini), a CFO with IPO experience, and internally discussed a Q4 2026 IPO timeline, indicating active near-term IPO preparation. Yes
4 STRONG 70 ↑ UP web_search Anthropic's current fundraising round (~$50B at ~$900B valuation) is described as likely its 'last private round before going public,' with early backers waiting to cash out at IPO. No
5 MODERATE 78 ↑ UP article_search OpenAI is currently embroiled in the Musk v. Altman lawsuit, which seeks to return OpenAI to nonprofit structure; an adverse ruling could significantly delay or complicate OpenAI's for-profit restructuring and IPO path. Yes
6 MODERATE 80 ↓ DOWN article_search OpenAI completed a $122B funding round at an $852B valuation in late March 2026, suggesting it still has ample private capital and may not urgently need an IPO. Yes
7 MODERATE 82 ↓ DOWN web_search An Anthropic spokesperson told Reuters the company has not decided when or if it will go public, maintaining ambiguity despite IPO preparations. Yes
8 MODERATE 65 ↓ DOWN article_search Anthropic was founded in 2021 (only ~5 years old as of 2026), while OpenAI was founded in 2015 (~11 years); by reference class, younger companies take longer to reach IPO maturity, potentially delaying Anthropic relative to OpenAI. Yes
9 STRONG 78 ↑ UP web_search Anthropic's revenue grew from $14B run-rate in February 2026 to over $30B in April 2026, showing rapid revenue scaling that strengthens IPO viability by 2040. No
10 MODERATE 70 ↓ DOWN web_search Anthropic is not expected to be cash flow positive until 2028, reflecting sustained operating losses that could delay IPO readiness for public markets. Yes
11 STRONG 75 ↑ UP web_search Anthropic has hired Wilson Sonsini as IPO counsel and a CFO with IPO experience, with internal discussions targeting Q4 2026, indicating a high probability of IPO well before 2040. Yes
12 STRONG 75 ↑ UP article_search Anthropic is raising what may be its last private round before going public, with massive institutional investor participation (BlackRock, Fidelity, Sequoia, Goldman, JPMorgan), pointing to a near-term IPO path. Yes
13 MODERATE 85 ↑ UP article_search Anthropic won a preliminary injunction against the Pentagon's national security ban, reducing the risk of catastrophic government-driven revenue loss that could threaten the company's viability. Yes
14 MODERATE 80 ↑ UP wikipedia_lookup Anthropic is a privately held public benefit corporation backed by Amazon and Google, with a $380B valuation as of February 2026; its corporate structure and major backers are conducive to an eventual IPO. Yes
15 STRONG 80 ↓ DOWN article_search OpenAI is currently undergoing the Musk v. Altman lawsuit, which seeks to reverse its for-profit conversion; a ruling against OpenAI could block or delay its IPO by years. Yes
16 MODERATE 75 ↓ DOWN article_search OpenAI closed a $122B funding round at $852B valuation in March 2026, and Anthropic is now raising at $900B+, suggesting Anthropic's valuation may now exceed OpenAI's — a reversal that may shift IPO sequencing expectations. No
17 WEAK 55 ↑ UP article_search OpenAI announced a Pentagon deal immediately after Anthropic was banned, suggesting OpenAI has stronger government ties and political alignment, which may facilitate its regulatory path to IPO. Yes
18 MODERATE 75 ↑ UP wikipedia_lookup OpenAI has restructured into a for-profit PBC (public benefit corporation), removing a key structural barrier to IPO, giving it a more direct path to going public than Anthropic's current structure. Yes
19 MODERATE 65 ↓ DOWN kalshi_data The Kalshi market prices Anthropic as the more likely first IPO at 69%, implying only ~31% probability that OpenAI IPOs first — a market consensus that OpenAI going first is the less likely scenario. Yes
Information Gaps
  • No direct Kalshi or prediction market data specifically on 'Will OpenAI IPO before Anthropic?' as a separate market; the inverse side of the race must be inferred.
  • No confirmed S-1 filing or SEC registration statement from Anthropic — all IPO prep signals are secondary (law firm hire, CFO hire, internal discussions).
  • No public data on OpenAI's specific IPO timeline or whether the Musk lawsuit outcome could legally block a for-profit IPO.
  • No information on whether Amazon or Google's strategic investments include rights that could complicate Anthropic's IPO (e.g., lockup periods, board control provisions).
  • No evidence on how the Q4 2026 IPO timeline discussion at Anthropic has progressed since December 2025 — whether it has been accelerated, delayed, or abandoned.
