Essential AI has released Rnj-1, our first instrument of intelligence. Learn more →

[ FRONTIER OPEN SOURCE PLATFORM ]

Building Instruments of Intelligence

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Latest Model Release

Announcing Rnj-1: Building Instruments of Intelligence

December 2025Ashish Vaswani

The long-term advancement and equitable diffusion of AI technologies crucially depend on their development in the Open. In the US, a few stalwarts of open-source AI are protecting its future. Today, we are proud to make our first model contribution to the open-source canon with Rnj-1 (an homage to Ramanujan, pronounced "range-1"), a world-class pair of base and instruction-tuned large language models.

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We're commited to the craft of advancing deep learning

About Essential
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In 1950, Claude Shannon’s Theseus showed the world a glimpse of machine adaptation. At Essential AI, we carry that spirit of curiosity and shared progress into the era of frontier models.

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Doing Great Science Matters

Science accelerates when knowledge is shared. Yet today, much of AI progress happens behind closed doors.

    • The open exchange that built modern AI is fading.
    • Breakthroughs are privatized, fragmenting the field.
    • Foundational research takes a back seat.

    Without collaboration, we face slower progress, less innovation, and fewer voices shaping the future of intelligence.

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    Open Science Scales Breakthroughs

    Essential AI's mission is to build an open platform to accelerate the science and engineering of deep learning. We aim to empower researchers and builders by providing:

      • Pretraining focused on frontier STEM and code capabilities.
      • Methodologies grounded in scientific rigor and engineering discipline.

      Recent Publications

      Our publications span a few of the research bets we're making. Read them to learn more about our work, or reach out to us directly.

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      Unlocking the Next Era of AI Advancement

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