OpenAI CEO Sam Altman attended an event promoting enterprise AI on February 3, 2025 in Tokyo.
Kim Kyung Hoon | Reuters
OpenAI has entered into a definitive agreement to acquire Neptune, a startup that builds monitoring and debugging tools used by artificial intelligence companies to train models.
Neptune and OpenAI collaborated on metrics dashboards to help teams building foundational models. Neptune CEO Piotr Niedźwiedź said in a blog post that the acquisition will bring the two companies “even closer together.”
Niedźwiedź said the company plans to reduce its external services in the coming months. Terms of the acquisition were not disclosed.
“Neptune has built a fast and accurate system that enables researchers to analyze complex training workflows,” OpenAI Principal Scientist Jakub Pachocki said in a statement. “We plan to work with them iteratively to deeply integrate their tools into our training stack and expand our visibility into how our models learn.”
OpenAI has acquired several companies this year.
In October, the company acquired a small interface startup called Software Applications Incorporated for an undisclosed sum, product development startup Statsig in September for $1.1 billion, and Jony Ive’s AI device startup io in May for more than $6 billion.
Neptune has raised more than $18 million in funding from investors including Almaz Capital and TDJ Pitango Ventures, according to its website. Neptune’s contract with OpenAI remains subject to customary closing conditions.
“We are extremely grateful to our customers, investors, co-founders, and colleagues who have made this journey possible,” Niedojuviedo said. “Although it has already been the ride of a lifetime, I believe this is only the beginning.”
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