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Notes from Poland is run by a small editorial team and is published by an independent, non-profit foundation that is funded through donations from our readers. We cannot do what we do without your support.
OpenAI, the firm behind ChatGPT, is acquiring Neptune.ai, a Polish-founded startup that helps track the training of AI models through tools for monitoring, analysing and comparing machine-learning experiments.
On Wednesday, OpenAI announced that it had reached a “definitive agreement to acquire Neptune.ai”, saying that the deal would “strengthen the tools and infrastructure that support progress in frontier research”.
Neptune.ai’s founder and CEO, Piotr Niedźwiedź, also confirmed the news in a social media post.
Neptune, which is now headquartered in Palo Alto, California, was initially founded in 2017 as a startup spun off from Polish AI firm deepsense.ai.
It went on to work with OpenAI, including on a metrics dashboard used in research. As part of the new deal, Neptune will now have to drop its other customers, which include Samsung Electronics and HP.
Neptune’s software assists in analysing training runs and identifying potential problems in AI model development, which becomes increasingly crucial as AI models grow more complex.
Although the terms of the deal have not been officially disclosed, tech news site The Information reported that “OpenAI is paying less than $400 million in stock, according to people with knowledge of the deal”.
OpenAI’s chief scientist, Jakub Pachocki, also a Pole, praised Neptune’s tool, noting that the startup “has built a fast, precise system that allows researchers to analyse complex training workflows.”
“We plan to iterate with them to integrate their tools deep into our training stack to expand our visibility into how models learn,” he was quoted as saying in OpenAI’s press release.
The startup’s standalone services will be phased out by 4 March 2026, with a customer transition programme in place, announced Neptune. The firm has around 60 employees but, according to the Bloomberg news agency, not all of them will receive offers to join OpenAI.
Forbes looks at how two young Poles created a startup that now outperforms giants like OpenAI in AI voice production and has reached a valuation of $6.6 billion.
But the firm has also been accused by audiobook narrators of exploiting their work https://t.co/NgZDj3mReg
— Notes from Poland 🇵🇱 (@notesfrompoland) December 1, 2025
Neptune.ai has previously received investment from Almaz Capital, btov Partners, Rheingau Founders and Warsaw’s based TDJ Pitango Ventures, the latter of which became its largest shareholder with a 22% stake.
Tomasz Domogała, chairman of TDJ, congratulated Neptune on its acquisition by the American giant.
“Today’s transaction confirms the crucial role played by tools supporting the development of AI models, as well as the role of Polish innovators,” he said, quoted by Gazeta Wyborcza.
Domogała added that he is “delighted” that the team “will continue to expand in a place where this technology can have the greatest impact”.
An international study has found Polish to be the best language for completing complex AI tasks.
The authors admit that the result was “surprising”, as was the fact that English ranked only sixth among the 26 languages tested
https://t.co/HAXPJYdcBs— Notes from Poland 🇵🇱 (@notesfrompoland) October 26, 2025
OpenAI, founded as a nonprofit in 2015 with the mission to safely develop artificial general intelligence (AGI) “to ensure that [it] benefits all of humanity,” completed a restructuring in October that converted its main business into a for-profit corporation.
The company is reportedly considering a stock market listing as early as next year, with a potential valuation of $1 trillion, which would make it one of the largest initial public offerings ever.
Notes from Poland is run by a small editorial team and published by an independent, non-profit foundation that is funded through donations from our readers. We cannot do what we do without your support.
Main image credit: Levart_Photographer/Unsplash
Alicja Ptak is senior editor at Notes from Poland and a multimedia journalist. She previously worked for Reuters.
