OpenAI's September IPO Target Trims Anthropic's Edge to 73¢
Anthropic's IPO-first contract sits at 73% as of Wednesday morning, 13 points off Tuesday's post-filing peak, as OpenAI's own accelerated September timeline draws fresh counter-bets.

YES probability · 24h change
- 24h vol
- $288
- Liquidity
- $31k
- Contract
Anthropic's Polymarket IPO-first contract surged to 86% early Tuesday on news of its confidential SEC filing and settled near 83¢ that evening, then fell to 73% by 05:14 UTC Wednesday as traders repriced around OpenAI's competing September IPO target. The 13-point reversal pares Anthropic's lead from dominant to comfortable.
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