Arcee AI Trinity Large Thinking Is Now Available in Puter.js

Puter.js now supports Trinity Large Thinking, Arcee AI's reasoning-optimized model that ranks #2 on PinchBench behind only Claude Opus 4.6—at roughly 96% lower cost.

What is Trinity Large Thinking?

Trinity Large Thinking is a reasoning-optimized open-source model from Arcee AI, built on a 398B-parameter sparse Mixture-of-Experts architecture with approximately 13B active parameters per token. Key features include:

• Extended Chain-of-Thought Reasoning: Uses explicit thinking traces before generating responses for more accurate, well-reasoned outputs
• 262K Context Window: Supports up to 262K tokens of input with up to 80K output tokens
• Top Agentic Performance: Scores 94.7% on τ²-Bench and 91.9% on PinchBench, ranking #2 overall behind only Claude Opus 4.6
• Purpose-Built for Agents: Designed for multi-turn tool calling, long-horizon planning, and stable behavior across extended agent loops

Examples

Complex reasoning with thinking traces

const response = await puter.ai.chat(
  "Prove that the square root of 2 is irrational",
  { model: 'arcee-ai/trinity-large-thinking', stream: true }
);

for await (const part of response) {
  if (part?.reasoning) puter.print(part?.reasoning);
  else puter.print(part?.text);
}

Agentic tool use

puter.ai.chat("Find the current weather in Tokyo and convert the temperature from Celsius to Fahrenheit",
  { model: 'arcee-ai/trinity-large-thinking' }
);

Code generation with reasoning

puter.ai.chat("Implement a B-tree in Python with insert, delete, and search operations. Explain your design choices.",
  { model: 'arcee-ai/trinity-large-thinking' }
);

Multi-step analysis

puter.ai.chat("Compare the CAP theorem trade-offs of Cassandra, MongoDB, and CockroachDB for a global e-commerce platform",
  { model: 'arcee-ai/trinity-large-thinking' }
);

Get Started Now

Just add one library to your project:

// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';

Or add one script tag to your HTML:

<script src="https://js.puter.com/v2/"></script>

No API keys needed. Start building with Trinity Large Thinking immediately.

Learn more:

• Free, Unlimited Arcee AI API
• Puter.js AI Documentation