Arcee AI: Trinity Large Thinking — AI Model

What is Arcee AI: Trinity Large Thinking?

Arcee AI Trinity Large Thinking is a powerful open-source reasoning model available free on OpenRouter. With a 262K context window, it is optimized for agentic workflows and performs well on PinchBench and reasoning benchmarks. Best results come from preserving interleaved thinking (chain-of-thought) tokens. Model weights are open on Hugging Face. Text-only. OpenAI-compatible via OpenRouter. Free tier: 200 RPD (or 1,000 with $10 lifetime credit).

Arcee AI: Trinity Large Thinking API Code Example

Paste your API key and run. See the config generator for Claude Code, Cursor, and more tools.

from openai import OpenAI

client = OpenAI(
    base_url="https://openrouter.ai/api/v1",
    api_key="YOUR_API_KEY"
)

response = client.chat.completions.create(
    model="arcee-ai/trinity-large-thinking",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const openai = new OpenAI({
  baseURL: "https://openrouter.ai/api/v1",
  apiKey: "YOUR_API_KEY",
});

const completion = await openai.chat.completions.create({
  model: "arcee-ai/trinity-large-thinking",
  messages: [{ role: "user", content: "Hello!" }],
});

console.log(completion.choices[0].message.content);

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "arcee-ai/trinity-large-thinking",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

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