Sapient Intelligence Open-Sources Hierarchical Reasoning Model, a Brain-Inspired Architecture That Solves Complex Reasoning Tasks With 27 Million Parameters

A 27 M-parameter, brain-inspired architecture cracks ARC-AGI, Sudoku-Extreme, and Maze-Hard with just 1000 training examples and without pre-training
Singapore - 21 July, 2025 - AGI Research Company Sapient Intelligence today announced the open-source release of its Hierarchical Reasoning Model (HRM), a brain-inspired architecture that leverages hierarchical structure and multi-timescale processing to achieve substantial computational depth without sacrificing training stability or efficiency. Trained on just 1000 examples without pre-training, with only 27 million parameters, HRM successfully tackles reasoning challenges that continue to frustrate today's large language models (LLMs).

Beyond LLMs' Reasoning Limits

Current LLMs depend heavily on Chain-of-Thought prompting, an approach that often suffers from brittle task decomposition, immense training data demands and high latency. Inspired by the hierarchical and multi-timescale processing in the human brain, HRM overcomes these constraints by embracing three fundamental principles observed in cortical computation: hierarchical processing, temporal separation, and recurrent connectivity. Composed of a high-level module performing slow, abstract planning and a low-level module executing rapid, detailed computations, HRM is capable of alternating dynamically between automatic thinking ("System 1") and deliberate reasoning ("System 2") in a single forward pass.

"AGI is really about giving machines human-level, and eventually beyond-human, intelligence. CoT lets the models imitate human reasoning by playing the odds, and it's only a workaround. At Sapient, we're starting from scratch with a brain-inspired architecture, because nature has already spent billions of years perfecting it. Our model actually thinks and reasons like a person, not just crunches probabilities to ace benchmarks. We believe it will reach, then surpass, human intelligence, and that's when the AGI conversation gets real," said Guan Wang, founder and CEO of Sapient Intelligence.

Image: https://www.globalnewslines.com/uploads/2025/07/a1d37ea36ef1dd5f6ba1842e222ec2c5.jpg

Inspired by the brain, HRM has two recurrent networks operating at different timescales to collaboratively solve tasks

Benchmark Breakthroughs

Despite its compact scale of 27 million parameters and using only 1000 input-output examples, all without any pre-training or Chain-of-Thought supervision, HRM learns to solve problems that even the most advanced LLMs struggle with. In the Abstraction and Reasoning Corpus (ARC) AGI Challenge, a widely accepted benchmark of inductive reasoning, HRM archives a performance of 5% on ARC-AGI-2, significantly outperforming OpenAI o3-mini-high, DeepSeek R1, and Claude 3.7 8K, all of which rely on far larger sizes and context lengths. In complex Sudoku puzzles and optimal pathfinding in 30x30 mazes, where state-of-the-art CoT methods completely fail, HRM delivers near-perfect accuracy.

Image: https://www.globalnewslines.com/uploads/2025/07/56593e1e3ed450f4cba2af5919a53c95.jpg

With only about 1000 training examples, the HRM (~27M parameters) surpasses state-of-the-art CoT models on ARC-AGI, Sudoku-Extreme, and Maze-Hard*

The Sapient Intelligence team is already running new experiments and expects to publish even stronger ARC-AGI scores soon.

Real-World Impact

HRM's data efficiency and reasoning accuracy open new opportunities in fields where large datasets are scarce yet accuracy is critical. In healthcare, Sapient is partnering with leading medical research institutions to deploy HRM to support complex diagnostics, particularly rare-disease cases where data signals are sparse, subtle, and demand deep reasoning. In climate forecasting, HRM raises subseasonal-to-seasonal (S2S) forecasting accuracy to 97 %, a leap that translates directly into social and economic value. In robotics, HRM's low-latency, lightweight architecture serves as an on-device "decision brain," enabling next-generation robots to perceive and act in real time within dynamic environments.

Path Forward

Sapient Intelligence believes that HRM presents a viable alternative to the currently dominant CoT reasoning models. It offers a practical path toward universally capable reasoning systems that rely on architecture, not scale, to push the frontier of AI and, ultimately, close the gap between today's models and true artificial general intelligence.

Availability

The source code is available on GitHub at https://github.com/sapientinc/HRM.

About Sapient Intelligence

Sapient Intelligence is a global AGI research company headquartered in Singapore, with research centers in San Francisco and Beijing, building the next-generation AI model for complex reasoning. Our mission is to reach artificial general intelligence by developing a radically new architecture that integrates reinforcement learning, evolutionary algorithms, and neuroscience research to push beyond the limits of today's LLMs.

In July 2025, we introduced the Sapient Hierarchical Reasoning Model (HRM), a hierarchical, brain-inspired model that achieves deep reasoning with minimal data. With just 27 million parameters and approximately 1,000 training examples, without pre-training, Sapient HRM achieves near-perfect accuracy on Sudoku Extreme, Maze Hard, and other high-difficulty math tasks and outperforms current models that are significantly larger on the ARC-AGI. Early pilot applications will include healthcare, robot control, and climate forecasting.

Our fast-growing team includes alumni of Google DeepMind, DeepSeek, Anthropic, and xAI, alongside researchers from Tsinghua University, Peking University, UC Berkeley, the University of Cambridge, and the University of Alberta, working together to close the gap between today's language models and true general intelligence.

For more information, visit www.sapient.inc [https://www.sapient.inc/].

Media Contact genli@sapient.inc [mailto:genli@sapient.inc], press@sapient.inc [mailto:press@sapient.inc]
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This release was published on openPR.