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Will Open AI or Anthropic IPO first?

KXOAIANTH-40-ANTH · Financials · 2026-05-06
64%
Agent
68%
Market Price
-4.0%
Edge
35%
Confidence
Volume: 63,280
Spread: 2.0c
Days to resolution: 4987
Markets in event: 2
Final Rationale
Anthropic has concrete near-term IPO catalysts (Oct 2026 target, Wilson Sonsini engagement, $1.5B Wall Street JV formed days before forecast) while OpenAI is bogged down in the Musk litigation and incomplete for-profit restructuring — and because this is a 'first to IPO' question, the next 12 months dominate the 14-year horizon. I partially accept the critic's argument that I under-weighted these front-loaded catalysts (adjusting up from 0.59 to 0.64) but reject going to 0.68+ because OpenAI's prospectus-like circulation indicates parallel preparation and the older/more-mature firm base rate still pulls modestly against Anthropic. The market at 0.68 is close to my adjusted estimate; the small remaining gap reflects skepticism about the anomalous orderbook (penny bids both sides) and the possibility that the 30-day drift from 78% reflects real OpenAI progress I'm appropriately discounting given microstructure concerns.
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
2026-04-29 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 code_execution
Sub-questions (Fermi decomposition)
  1. Will Anthropic IPO before OpenAI does (i.e., Anthropic goes public first among the two)? (w=0.35)
  2. Will Anthropic IPO at all before January 1, 2040? (w=0.40)
  3. Will OpenAI IPO before Anthropic does (making the question resolve NO)? (w=0.25)
Planner reasoning
This question asks whether Anthropic will confirm an IPO before OpenAI does, with a very long horizon (until Jan 2040 — ~14 years from now). The key factors are: (1) Corporate structure differences: OpenAI is restructuring from a capped-profit LLC to a fully for-profit PBC, which could facilitate an IPO; Anthropic is a more traditional VC-backed PBC (public benefit corporation). (2) Funding stage: Both companies have raised massive rounds at high valuations ($40B+ for OpenAI, $18B+ for Anthropic as of 2025); typical VC-backed companies IPO 8-12 years after founding. (3) Timing asymmetry: OpenAI was founded in 2015 (older), Anthropic in 2021 (younger). OpenAI might logically IPO first given maturity, but its governance complexity (board drama, capped-profit restructuring) creates uncertainty. (4) Strategic incentives: Both could choose to stay private indefinitely given access to private capital. (5) The question resolves YES only if Anthropic confirms IPO first — a specific ordering condition. The long time horizon (2040) means both companies will almost certainly face pressure to provide liquidity to investors. The key variable is whether OpenAI's IPO comes first (given its older age and more active restructuring discussions). Recent news suggests OpenAI has been more actively discussing public markets, but Anthropic has major corporate backers (Google, Amazon) who may push for liquidity. Reference class: among pairs of competing tech companies at similar stages, the older/larger one tends to IPO first (Google before Meta's era, etc.).
2. Research Parallel tool calls · legacy v2
ToolStatusTimeItemsSummary
kalshi_data OK 2.2s -
kalshi_orderbook OK 0.3s -
article_search OK 0.8s -
web_search OK 63.7s -
earnings_data OK 1.4s -
wikipedia_lookup OK 2.6s -
code_execution OK 0.0s -
3. Evidence Synthesis Sonnet · 22 items · legacy v2
#StrengthCredibilityDirectionSourceClaimPriced In
1 STRONG 72 ↑ UP kalshi_data Kalshi market KXOAIANTH-40-ANTH prices Anthropic IPOing first (before OpenAI) at 68%, down 3% in 7 days and down 10% in 30 days, with moderate volume (~350 contracts/day). Yes
2 STRONG 62 ↑ UP web_search Multiple reports from April-May 2026 suggest Anthropic is targeting an October 2026 IPO at a potential $1 trillion valuation, has engaged IPO law firm Wilson Sonsini, held preliminary investment bank conversations, and formed a $1.5B Wall Street joint venture on May 4, 2026. No
3 STRONG 80 ↓ DOWN article_search OpenAI shared a document resembling an IPO prospectus with investors in March 2026, explicitly noting Microsoft reliance as a risk, indicating OpenAI is also actively preparing for a near-term IPO. Yes
4 MODERATE 75 ↓ DOWN article_search OpenAI raised $110B+ from strategic partners (Amazon, Nvidia, etc.) in early 2026 and multiple articles reference an 'expected IPO,' suggesting OpenAI may be on a parallel or faster IPO trajectory than Anthropic. Yes
