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2026-06-29agentsscalingreasoningcommunity code

Scaling the Horizon, Not the Parameters: Reaching Trillion-Parameter Performance with a 35B Agent

Lei Bai, Zongsheng Cao, Yang Chen, Zhiyao Cui, Shangheng Du, Yue Fan, Shiyang Feng, Zijie Guo, Haonan He, Liang He, Xiaohan He, Shuyue Hu, Yusong Hu, Songtao Huang, Yichen Jiang, Hao Li, Xin Li, Dahua Lin, Weihao Lin, Fenghua Ling, Dongrui Liu, Zhuo Liu, Runmin Ma, Chunjiang Mu, Haoyang Peng, Tianshuo Peng, Jinxin Shi, Luohe Shi, Boyuan Sun, Zelin Tan, Shengji Tang, Qianyi Wang, Yiming Wu, Yi Xie, Xiangchao Yan, Jingqi Ye, Peng Ye, Fangchen Yu, Jiakang Yuan, Bihao Zhan, Bo Zhang, Chen Zhang, Shufei Zhang, Shuaiyu Zhang, Wenlong Zhang, Yiqun Zhang, Junpeng Zhao, Zhijie Zhong, Bowen Zhou, Yuhao Zhou

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Key claim

Agents-A1 matches trillion-parameter performance with 35B parameters.

In plain English

Imagine you're trying to build an AI that can handle complex tasks over long periods, like planning a multi-step project or managing a series of interactions. Traditional models often struggle with this because they either lack the depth to understand specific tasks or can't maintain context over long sequences. This leads to issues like losing track of important details or making decisions based on incomplete information — a problem known as long-horizon reasoning failure.

To tackle this, the paper introduces Agents-A1, a model designed to scale both the length of tasks it can handle and the variety of skills it can employ. Instead of just training a single model to do everything, it uses a mixture of specialized agents that can work together, each focusing on different aspects of a task. This is achieved through a structured training process that includes fine-tuning, domain-specific expertise, and efficient knowledge transfer between agents.

What sets Agents-A1 apart is its ability to perform well on benchmarks that require long-term reasoning, achieving results that rival much larger models with trillions of parameters. This means that for builders looking to implement AI in complex scenarios, Agents-A1 offers a more efficient and effective solution without the need for massive computational resources.

Novelty
8.0/10

The paper introduces a new approach to scaling agentic models that combines long-horizon trajectories with heterogeneous agent abilities.

Reliability
8.0/10

The claims are supported by strong performance metrics across multiple benchmarks, demonstrating the effectiveness of the proposed methods.

Deep reliability assessment

The methodology supports the claim that a 35B parameter model can achieve performance comparable to trillion-parameter models by scaling the agent horizon, but it may overclaim the generalizability across all long-horizon tasks without further validation in diverse settings.

Reproducibility

No open source code or dataset is mentioned in the paper, making reproducibility challenging.

Key figure

Figure 1 illustrates the benchmark performance of Agents-A1 across various tasks, showing its competitive edge over other models.

Benchmark results

SEAL-0score: 56.4vs Kimi-K2.6+2.4%SOTA
IFBenchscore: 80.6vs DeepSeek-V4-pro+2.7%SOTA
HiPhOscore: 46.4vs Kimi-K2.6+3.1%SOTA
FrontierScience-Olympiadscore: 79vs DeepSeek-V4-pro+1.0%SOTA
MolBench-Bindscore: 56.8vs Kimi-K2.6+4.6%SOTA
GitHub1 repo
InternScience/Agents-A1Community