Beam

Beam

Reflection
+
+

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About

Beam is Reflection’s first open-weight model, a sparse Mixture-of-Experts model with 501 billion total parameters and 23 billion active parameters, built for coding, reasoning, and agentic workloads. Its capabilities come from large-scale pretraining and reinforcement learning, including training on 23.8 trillion diverse, curated, high-quality tokens from the web, public sources, and proprietary licensed datasets. Beam was trained with a particular focus on coding and agentic performance and is designed to deliver competitive open-weight capabilities with efficient inference compute. It supports complex software engineering, terminal, STEM, web search, tool-use, and general knowledge tasks, with reinforcement learning designed to improve multi-step reasoning, tool use, and adaptation to environment feedback. Users can control the tradeoff between performance and token usage through a reasoning effort parameter.

About

Trinity Large Thinking is a frontier open source reasoning model developed by Arcee AI, designed specifically for complex, multi-step problem solving and autonomous agent workflows that require long-horizon planning and tool use. Built on a sparse Mixture-of-Experts architecture with roughly 400 billion total parameters but only about 13 billion active per token, the model achieves high efficiency while maintaining strong reasoning performance across tasks such as mathematical problem solving, code generation, and multi-step analysis. It introduces extended chain-of-thought reasoning capabilities, allowing the model to generate intermediate “thinking traces” before producing final answers, which improves accuracy and reliability in complex scenarios. Trinity Large Thinking supports a very large context window of up to 262K tokens, enabling it to process long documents, maintain state across extended interactions, and operate effectively in continuous agent loops.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers, AI researchers, and engineering teams requiring a tool to run coding, reasoning, tool-use, and agentic workloads with an efficient open-weight language model

Audience

Developers and enterprises building autonomous AI agents that need a high-performance, open-source reasoning model for complex, multi-step workflows

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

Free
Free Version Supported
Free Trial Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Reflection
United States
reflection.ai/blog/introducing-beam

Company Information

Arcee AI
Founded: 2023
United States
www.arcee.ai/blog/trinity-large-thinking

Alternatives

GLM-5.3

GLM-5.3

Z.ai

Alternatives

Kimi K2 Thinking

Kimi K2 Thinking

Moonshot AI
Kimi K3

Kimi K3

Moonshot AI
Qwen3.8-Max

Qwen3.8-Max

Alibaba
Inkling

Inkling

Thinking Machines Lab
GLM-5.1

GLM-5.1

Z.ai
Qwen3.5

Qwen3.5

Alibaba
LongCat-2.0

LongCat-2.0

LongCat

Categories

AI Models Supported

Categories

AI Models Supported

Integrations

Claude Fable 5 Not Supported
Claude Fable 5.1 Not Supported
Claude Fable 5.5 Not Supported
Claude Haiku 5.5 Not Supported
Claude Mythos 5 Not Supported
Claude Mythos 5.1 Not Supported
Claude Opus 4.6 Not Supported
Claude Opus 4.7 Not Supported
Claude Opus 4.8 Not Supported
Claude Opus 5 Not Supported
Claude Opus 5.5 Not Supported
Claude Sonnet 5.5 Not Supported
OpenClaw Not Supported
OpenRouter Not Supported
Vercel AI Gateway Not Supported
Visual Studio Code Not Supported

Integrations

Claude Fable 5 Supported
Claude Fable 5.1 Supported
Claude Fable 5.5 Supported
Claude Haiku 5.5 Supported
Claude Mythos 5 Supported
Claude Mythos 5.1 Supported
Claude Opus 4.6 Supported
Claude Opus 4.7 Supported
Claude Opus 4.8 Supported
Claude Opus 5 Supported
Claude Opus 5.5 Supported
Claude Sonnet 5.5 Supported
OpenClaw Supported
OpenRouter Supported
Vercel AI Gateway Supported
Visual Studio Code Supported
Claim Beam and update features and information
Claim Beam and update features and information
Claim Trinity-Large-Thinking and update features and information
Claim Trinity-Large-Thinking and update features and information