  • No data on OpenAI's current revenue, profitability trajectory, or IPO readiness indicators comparable to Anthropic's recent disclosures.
  • No evidence regarding whether either company has filed confidential S-1 or draft registration statements with the SEC.
  • Unclear whether Anthropic's PBC structure requires specific governance changes prior to IPO that could affect timing.
Key Uncertainties
  • Outcome of the Musk v. Altman lawsuit: an adverse ruling forcing OpenAI back to nonprofit status would likely delay OpenAI's IPO significantly, increasing the probability Anthropic goes first.
  • Whether Anthropic's Q4 2026 IPO target materializes: if it does, it would almost certainly beat OpenAI to market given OpenAI's legal uncertainty.
  • Macroeconomic and IPO market conditions in 2026-2027: a risk-off environment or tech valuation compression could delay both companies' IPOs.
  • Anthropic's path to profitability: markets typically demand a clearer profitability path from IPO candidates; the 2028 cash-flow-positive timeline could defer public market appetite.
  • Whether Amazon or Google's strategic stakes create complications or incentives affecting Anthropic's IPO decision.
  • Whether the Trump administration's conflict with Anthropic creates lasting regulatory headwinds affecting investor sentiment for an Anthropic IPO.
  • Whether either company is acquired before IPO (low probability but non-trivial given scale of big tech interest).
  • The wide bid-ask spread on the Kalshi market ($0.98) raises questions about true price discovery quality despite the headline 69% price.
Market Context
Price: 0.69 · 7d: -0.06 · 30d: -0.02
Volume: MODERATE — 393 avg daily contracts is reasonable for a long-duration market · Depth: HIGH nominal depth (15,542) but spread of $0.98 suggests very little genuine two-sided quoting; effective liquidity may be LOW
Reliability: LOW-MEDIUM — the 69% price has directional signal value but the extreme spread undermines confidence in precise probability inference; market has existed for ~169 days with a wide historical range (27%-98%), suggesting high uncertainty and potentially low informed trading
4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price
Independent estimate: 64% (40% confidence)
base rate
65%
40% conf
evidence driven
66%
40% conf
contrarian
62%
40% conf
Spread
4pp
Low disagreement
sq1: Will Anthropic confirm or announce an IPO before OpenAI does?
62%
Base rate for a binary race between two roughly comparable competitors is ~50%. Strong evidence pushes UP: Anthropic has concrete IPO prep (Wilson Sonsini, IPO-experienced CFO, Q4 2026 internal target, last private round framing) — pushes up ~15%. OpenAI is mired in Musk v. Altman litigation that directly threatens for-profit conversion — pushes up ~8%. Down: OpenAI's $122B raise shows ample capital and OpenAI is 6 years older with more mature revenue — pushes down ~8%. Anthropic spokesperson denials and PBC structure complications — pushes down ~3%. Net: ~62%.
sq2: Will Anthropic IPO before January 1, 2040?
88%
Base rate: large unicorns at $380B+ valuation with rapid revenue growth and major institutional backers nearly always either IPO or get acquired within ~15 years. Over 13.6 year window, very high probability. Strong IPO prep signals, $30B revenue run-rate, last-private-round framing push toward IPO. Risks: acquisition (low given antitrust at this scale), company failure/AI winter (~5-8% over 14 years), or perpetual private status (low). Estimate 88%.
sq3: Will OpenAI IPO before Anthropic?
32%
This is essentially the complement of sq1 conditional on both IPOing. Musk lawsuit is a major drag on OpenAI's IPO timeline. OpenAI does have more revenue maturity and completed PBC conversion, but legal uncertainty and lack of concrete IPO banker engagement (unlike Anthropic) tilts against OpenAI going first. ~32%.
Show full reasoning trace
base rate: In a two-horse race with 13.6 years runway, base rate is ~50% adjusted for which company appears closer to IPO. Both companies are near-certain (~85-90%) to IPO before 2040 given scale and backing.
evidence updates: Strongest update: Anthropic's concrete IPO prep (Wilson Sonsini, CFO, Q4 2026 target, 'last private round' framing) combined with OpenAI's Musk lawsuit overhang shifts the race ~12-15% toward Anthropic first. Counter-evidence (OpenAI's larger revenue maturity, completed PBC conversion, $122B capital cushion) partially offsets.
combination method: Treated as P(Anthropic IPOs first AND before 2040). Dominated by sq1, scaled slightly by sq2. sq3 is largely redundant with sq1. Final ~65%.
