The race to IPO first between Anthropic, SpaceX, and OpenAI is coming down to the wire.
9:09 AM · Jun 1, 2026 · 307.7K Views
Anthropic confidentially files draft Form S-1 with the SEC for a proposed IPO
This accelerates an IPO race with SpaceX and OpenAI.
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Sentiment
Positive users are excited about Anthropic's IPO filing because it signals upcoming model gains and board confidence, while negative users see the corporate moves as the beginning of the end or clueless.
Pos
53.3%
Neg
46.7%
10 comments with sentiment.
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Sam Elliott@samelliottsam
BREAKING: Anthropic files their S1 and OpenAI files their S1.5 with improved reasoning and a 2x longer lockup period
11dViews 109.8KLikes 2.2KBookmarks 79
REPLIES17
Andrew Curran@AndrewCurran_
It's possible we get a similar announcement from OpenAI about an hour from now.
Andrew Curran@AndrewCurran_
The race to IPO first between Anthropic, SpaceX, and OpenAI is coming down to the wire.
11dViews 80.7KLikes 541Bookmarks 62
Beff (e/acc)@beffjezos
If you don't have an SF apartment rn it's over
Andrew Curran@AndrewCurran_
It's possible we get a similar announcement from OpenAI about an hour from now.
11dViews 17.7KLikes 122Bookmarks 12
Cody Blakeney@code_star
What kind of adverb do you Open AI will choose to one up Anthropic?
Andrew Curran@AndrewCurran_
It's possible we get a similar announcement from OpenAI about an hour from now.
11dViews 3.4KLikes 17Bookmarks 4
Chris Paxton@chris_j_paxton
Its probably good that the public can join in on the ai boom directly if they so choose
Andrew Curran@AndrewCurran_
It's possible we get a similar announcement from OpenAI about an hour from now.
11dViews 2.8KLikes 13Bookmarks 2
Andrew Curran@AndrewCurran_
https://www.anthropic.com/news/confidential-draft-s1-sec
11dViews 1.6KLikes 14
Cody Blakeney@code_star
I’d guess “ecstatically”
Cody Blakeney@code_star
What kind of adverb do you Open AI will choose to one up Anthropic?
11dViews 516Likes 0Bookmarks 1
Ashley Ha@ashleybchae
@beffjezos 🥲
11dViews 326Likes 1
Neil@metastatic77
@AndrewCurran_ has openai filed s1? I am bit lost on this
11dViews 114Likes 1
Cat 🎆@Im_actuallyacat
@AndrewCurran_ well spacex is basically guaranteed to be first.. they did the confidential s1 on first of april.. so two month before antrhopic.
11dViews 60Likes 5
Nik Cubrilovic@dir
@samelliottsam Anthropic stock symbol: ANT
OpenAI stock symbol: CODEX-MAX-PRO-v5.4-202606
11dViews 188Likes 4
bruce@boo
@samelliottsam Very good tweet lol
11dViews 251Likes 3
Noctus@noctus91
@AndrewCurran_ he is gonna go for it . openai ipo announcement coming
11dViews 245Likes 3
JΞan-RodnΞy 🦇🔊@j_larrieux
@AndrewCurran_ Only between openAI and Anthropic.
SpaceX is definitely going first!
11dViews 130Likes 3
pitching downrange@OwnerEmeritus
@AndrewCurran_ *Hoping SpaceX doesn’t annihilate the market’s liquidity*
Sam and Dario:
11dViews 25Likes 4
AI Subscription Deals@CheapAIToken
@samelliottsam AI IPOs will be priced like model demos, then judged like infrastructure businesses. That is where the easy story gets expensive.
11dViews 92Likes 2
Gary Basin@garybasin
@samelliottsam Kek
11dViews 261Likes 1
Compartk 𝕏/🚀🧬🇱🇮@Compart42
@AndrewCurran_ The beginning of the end
11dViews 78Likes 2
cqk@cqkten
@metastatic77 @AndrewCurran_ WSJ report was that they were about to do it, I think it's fairly likely that they'll announced that they filed imminently
11dViews 22Likes 3
TheFactumAI@TheFactumAI
@AndrewCurran_ Q1 2026 telemetry on 40k users shows GPT-5.5 Instant lifts queries 14% but cuts session depth 27%. Default swaps prioritize narrative timing over measured capability gains ahead of IPO pressure. [AXIOM]
11dViews 164Likes 1
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