Will Anthropic or OpenAI IPO first?

Based on publicly stated timelines and IPO Readiness Scores, Anthropic is targeting an IPO in October 2026, while OpenAI is targeting Q4 2026 or Q1 2027. Both have IPO Readiness Scores above 90. Anthropic (94/100) has a slightly higher readiness score than OpenAI (93/100). Either could list first depending on market conditions.

What is Anthropic's valuation and IPO target?

Anthropic is valued at $380 billion as of April 2026, with $18.5 billion in total funding. The company has publicly stated a target IPO window of October 2026. Key investors include Google, Amazon, and Spark Capital. IPO Readiness Score: 94/100 (Grade A).

What is OpenAI's valuation and IPO target?

OpenAI is valued at $852 billion as of April 2026, with $27 billion in total funding. OpenAI is targeting a public listing in Q4 2026 or Q1 2027. OpenAI restructured from a non-profit to a public benefit corporation in early 2025 to enable an IPO. IPO Readiness Score: 93/100 (Grade A).

Which is the better pre-IPO investment: Anthropic or OpenAI?

This requires individual financial analysis and depends on investment goals, risk tolerance, and entry price. OpenAI is larger and more diversified; Anthropic is arguably the purer AI safety and enterprise AI play. Both are high-conviction IPO candidates. This is not investment advice — consult a licensed financial advisor.

What is the difference between Anthropic and OpenAI structurally?

OpenAI completed restructuring from a capped-profit LLC to a public benefit corporation in early 2025, enabling a conventional IPO. Anthropic was founded as a public benefit corporation from inception. Both structures allow public listing, but OpenAI's restructuring was more complex and took longer to complete.

IPO Comparison

Anthropic vs OpenAI: Which IPOs First?

Last updated: April 22, 2026 · Source: TechStackIPO Database · Company filings

TL;DR — 30-Second Answer

Anthropic targets October 2026 ($380B, IPO Score 94/100). OpenAI targets Q4 2026–Q1 2027 ($852B, IPO Score 93/100). Both are among the most IPO-ready companies tracked. Either could list first — Anthropic has a slightly more defined timeline, OpenAI has a structurally more complex offering.

Head-to-Head Comparison

Metric	Anthropic	OpenAI
Valuation	$380B	$852B
Total Funding	$18.5B	$27B
IPO Readiness Score	94/100 · A	93/100 · A
IPO Target	October 2026	Q4 2026 – Q1 2027
Structure	Public Benefit Corp. (from founding)	Public Benefit Corp. (restructured 2025)
Key Investors	Google, Amazon, Spark Capital	Microsoft, SoftBank, Tiger Global
S-1 Filed	No (as of Apr 2026)	No (as of Apr 2026)
Primary Model	Claude (3.5, 3.7)	GPT-4o, o3, o4-mini

The Case for Anthropic IPO-ing First

Anthropic has the more specific publicly stated timeline: October 2026. The company was structured as a public benefit corporation from its founding in 2021, avoiding the structural restructuring complexity that slowed OpenAI.^[1]

Anthropic's IPO Readiness Score of 94/100 (Grade A) reflects:

Clean corporate structure — no non-profit to for-profit conversion required
Major strategic investors (Google, Amazon) providing both capital and distribution
Enterprise-focused Claude models generating significant B2B revenue
Constitutional AI differentiation in a safety-conscious regulatory environment

The Case for OpenAI IPO-ing First

OpenAI completed its restructuring from a capped-profit LLC to a full public benefit corporation in early 2025, clearing the primary structural barrier to an IPO.^[2] At a $852 billion valuation, OpenAI is nearly 2.25x Anthropic's size — making it one of the largest technology IPOs in history if it proceeds.

OpenAI's IPO Readiness Score of 93/100 (Grade A) reflects:

ChatGPT: 300M+ weekly active users, the most widely used AI product globally
Microsoft partnership generating significant revenue and distribution
API business growing rapidly across enterprise and developer segments
SoftBank's $40B commitment in 2025 signals major institutional confidence

What Could Delay Both?

Regulatory risk is the primary wildcard. Both companies face scrutiny from the EU AI Act, potential U.S. AI regulation, and antitrust concerns around investor relationships (Google invested in both). A regulatory action against either could delay IPO plans significantly.

Anthropic IPO Readiness Stack

Anthropic Full Analysis

IPO score, S-1 signals, funding history, timeline model.

View Anthropic Stack →

OpenAI IPO Readiness Stack

OpenAI Full Analysis

IPO score, restructuring status, revenue signals, timeline.

View OpenAI Stack →

Frequently Asked Questions

Based on stated timelines, Anthropic is targeting October 2026 while OpenAI targets Q4 2026–Q1 2027. Anthropic's simpler corporate structure gives it an advantage for earlier listing. Either company could move first depending on market conditions.

Anthropic scores 94/100 (Grade A) and OpenAI scores 93/100 (Grade A) on TechStackIPO's IPO Readiness Stack. Both are in the top 5% of all 367 companies tracked. The scores account for corporate structure, revenue, funding, S-1 signals, and market timing.

OpenAI is valued significantly higher at $852 billion vs Anthropic's $380 billion as of April 2026. However, valuations on private companies are estimates based on secondary market data and disclosed funding rounds — the IPO will determine the public market value.

Pre-IPO shares in both are available on secondary markets (Forge, Hiive, EquityZen), requiring accredited investor status. Both are highly sought-after with limited supply. Minimum investments typically range $25,000–$100,000+. This is not investment advice.

More IPO Comparisons

When will SpaceX IPO? → When will Stripe IPO? → Top 10 pre-IPO AI companies 2026 → AI Stack — all AI companies tracked →

Sources & Citations

Anthropic corporate structure — Public Benefit Corporation registration, 2021. techstackipo.com/company/anthropic
OpenAI restructuring announcement — conversion to Public Benefit Corporation, 2025. techstackipo.com/company/openai
TechStackIPO database — IPO Readiness Scores for Anthropic and OpenAI, April 2026. techstackipo.com/research
SEC EDGAR — No public S-1 filings for Anthropic or OpenAI as of April 22, 2026. sec.gov/cgi-bin/browse-edgar