Will OpenAI's valuation hit (LOW) $500B by December 31?

As of August 23, 2026, Polymarket prices “Will OpenAI's valuation hit (LOW) $500B by December 31?” at 6% YES with $56K traded. No tracked wallet holds a position on this market, so there is no verdict.

Prediction markets put the probability at 8%: Will OpenAI's valuation hit (LOW) $500B by December 31. Currently, markets see this as unlikely (8% YES).

What’s Happening

Whether OpenAI's valuation hit (low) $500B by December 31 traces back to a pivotal stretch in August 2025, when the ChatGPT maker entered early-stage discussions about a secondary employee stock sale that could value the company at roughly $500 billion. That figure marked a steep climb from the $300 billion valuation set in the March 2025 financing round led by SoftBank. On the same day the talks surfaced, OpenAI released two open-weight language models positioned as lower-cost options, underscoring a dual strategy of premium fundraising alongside broader model access. [CNBC, Aug 06]

The scale of the number matters because OpenAI has become what analysts describe as the tech boom's "key man risk" — a single company whose trajectory underpins broad investor exposure to artificial intelligence. Reporting at the time noted annualized revenue on a steep growth curve, with roughly $4.3 billion generated in the first portion of 2025. The question of whether OpenAI's valuation hit (low) $500B by December 31 became a benchmark for how far private-market enthusiasm could stretch, given a valuation timeline that had advanced from $1 billion in 2019 to the half-trillion mark within six years. [Reuters, Aug 07]

Subsequent developments extended the trajectory well beyond the original threshold. Reporting placed OpenAI's valuation at an unconfirmed $500 billion in October 2025, followed by an unverified $852 billion by March 2026, alongside run-rate revenue cited near $2 billion per month — about $24 billion annualized. A reported $122 billion raise was framed as an IPO rehearsal, tied to a $600 billion compute commitment spanning Microsoft Azure, Oracle, Amazon Web Services, CoreWeave, and Google Cloud. Analysts flagged that some jumps lacked corroborating financial disclosure, leaving the pace of repricing under scrutiny as OpenAI's infrastructure obligations continued to expand. [Tech-insider, Jun 04]

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