ChatGPT Hits 1 Billion Monthly Users as OpenAI Files for $852B IPO

The 1 Billion Milestone in Context

According to market intelligence firm Sensor Tower, ChatGPT reached 1 billion monthly active app users in May 2026 — roughly three years after its November 2022 research preview. No consumer app in history has reached that scale as quickly. TikTok, Instagram, YouTube, and Google Maps all took meaningfully longer to reach equivalent numbers.

OpenAI's own latest public measurement uses a slightly different metric: the company reported surpassing 900 million weekly active users in February 2026, alongside 50 million paying consumer subscribers. Weekly and monthly figures aren't directly comparable, but by either measure, ChatGPT has become one of the largest consumer software products ever built.

The growth has translated directly into market position. ChatGPT commands 6x the monthly web visits and mobile sessions of the next largest AI app, and accounts for 4x the total AI time spent compared to all other AI apps combined, according to OpenAI data.

The Revenue Machine Behind the Users

The business metrics behind those user numbers are equally striking. OpenAI reached $1 billion in annual revenue within a year of launching ChatGPT — a pace matched by almost no technology company in history. By end of 2024, it was generating $1 billion per quarter. In 2026, it generates $2 billion per month.

More than 40% of OpenAI's revenue now comes from enterprise, a segment on track to match consumer revenue by year-end. The company's APIs process over 15 billion tokens per minute. Codex, its AI coding agent, has surpassed 2 million weekly users — up 5x in three months — with usage growing more than 70% month over month.

The $122 Billion Round and the IPO Filing

In March 2026, OpenAI closed the largest private funding round in Silicon Valley history: $122 billion at an $852 billion post-money valuation. The round was anchored by SoftBank, Amazon, Nvidia, and Microsoft, with participation from a16z, D.E. Shaw, ARK Invest, Blackrock, Coatue, Sequoia, and dozens more. For the first time, OpenAI also extended participation to individual investors through bank channels, raising over $3 billion from retail participants.

On June 8, 2026, OpenAI filed a confidential draft S-1 registration statement with the SEC. Goldman Sachs and Morgan Stanley are reported as lead underwriters. A September 2026 public debut has been reported, though OpenAI has not confirmed timing. Analysts expect the final IPO valuation to range between $852 billion and $1 trillion.

Billion Users ≠ Billion Dollars (Yet)

Wall Street analysts are watching whether OpenAI can convert its user base into durable revenue. The company plans to spend $600 billion on AI infrastructure by 2030 and currently burns roughly $14 billion annually, with profitability still years away. A $1 trillion IPO valuation would demand proving that the $2B/month revenue trajectory continues to accelerate.

But the signals are encouraging. OpenAI's ad pilot reached $100 million ARR in under six weeks. The consumer-to-enterprise migration path — where ChatGPT familiarity in daily life translates into corporate adoption — is playing out measurably. And the "AI superapp" strategy — unifying ChatGPT, Codex, browsing, and agentic capabilities under a single interface — is designed to lock in both consumer habit and enterprise workflow dependency.

AI User Landscape 2026