OpenAI’s ChatGPT app reaches 1 billion global monthly active users in May, about three years after its launch, making it the fastest app on record to hit that milestone, according to data cited by multiple outlets. Reuters, as reported by PYMNTS, attributes the figures to estimates from Sensor Tower. Business Standard similarly describes the milestone as a record for monthly active users, noting it arrives as competition intensifies in the rapidly expanding AI market, including between OpenAI and Anthropic. The Next Web and other reports frame the figure as a benchmark typically reached by very few apps and often only after several years, but ChatGPT achieves it more quickly than any other app previously tracked. Across the coverage, the common points are the user threshold, the timing (May and roughly three years post-launch), and the reliance on Sensor Tower estimates rather than direct first-party counts. The reports also cite strong growth, including year-over-year growth figures mentioned in the PYMNTS summary.