OpenAI moves to acquire Neptune.ai as experiment-tracking platform prepares three-month shutdown
Neptune.ai, a platform used by machine learning teams to monitor, debug, and evaluate large-scale model training, has taken to LinkedIn to confirm that it will be acquired by OpenAI.
The update from CEO and founder Piotr Niedzwiedz marks the beginning of a three-month transition period that will see the company’s hosted service shut down, with customers required to export and migrate their data before March 5, 2026.
Acquisition triggers full operational transition
In his LinkedIn announcement, Niedzwiedz said the company has "entered the definitive agreement to be acquired by OpenAI." He added that Neptune will continue supporting AI researchers internally at OpenAI, using its existing tooling to monitor and evaluate frontier-scale models.
Alongside the announcement, Neptune published its Transition Hub detailing steps for both SaaS and self-hosted customers. Hosted users will retain access until March 5, 2026, when the app and API will be turned off and all remaining data deleted. Self-hosted customers are being contacted individually to determine timelines and support arrangements. New sign-ups and trials have been closed with immediate effect.
Neptune confirmed that customer data will not be transferred to OpenAI at any stage of the acquisition process.
Neptune has outlined a fixed set of actions for existing customers. SaaS users will need to export all data before service shutdown, using the Neptune Exporter tool and available API endpoints. The company is also providing migration materials for commonly adopted alternatives such as Weights & Biases and MLflow.
Billing renewals have stopped, and unused paid time will be refunded where applicable. Hosted documentation will remain available until March 5, with archived versions accessible via GitHub thereafter.
The shutdown will remove one of the long-standing experiment-tracking tools used within the machine learning ecosystem, meaning customers now face a compressed decision window to move training metadata, artifacts, and logs to a new service.
Internal focus shifts toward OpenAI’s AGI roadmap
Niedzwiedz described the acquisition as an opportunity to contribute directly to OpenAI’s research workflows, stating that Neptune will "continue to support AI researchers with tools to monitor, debug, and evaluate frontier models." He also emphasized the longer-term alignment with OpenAI’s AGI ambitions.
The decision to wind down the external product reflects a full pivot toward internal integration with OpenAI’s research stack. According to Neptune, the move includes shutting down the hosted platform entirely rather than offering a scaled-down public version.
Users querying data continuity were told that all hosted content will be deleted at the moment of shutdown unless exported beforehand. Support remains available during the transition period via email and the company’s portal.
Reflecting on the milestone and the years building Neptune, Niedzwiedz wrote that "I am truly grateful to our customers, investors, co-founders, and colleagues who have made this journey possible… I believe this is only the beginning."
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