Analysis
Anthropic and OpenAI both have draft S-1 filings in motion with the SEC at the same time this year, per Pulse's own IPO tracking, but the two companies' public posture toward their own IPO timelines could hardly read more differently.
Anthropic: racing toward a specific, enormous benchmark
Anthropic's public trajectory has been unusually aggressive in signaling scale. The company confidentially filed its draft S-1 on June 1, working with Morgan Stanley, Goldman Sachs and JPMorgan, and by mid-August CFO Krishna Rao was already leading early investor meetings ahead of a possible public filing by the end of the month. The company's stated ambition -- to match or exceed SpaceX's record $86.2 billion raise -- is grounded in disclosed operating momentum: a $65 billion annualized revenue run rate as of July, up roughly sevenfold from late 2025, with some investors modeling a valuation above $2 trillion based on that growth trajectory, though Anthropic itself hasn't confirmed a specific number.
“## OpenAI: a more measured public posture OpenAI's own confidential S-1 process has drawn far less public signaling around size or timeline.”
OpenAI: a more measured public posture
OpenAI's own confidential S-1 process has drawn far less public signaling around size or timeline. CFO Sarah Friar has said publicly that OpenAI isn't racing to beat Anthropic to market -- a notably different framing from Anthropic's own explicit SpaceX-scale ambition. That doesn't necessarily mean OpenAI's listing will actually come later; a company can be further along in its confidential filing process than its public statements suggest, and declining to frame the situation as competitive is itself a communications choice that doesn't reveal much about the underlying timeline.
Why the difference in posture matters
The two companies' different public framing likely reflects different strategic calculations about what serves each of them best heading into a roadshow. Anthropic explicitly targeting a SpaceX-matching size creates its own pressure -- investors will hold the company to that benchmark once it's public, and falling meaningfully short could read as a disappointment even if the actual raise is still enormous by any conventional measure. OpenAI's more understated posture leaves more room to manage expectations upward without having pre-committed to a specific record-breaking target.
What the eventual first-mover gets, and risks
Whichever company files and completes its IPO first will set the market's first real test of how public investors price a frontier AI lab at the scale both companies now operate. That first pricing becomes an unavoidable comparison point for whichever company lists second, regardless of how either company frames the relationship publicly now -- a strong debut from the first mover raises the bar for the second; a disappointing one invites skepticism the second company will have to actively work to overcome.
The counterweight
Both companies' confidential S-1 processes remain subject to change, and neither has committed to a specific public filing date -- Anthropic's "as soon as the end of August" timeline and OpenAI's more open-ended posture could both slip for reasons unrelated to either company's actual readiness, from market conditions to regulatory review timing. It's also worth treating the SpaceX-scale comparison skeptically on its own terms: Pulse has covered how SpaceX's own stock dipped below its IPO price within weeks of its record-setting debut, a reminder that matching a record IPO size on day one says nothing about where either Anthropic or OpenAI's stock actually trades months later.