5 MODERATE 70 ↓ DOWN article_search OpenAI was founded in 2015 (older by 6 years than Anthropic, founded 2021) and has a more mature corporate restructuring underway from capped-profit LLC to fully for-profit PBC, which typically precedes an IPO. Yes
6 MODERATE 78 ↑ UP article_search Elon Musk is actively suing OpenAI in April-May 2026 trial, seeking Sam Altman's ouster, which creates governance uncertainty that could delay OpenAI's IPO plans. Yes
7 WEAK 35 ↓ DOWN code_execution Base rate analysis of comparable tech unicorn IPO timelines yields a rough probability of ~46% that Anthropic IPOs before OpenAI, based on historical founding-to-IPO timing distributions. No
8 MODERATE 65 NEUTRAL web_search Anthropic's Pentagon blacklisting dispute (resolved in Anthropic's favor by court in March 2026) created short-term business uncertainty, but Anthropic won public goodwill and new subscribers, potentially strengthening its IPO narrative. Yes
9 STRONG 60 ↑ UP web_search Anthropic's annual revenue run rate has surpassed $30B as of May 2026, is raising what is described as its 'last private round' before going public, and is targeting an IPO with a potential $1 trillion valuation, possibly in October 2026. No
10 MODERATE 62 ↓ DOWN web_search Anthropic is not yet cash flow positive and doesn't expect to become so until 2028, which could delay IPO timing even if IPO preparations are underway. No
11 MODERATE 58 ↓ DOWN web_search Anthropic raised at a $380B valuation in February 2026 and is reportedly seeking a new round targeting $900B valuation, suggesting the company still has strong access to private capital and may not urgently need public markets. No
12 MODERATE 65 ↑ UP web_search Anthropic has engaged IPO-specialist law firm Wilson Sonsini and held preliminary investment bank conversations as of early 2026, indicating active preparatory steps toward a public offering. No
13 MODERATE 68 ↑ UP web_search On May 4, 2026, Anthropic formed a $1.5B joint venture with Blackstone, Goldman Sachs, and Hellman & Friedman, deepening Wall Street relationships that typically precede public listings. No
14 MODERATE 42 ↑ UP code_execution Historical base rate analysis shows 100% of comparable tech unicorns IPO'd within 19 years of founding; Anthropic has until 2040 (19 years from 2021 founding), suggesting near-certain eventual IPO under 2040 deadline. No
15 MODERATE 65 ↑ UP article_search Anthropic's major corporate investors Amazon (committed $4B+) and Google (committed billions) create strong pressure for liquidity events over the 14-year horizon to 2040. Yes
16 WEAK 38 ↑ UP article_search The Musk vs. OpenAI lawsuit (April-May 2026 trial) and OpenAI's governance complexity could create market conditions favorable to Anthropic as an alternative AI IPO candidate. No
17 STRONG 82 ↑ UP article_search OpenAI circulated a document with IPO prospectus-like sections ('Risks Related to the Transaction', 'Risks Related to our Business') to investors in March 2026 alongside its latest funding round, suggesting active IPO preparation. Yes
18 STRONG 78 ↑ UP article_search Multiple news articles from March 2026 reference OpenAI's 'expected IPO' explicitly, and OpenAI raised $110B+ from Amazon, Nvidia and other strategic partners in early 2026, suggesting a near-term path to public markets. Yes
19 STRONG 80 ↓ DOWN article_search Elon Musk's ongoing lawsuit (trial April-May 2026) seeks Sam Altman's ouster and challenges OpenAI's for-profit restructuring, creating significant governance and legal uncertainty that could delay an OpenAI IPO. Yes
20 MODERATE 72 ↓ DOWN article_search OpenAI's corporate restructuring from nonprofit-controlled capped-profit entity to a fully for-profit PBC is still ongoing and not yet completed, which is a prerequisite for a standard IPO. Yes
21 MODERATE 55 ↓ DOWN web_search Anthropic is reportedly targeting an October 2026 IPO window, which if realized would come before OpenAI completes its restructuring and resolves its governance/legal issues — meaning Anthropic could IPO first. No
22 MODERATE 65 ↑ UP kalshi_data Kalshi market implicitly prices OpenAI IPOing first at approximately 32% (complement of the 68% Anthropic-first market price), with the market trending toward OpenAI-first over the past 30 days (price up 10% for NO/OpenAI-first outcome). Yes
Information Gaps
  • No confirmed official IPO filing (S-1) from either Anthropic or OpenAI — all IPO signals are preparatory/speculative
  • No data on the current status of OpenAI's nonprofit-to-PBC restructuring completion timeline
  • No information on outcome of Musk v. OpenAI trial and whether it results in injunction blocking OpenAI's restructuring
