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Will Open AI or Anthropic IPO first?

KXOAIANTH-40-ANTH · Financials · 2026-04-29
66%
Agent
74%
Market Price
-8.0%
Edge
35%
Confidence
Volume: 62,680
Spread: 6.0c
Days to resolution: 4994
Markets in event: 2
Final Rationale
My independent estimate of 57% suffered from a methodologically weak combination across sub-questions; I accept Challenges 2-4 from the critique—sq1 directly answers the question and the Musk trial asymmetry plus Anthropic's concrete Oct 2026 banker engagement justify a larger tilt than +2% above 50/50. I reject Challenge 1 (the market context and my decomposition both clearly track the 'Anthropic first' interpretation) and partially accept Challenge 5 (over 14 years, structural blockers dominate timing, but the Musk trial IS a structural blocker for OpenAI specifically, not just a timing issue). Moving sq1 directly to ~62-65% is more coherent. The medium-liquidity market at 74% likely overweights recent OpenAI headlines and the Anthropic October 2026 target hype; settling at 66% splits the difference, deferring partially to the market while preserving skepticism that 14 years is long enough for OpenAI to recover from current setbacks.
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
2026-04-03 59% 63% 50%
1. Planner Opus · Fermi decomposition + tool plan
Tools chosen: kalshi_data article_search web_search earnings_data wikipedia_lookup
Sub-questions (Fermi decomposition)
  1. Will Anthropic IPO before OpenAI does (both before Jan 1, 2040)? (w=0.35)
  2. Will Anthropic IPO before Jan 1, 2040? (w=0.35)
  3. Will OpenAI IPO before Anthropic does? (w=0.30)
Planner reasoning
This question resolves YES if Anthropic confirms an IPO before OpenAI does (and before Jan 1, 2040). The key drivers are: (1) Current IPO readiness of each company — OpenAI has been more actively discussed as a near-term IPO candidate, especially following its corporate restructuring toward a for-profit model in 2024-2025. Anthropic remains more tightly held, backed primarily by Google and Amazon. (2) Corporate structure constraints — OpenAI's capped-profit structure was an obstacle to IPO, but the conversion to a public benefit corporation removes that. Anthropic has a long-term benefit trust structure that may slow or complicate IPO. (3) Temporal dynamics — with 4,994 days (~13.7 years) until resolution, both companies are likely to IPO eventually. The question is purely about sequencing. OpenAI has higher revenue, more public name recognition, and has further advanced its for-profit transition, making it a stronger near-term IPO candidate. Anthropic raised at ~$61B valuation in early 2025, but still trails OpenAI in scale. The reference class of AI companies' IPO timelines (e.g., Palantir, UiPath) suggests that once a company reaches $50B+ valuation, an IPO often follows within 3-5 years absent structural barriers. OpenAI appears closer to crossing that threshold first. The base rate question is: in competitive pairs of companies in the same sector, does the larger/more-valued company IPO first? Generally yes (~60-70% of the time). Key uncertainty: Anthropic could accelerate if Google/Amazon reduce stake, or if regulatory pressure forces public disclosure. OpenAI could delay if founder control/governance issues persist.
2. Research Parallel tool calls · legacy v2
ToolStatusTimeItemsSummary
kalshi_data OK 1.9s -
article_search OK 0.7s -
web_search OK 56.0s -
earnings_data OK 1.2s -
wikipedia_lookup OK 1.0s -
3. Evidence Synthesis Sonnet · 21 items · legacy v2
#StrengthCredibilityDirectionSourceClaimPriced In
1 STRONG 75 ↑ UP web_search According to Axios (April 3, 2026), both Anthropic and OpenAI want to go public later in 2026, with each hoping to beat the other to market; several investors are pushing Anthropic to file ahead of OpenAI to capture being the first pure-play AI stock. Yes
2 MODERATE 45 ↑ UP web_search FutureSearch forecasts Anthropic will IPO around March 2027 at a $560 billion median valuation, with OpenAI following in May 2027 — implying Anthropic IPOs first by roughly 2 months. No
3 STRONG 72 ↑ UP kalshi_data The Kalshi market 'Will Anthropic IPO first (before OpenAI, before 2040)?' is priced at 74%, up 4% in 7 days and 8% in 30 days, with moderate volume (~388 contracts/day). Yes
4 STRONG 82 ↓ DOWN article_search OpenAI issued a document resembling an IPO prospectus in March 2026, sharing it with prospective investors tied to its $110 billion financing round, signaling active IPO preparation. Yes
5 STRONG 88 ↑ UP article_search The Elon Musk lawsuit against OpenAI (currently in trial as of April 28, 2026) seeks to reverse OpenAI's for-profit conversion and remove Altman, creating significant legal uncertainty that could delay an OpenAI IPO. Yes