final: Anthropic has a modest but real edge in the near-term IPO race given concrete preparations and OpenAI's legal entanglements, but uncertainty is high given 13.6-year horizon and possibility OpenAI resolves Musk suit and IPOs first. Estimate 65%.
ensemble: {'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.65, 'confidence': 0.4}, 'evidence_driven': {'p_yes': 0.66, 'confidence': 0.4}, 'contrarian': {'p_yes': 0.62, 'confidence': 0.4}}, 'spread': 0.04, 'individual_p_yes': {'base_rate': 0.65, 'evidence_driven': 0.66, 'contrarian': 0.62}}
5. Devil's Advocate Sonnet · legacy v2 Market price revealed
Reasoning Flaw Asymmetric Evidence Math Error
Challenges
  1. Resolution criterion ambiguity: The question 'Will OpenAI or Anthropic IPO first?' resolves YES for Anthropic in this market framing, but the forecaster should verify whether the question resolves NO if neither IPOs by 2040, or if one is acquired/dissolved before IPOing. The 88% probability that Anthropic IPOs by 2040 assumes binary IPO-or-not, but acquisition, merger, or staying private indefinitely could resolve NO even if Anthropic 'beats' OpenAI to some milestone.
  2. Combination method is mathematically loose: The forecaster says the answer is 'P(Anthropic IPOs first AND before 2040)' which should be roughly sq1 × sq2 conditional structure. If sq1 = 0.62 is P(Anthropic announces first | both relevant) and sq2 = 0.88 is P(Anthropic IPOs by 2040), the product structure isn't clean. A cleaner decomposition: P(Anthropic IPOs by 2040) × P(Anthropic IPOs before OpenAI | Anthropic IPOs) ≈ 0.88 × 0.70 ≈ 0.62, OR account for scenarios where OpenAI never IPOs (which would still resolve YES for Anthropic). The 0.643 figure isn't well-derived from the sub-questions.
  3. Underweighting the scenario where OpenAI never IPOs: Over 14 years, there's meaningful probability OpenAI stays private (Altman has expressed reluctance), gets restructured, or fails — all of which favor Anthropic winning the race conditional on Anthropic IPOing. This asymmetry isn't fully captured.
  4. The forecaster cites the Kalshi market at 69% as STRONG evidence UP in their evidence list, but then arrives at 64.3% — slightly below market. If the market is treated as strong evidence, the forecast should be closer to 69%, not below it. This is an internal inconsistency.
  5. Anthropic spokesperson denial weighted at only -3% may be too low — public denials of IPO timing are standard but the 'no decision' framing genuinely indicates more uncertainty than concrete IPO prep signals suggest.
Suggested adjustment: +3pp
Small upward adjustment warranted because (1) the forecaster's own decomposition supports a higher number when properly combined — if Anthropic has ~88% chance of IPOing by 2040 and conditional on that has ~70-75% chance of beating OpenAI (given OpenAI's lawsuit and Anthropic's prep), the answer is closer to 65-68%, and (2) the scenario where OpenAI never IPOs but Anthropic does still resolves YES, which slightly boosts the probability. This is not a market-conformity adjustment but a math/logic correction.
Market comparison: Forecaster: 64.3%, Market: 69%. The 4.7% divergence is modest and within reasonable disagreement range. The market price has LOW-MEDIUM reliability due to wide spread, so heavy market-anchoring isn't warranted. However, the forecaster's own sub-question math arguably supports a number closer to the market than to 64%.
6. Aggregator Opus · final calibrated forecast
67% (40% confidence)
My independent estimate of 64.3% rested on Anthropic's concrete IPO preparation (Wilson Sonsini engagement, IPO-experienced CFO, Q4 2026 internal target, 'last private round' framing) combined with OpenAI's Musk litigation overhang creating execution drag. I PARTIALLY ACCEPT the critic's math/logic point (Challenge 2-3): properly decomposing as P(Anthropic IPOs by 2040) × P(beats OpenAI | IPOs) ≈ 0.88 × 0.75 ≈ 0.66, plus the asymmetric scenario where OpenAI never IPOs but Anthropic does also resolves YES, justifies a small upward adjustment to ~0.67. I REJECT heavy deference to the 69% market given its wide spread ($0.98) and 27-98% historical range indicating thin informed trading, but the directional agreement reinforces the upward correction. The remaining 2-point gap to market reflects residual uncertainty over a 13.6-year horizon where OpenAI could resolve the Musk suit and race ahead.