  • No information on whether Anthropic's October 2026 IPO target is based on official internal communications or analyst speculation
  • No data on Amazon's or Google's contractual rights or preferences regarding an Anthropic IPO/liquidity event
  • No clarity on whether Anthropic's $900B valuation round (reportedly imminent as of April 30, 2026) closes before or instead of an IPO
  • No information on regulatory environment for AI company IPOs (SEC scrutiny, AI-specific disclosure requirements)
  • No data on OpenAI's revenue run rate or profitability trajectory compared to Anthropic's $30B ARR
  • No information on whether either company has received informal SEC guidance or begun quiet IPO preparation processes
  • The Kalshi orderbook shows an extreme spread ($0.01 bid on both sides with depth of 16,670) suggesting the market data may be stale or the market structure unusual — reliability uncertain
Key Uncertainties
  • Outcome of Musk v. OpenAI trial: an injunction blocking restructuring would significantly delay OpenAI IPO and benefit Anthropic-first scenario
  • Whether Anthropic's 'October 2026 IPO' reports reflect genuine internal planning or speculative journalism
  • Whether Anthropic closes another massive private round ($900B target) instead of proceeding to IPO — private capital access reduces IPO urgency
  • Timing of OpenAI's for-profit restructuring completion, which is a hard prerequisite for its IPO
  • Market conditions in 2026-2027: a tech market downturn could delay both IPOs, but may affect the larger/more capital-intensive OpenAI more
  • Whether Anthropic's Pentagon conflict and subsequent lawsuit resolution permanently affects government revenue potential and IPO valuation story
  • Whether either company faces M&A (e.g., acquisition by Amazon, Google, or Microsoft) that would preclude an IPO entirely
  • AI sector disruption risk: competitive dynamics from Chinese AI firms or open-source models could weaken both companies' IPO narratives
  • Regulatory risk: potential AI-specific legislation could complicate IPO disclosures for either company
Market Context
Price: 0.68 · 7d: -0.03 · 30d: -0.10
Volume: MODERATE · Depth: HIGH
Reliability: LOW-MEDIUM — the orderbook shows $0.01 bids on both sides with a $0.98 spread which is highly anomalous and suggests either stale data or an illiquid/inactive market structure despite the listed depth of 16,670; the price trend (falling 10% in 30 days) may reflect genuine information about OpenAI gaining IPO momentum, but market microstructure is questionable
4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price
Independent estimate: 59% (40% confidence)
base rate
56%
40% conf
evidence driven
62%
40% conf
contrarian
60%
40% conf
Spread
6pp
Low disagreement
sq1: Will Anthropic IPO before OpenAI does?
58%
Base rate: In paired competing tech companies, the older/more mature one typically IPOs first (~55-60% of the time the older firm wins). OpenAI is 6 years older. However, specific evidence flips this: (1) Anthropic has concrete Oct 2026 IPO target, engaged Wilson Sonsini, formed Wall Street JV May 2026 — pushes UP ~10-15%. (2) OpenAI's Musk lawsuit trial actively underway, restructuring not complete — pushes UP for Anthropic ~8-10%. (3) OpenAI also circulated prospectus-like document and has 'expected IPO' references — pushes DOWN ~10%. (4) Anthropic's simpler PBC structure vs OpenAI's complex nonprofit-to-PBC restructuring — pushes UP ~5%. Net: Anthropic has modest edge due to cleaner governance and concrete near-term timeline, while OpenAI faces legal/structural delays. Estimate: 58%.
sq2: Will Anthropic IPO at all before January 1, 2040?
85%
Base rate: ~95-100% of tech unicorns at this scale eventually IPO or get acquired within ~19 years. Over 14 years, IPO is highly likely. Evidence pushing UP: $30B ARR, active IPO preparation, Wall Street JV, investor pressure from Amazon/Google for liquidity. Evidence pushing DOWN: possible acquisition (small probability ~10%), possible AI sector collapse/disruption (~5%), staying private indefinitely via continued private capital (~5%). Risk factors: not cash flow positive until 2028, regulatory/AI-specific risks. Combined non-IPO outcomes ~15%. Estimate: 85%.
sq3: Will OpenAI IPO before Anthropic does?
35%
This is roughly the complement of sq1, minus scenarios where neither IPOs or Anthropic doesn't IPO. If P(Anthropic first) ~58% and P(neither/Anthropic doesn't go) ~15%, then P(OpenAI first) ~ 35%. OpenAI has IPO prospectus circulation and active preparation pushing UP, but Musk lawsuit and incomplete restructuring push DOWN. Estimate: 35%.