6 MODERATE 68 ↑ UP article_search Reports from April 28, 2026 indicate OpenAI may be missing user and revenue targets, with executives concerned about funding for future compute contracts — a potential headwind to near-term IPO readiness. No
7 STRONG 72 ↑ UP kalshi_data The Kalshi market for 'OpenAI IPO before Jan 1, 2027' is priced at 41%, down sharply (-10% in 7 days, -14% in 30 days), suggesting declining near-term market confidence in OpenAI's IPO timing. Yes
8 MODERATE 65 NEUTRAL kalshi_data The Kalshi market for 'Anthropic IPO before Nov 1, 2026' is priced at 46%, down 6% in 7 days but relatively stable over 30 days, suggesting moderate near-term probability for Anthropic's IPO. Yes
9 STRONG 75 ↑ UP web_search Anthropic has hired Wilson Sonsini law firm to prepare for IPO and is in active discussions with Goldman Sachs and JPMorgan Chase about an IPO potentially targeting October 2026 at a $400-500 billion valuation. Yes
10 STRONG 70 ↑ UP web_search Anthropic's annualized revenue reached $19 billion by March 2026 (up from $9B at year-end 2025), with $30B annualized run rate cited in some sources, and over 300,000 business customers including 8 of the Fortune 10. Yes
11 MODERATE 78 ↓ DOWN web_search Anthropic spokesperson told Reuters the company 'has not decided when or even if it will go public,' indicating no firm IPO commitment as of late 2025. Yes
12 STRONG 72 ↑ UP kalshi_data The primary Kalshi market for Anthropic IPO before 2040 is priced at 74%, trending upward (+8% in 30 days), with 161 data points and average daily volume of 388 contracts. Yes
13 MODERATE 82 ↑ UP article_search Anthropic won a key legal battle in March 2026 when a federal judge blocked the Pentagon's supply chain risk designation, reducing a major potential revenue disruption and stabilizing the company's path to IPO. Yes
14 MODERATE 75 ↓ DOWN article_search Anthropic's conflict with the Trump administration over Pentagon AI usage restrictions represents an ongoing political and regulatory risk that could complicate or delay IPO plans. Yes
15 WEAK 55 NEUTRAL wikipedia_lookup Anthropic is structured as a Public Benefit Corporation (PBC), which is compatible with public market listing but its long-term benefit trust structure may add governance complexity for IPO. Yes
16 STRONG 82 ↑ UP article_search OpenAI released an investor document resembling an IPO prospectus in March 2026, with risk disclosures about Microsoft reliance, signaling active IPO preparation ahead of a potential public offering. Yes
17 STRONG 88 ↓ DOWN article_search The ongoing Musk v. OpenAI trial (opening statements April 28, 2026) seeks $130 billion in damages and wants to reverse OpenAI's for-profit conversion; an adverse ruling could structurally block or significantly delay IPO. Yes
18 MODERATE 65 ↓ DOWN article_search Reports on April 28, 2026 say OpenAI missed recent user and revenue targets, with top executives concerned about funding for future compute; OpenAI called the WSJ report 'ridiculous' but the news is market-moving. No
19 STRONG 72 ↓ DOWN kalshi_data The Kalshi market for 'OpenAI IPO before Jan 1, 2027' is at 41% and falling sharply (-14% over 30 days), suggesting market participants are pushing back OpenAI's expected IPO timeline. Yes
20 STRONG 80 ↑ UP wikipedia_lookup OpenAI has completed its conversion to a for-profit public benefit corporation (PBC), removing the capped-profit structure that was a major structural obstacle to IPO. Yes
21 MODERATE 78 ↑ UP article_search OpenAI secured a Pentagon deal on the same day Anthropic was banned (Feb 27, 2026), showing stronger government alignment and potentially smoother regulatory path for OpenAI. Yes
Information Gaps
  • No confirmed S-1 filing or official IPO announcement from either Anthropic or OpenAI — all evidence is preparatory/speculative
  • Outcome of the Musk v. OpenAI trial is unknown and could fundamentally alter OpenAI's corporate structure and IPO eligibility
  • Anthropic's exact governance/ownership terms with Google and Amazon are not fully public — these could include IPO lockup provisions or consent rights that delay listing
  • No data on Anthropic's current profitability or burn rate, which is critical for IPO readiness assessment
  • No direct evidence of OpenAI's actual IPO timeline post-litigation — the March 2026 prospectus-like document is not a confirmed S-1
  • The valuation range for Anthropic cited in web search varies enormously ($183B to $500B), indicating high uncertainty in private market pricing
  • No data on whether either company has filed confidentially with the SEC (a common precursor to public S-1 filing)
