Arcee AI: A US-based Open Intelligence Lab

Three frontier models in six months. All open-weight.

Trinity Models

How We Lead in AI

Models That Matter.

Three releases in six months. Open weights, real benchmarks, no vaporware.

Models That Improve.

Online RL means continuous learning. Deploy once, improve continuously with rapid iteration.

Models That Scale.

Our architectures keep costs low. Frontier performance without frontier pricing.

Our Partners

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IntelIntel
ARMARM
CiscoCisco
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Together.AITogether.AI
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AWSAWS
MicrosoftMicrosoft
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Hugging FaceHugging Face

Latest Blogs

News
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April 1, 2026

Trinity-Large-Thinking: Scaling an Open Source Frontier Agent

Trinity-Large-Thinking is live. A frontier open reasoning model for complex, long-horizon agents and multi-turn tool calling released under Apache 2.0.

News
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January 27, 2026

Trinity Large

A deep dive into Trinity Large, covering architecture, sparsity, training at scale, and why we shipped Preview, Base, and TrueBase checkpoints.

Research
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December 15, 2025

Distilling Kimi Delta Attention into AFM-4.5B (and the Tool We Used to Do It)

Learn how Kimi Delta Attention was distilled into AFM-4.5B using knowledge distillation, long-context training, and Arcee’s open-source DistillKit.

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