Show full reasoning trace
base rate: Historical base rate for younger competitor IPOing before older competitor: ~40-45%. Base rate for top-tier unicorn IPO within 14 years: ~85-95%.
evidence updates: Strong UP for Anthropic-first: concrete Oct 2026 timeline, Wilson Sonsini engagement, $1.5B Wall Street JV, OpenAI's Musk lawsuit and incomplete restructuring. Strong DOWN: OpenAI's prospectus-like document circulation suggests parallel IPO track. Net tilts modestly toward Anthropic-first.
combination method: The question requires Anthropic to confirm IPO first. Combining sq1 (direct answer, 58%) and sq2 (necessary condition, 85%) with sq3 as inverse check. Weighted resolution lands around 55-58%.
final: Anthropic has a modest but real edge driven by simpler corporate structure, concrete near-term IPO preparation, and OpenAI's governance/legal headwinds. The 14-year horizon makes the conditional probability question (which IPOs first) the dominant factor. Final: 56%.
ensemble: {'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.56, 'confidence': 0.4}, 'evidence_driven': {'p_yes': 0.62, 'confidence': 0.4}, 'contrarian': {'p_yes': 0.6, 'confidence': 0.4}}, 'spread': 0.06, 'individual_p_yes': {'base_rate': 0.56, 'evidence_driven': 0.62, 'contrarian': 0.6}}
5. Devil's Advocate Sonnet · legacy v2 Market price revealed
Reasoning Flaw Missing Info
Challenges
  1. Question wording matters: 'Will OpenAI or Anthropic IPO first?' typically resolves YES if Anthropic IPOs first (given Kalshi's KXOAIANTH-40-ANTH ticker maps to Anthropic). The forecaster correctly interpreted this, but should verify resolution criteria — if the question resolves YES on either company IPOing first by 2040, the answer would be much higher (~85%+). Confirm the resolution interpretation explicitly.
  2. Math inconsistency: sq1 says P(Anthropic first) = 58%, but sq2 says P(Anthropic IPOs at all by 2040) = 85%. P(Anthropic first) cannot exceed P(Anthropic IPOs at all), which is fine, but the forecaster's combined 59.3% essentially just uses sq1. The 85% ceiling from sq2 is barely binding. However, sq1 of 58% already implicitly conditions on Anthropic IPOing — so multiplying or combining with sq2 would double-count. The combination logic is muddled.
  3. The forecaster cites a 'base rate' of 40-45% for younger competitor IPOing first, then updates to 58% based on evidence. But the evidence (concrete Oct 2026 timeline, Wilson Sonsini, $1.5B JV, Musk lawsuit blocking OpenAI) is quite strong and specific. An update of only +13-18 points from a 40-45% base may be under-weighting the specific near-term catalysts. Anthropic having a concrete Oct 2026 target while OpenAI is mired in litigation/restructuring is a strong signal for the next 6-12 months, which dominates a 14-year question because whichever company IPOs first locks in resolution.
  4. Confidence of 0.4 seems reasonable but the ensemble spread (0.06) is very tight, suggesting false precision. With 4987 days to resolution and major structural uncertainties (AI sector risk, acquisition risk, regulatory risk), the true uncertainty is wider.
  5. The forecaster notes the Kalshi orderbook is anomalous (penny bids both sides) but the LAST PRICE of 68% with a 30-day downtrend of -10% suggests real trading activity. The market moving from ~78% to 68% over 30 days indicates traders are updating toward OpenAI catching up — this is informational signal the forecaster could weigh more, though not decisively.
Suggested adjustment: +5pp
The forecaster appears to under-weight the specificity and near-term nature of Anthropic's IPO preparation (concrete Oct 2026 target, Wilson Sonsini, $1.5B Wall Street JV formed days before forecast date) relative to OpenAI's clear structural/legal headwinds (active Musk trial, incomplete restructuring). When one party has a concrete near-term path and the other is blocked, the 'who first' question is heavily front-loaded — the next 12 months matter more than the next 14 years. A modest upward adjustment to ~0.64 better reflects this asymmetry, which coincidentally aligns with the market but is justified on reasoning grounds.
Market comparison: Forecaster: 59.3%, Market: 68%. The 8.7-point divergence is modest. Market reliability is questionable due to anomalous orderbook, but the 30-day downtrend from ~78% to 68% suggests genuine trading reflecting OpenAI's IPO momentum signals. The forecaster's reasoning has some weight-balancing issues that, if corrected, would push the estimate slightly higher independent of market price.
6. Aggregator Opus · final calibrated forecast
64% (35% confidence)
Anthropic has concrete near-term IPO catalysts (Oct 2026 target, Wilson Sonsini engagement, $1.5B Wall Street JV formed days before forecast) while OpenAI is bogged down in the Musk litigation and incomplete for-profit restructuring — and because this is a 'first to IPO' question, the next 12 months dominate the 14-year horizon. I partially accept the critic's argument that I under-weighted these front-loaded catalysts (adjusting up from 0.59 to 0.64) but reject going to 0.68+ because OpenAI's prospectus-like circulation indicates parallel preparation and the older/more-mature firm base rate still pulls modestly against Anthropic. The market at 0.68 is close to my adjusted estimate; the small remaining gap reflects skepticism about the anomalous orderbook (penny bids both sides) and the possibility that the 30-day drift from 78% reflects real OpenAI progress I'm appropriately discounting given microstructure concerns.