  • Unclear how the Anthropic-Pentagon legal dispute will ultimately resolve and whether it will affect IPO investor appetite
Key Uncertainties
  • Outcome of Musk v. OpenAI trial — an adverse ruling could block OpenAI's for-profit conversion and indefinitely delay its IPO, strongly favoring Anthropic going first
  • Whether Anthropic's ongoing conflict with the Trump administration escalates or resolves — resolution could accelerate IPO; escalation could damage investor sentiment
  • Whether OpenAI's reported revenue/growth slowdown is real or temporary — if real, it could delay IPO readiness and boost Anthropic's relative positioning
  • Timing and sequencing of S-1 filings — both companies appear to be competing to file first, making this a near-term race with a winner potentially determined in 2026-2027
  • Google's and Amazon's strategic interests in keeping Anthropic private — as major investors and cloud partners, they may prefer Anthropic remains private longer
  • IPO market conditions in 2026-2027 — broader market volatility could delay both companies simultaneously
  • Whether either company gets acquired rather than IPOs, which would resolve neither as having IPO'd
Market Context
Price: 0.74 · 7d: +0.04 · 30d: +0.08
Volume: MODERATE · Depth: MEDIUM
Reliability: MEDIUM — 388 avg daily contracts, 161 data points over ~5 months, reasonable depth but not a highly liquid market. The 74% price for 'Anthropic IPOs first before 2040' reflects a meaningful shift from the full price range of 27%-98%, and the upward trend is notable. The related OpenAI market's sharp decline (-14% in 30 days) is directionally consistent with the Anthropic market's rise, suggesting correlated repricing driven by recent OpenAI headwinds (litigation, growth concerns).
4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price
Independent estimate: 57% (42% confidence)
base rate
56%
40% conf
evidence driven
60%
40% conf
contrarian
55%
45% conf
Spread
5pp
Low disagreement
sq1: Will Anthropic IPO before OpenAI does (both before Jan 1, 2040)?
52%
Base rate for which of two competing companies IPOs first is ~50%. Evidence shifts: Axios reporting both want to IPO in 2026 with investors pushing Anthropic to file first (+5%). FutureSearch forecast of Anthropic ~2 months ahead (+2%). Musk lawsuit creating significant structural uncertainty for OpenAI's for-profit conversion is a major potential delayer (+5-8%). OpenAI revenue/user target misses (+2%). Counter: OpenAI's March 2026 prospectus-like document signals active preparation (-3%). OpenAI's stronger government alignment (-2%). Net: ~52%.
sq2: Will Anthropic IPO before Jan 1, 2040?
88%
Base rate: companies with $20B+ revenue, top-tier banking relationships, and ~14 year window almost always IPO unless acquired. Hiring Wilson Sonsini and engaging Goldman/JPM with concrete Oct 2026 target (+15%). $19B annualized revenue with rapid growth (+5%). PBC structure compatible with public listing. Risks: acquisition by Google/Amazon (~5-8% probability), market disruption, governance complexity from long-term benefit trust, regulatory disputes. Over 14 years the IPO-or-acquired rate for such companies is ~95%; acquisition risk pulls down to ~88%.
sq3: Will OpenAI IPO before Anthropic does?
43%
Complement-ish to sq1 but allows for neither IPOing or OpenAI being acquired/blocked. Base rate ~50% for sequencing race. OpenAI's prospectus-like document and completed PBC conversion (+5%). Stronger revenue scale and government alignment (+3%). Counter: Musk trial poses substantial structural risk to for-profit conversion (-7%). Revenue target misses (-3%). Possibility OpenAI never IPOs due to legal/governance issues (~5%). Net ~43%.
Show full reasoning trace
base rate: In competitive IPO races between two well-funded private companies in the same sector, sequencing is roughly 50/50 absent strong differentiating factors. Over a 14-year horizon, both companies are very likely to IPO (~85-90% each) unless acquired or structurally blocked.
evidence updates: Key shifts toward Anthropic first: (1) Musk v. OpenAI trial creates real structural risk that could delay/block OpenAI's for-profit conversion, (2) Anthropic has concrete Oct 2026 target with engaged bankers/lawyers, (3) OpenAI reportedly missing growth targets, (4) investors actively pushing Anthropic to file first. Shifts toward OpenAI first: (1) March 2026 prospectus-like document, (2) completed PBC conversion, (3) larger scale and revenue, (4) better government alignment.
combination method: Weighted average across sub-questions, recognizing sq1 is the most direct measure and sq2/sq3 add information about absolute IPO probability and OpenAI's separate path.
final: Anthropic has a modest edge driven primarily by OpenAI's legal uncertainty (Musk trial) and Anthropic's apparent IPO infrastructure readiness. Settling at 56% reflects this slight tilt while acknowledging high uncertainty in the race outcome.
ensemble: {'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.56, 'confidence': 0.4}, 'evidence_driven': {'p_yes': 0.6, 'confidence': 0.4}, 'contrarian': {'p_yes': 0.55, 'confidence': 0.45}}, 'spread': 0.05, 'individual_p_yes': {'base_rate': 0.56, 'evidence_driven': 0.6, 'contrarian': 0.55}}
5. Devil's Advocate Sonnet · legacy v2 Market price revealed
Reasoning Flaw Math Error Missing Info
Challenges
  1. The question asks 'Will OpenAI or Anthropic IPO first?' — this resolution criterion is ambiguous in your decomposition. You appear to interpret it as 'Anthropic first', but it could mean 'will either of them IPO (i.e., be the first one to go public among the two)' which is essentially asking whether AT LEAST ONE IPOs before 2040. Re-read the question carefully — if it resolves YES when either IPOs first (which is automatic if either IPOs at all), the probability should be ~95%+, not 57%. The market at 74% suggests interpretation may be 'Anthropic first', but you should verify this rather than assume.
  2. Even under the 'Anthropic first' interpretation, your sq1 logic appears internally inconsistent with sq2 and sq3. If P(Anthropic IPOs by 2040) = 0.88 and P(OpenAI IPOs first) = 0.43, then P(Anthropic first) ≈ P(Anthropic IPOs) - P(OpenAI first AND Anthropic also IPOs later) ≈ should be around 0.88 - ~0.40 = ~0.48, but you should also account for cases where only Anthropic IPOs. The numbers don't cleanly combine and your final 57% via 'weighted average' is not a valid probabilistic combination.
  3. Your combination method ('weighted average across sub-questions') is methodologically suspect. sq1 directly answers the question; sq2 and sq3 are auxiliary. Averaging them dilutes the signal. The correct answer should derive from sq1 alone (or be derived structurally from sq2 and sq3 jointly), not averaged.
  4. You're underweighting the Musk trial asymmetry. A $130B damages claim plus structural challenge to OpenAI's for-profit conversion is a tail risk that primarily hurts OpenAI's IPO timing, not Anthropic's. Combined with Anthropic's concrete banker engagement and Oct 2026 target, the directional tilt should likely be larger than +2% over 50/50.
  5. The 14-year horizon means even a delayed OpenAI almost certainly catches up — you may be over-indexing on near-term 2026-2027 sequencing signals. Over 14 years, 'who IPOs first' is dominated by which company faces structural blockers, not timing of bankers. This argues for moving CLOSER to 50/50 on sq1, not further.
  6. Tension: you cite the Kalshi market at 74% as STRONG evidence UP in your evidence list but then your final forecast diverges 17% below it. Either the market is informative evidence (in which case you should weight it more) or it isn't — explain the asymmetry.
Suggested adjustment: +8pp
Two reasoning issues argue for a modest upward adjustment: (1) the sub-question combination method is not mathematically coherent and likely dilutes a stronger signal from sq1, (2) the Musk trial asymmetry and Anthropic's concrete IPO infrastructure readiness justify a larger tilt than +2% above 50/50 on sq1. Adjusting sq1 to ~58-62% and using it more directly yields ~63-65%. Note: this is independent of the market price; the adjustment is for reasoning flaws.
Market comparison: Forecaster: 57%, Market: 74%. The 17% divergence is partly justified (market may be overreacting to recent OpenAI headwinds; 14-year horizon favors mean reversion) but partly reflects genuine reasoning issues in the forecast (incoherent sub-question combination, possible under-weighting of Musk trial asymmetry). A forecast in the 62-68% range would better reflect the evidence while maintaining appropriate skepticism about market overreaction.
6. Aggregator Opus · final calibrated forecast
66% (35% confidence)
My independent estimate of 57% suffered from a methodologically weak combination across sub-questions; I accept Challenges 2-4 from the critique—sq1 directly answers the question and the Musk trial asymmetry plus Anthropic's concrete Oct 2026 banker engagement justify a larger tilt than +2% above 50/50. I reject Challenge 1 (the market context and my decomposition both clearly track the 'Anthropic first' interpretation) and partially accept Challenge 5 (over 14 years, structural blockers dominate timing, but the Musk trial IS a structural blocker for OpenAI specifically, not just a timing issue). Moving sq1 directly to ~62-65% is more coherent. The medium-liquidity market at 74% likely overweights recent OpenAI headlines and the Anthropic October 2026 target hype; settling at 66% splits the difference, deferring partially to the market while preserving skepticism that 14 years is long enough for OpenAI to recover from current setbacks.