Trinity Large Thinking
Arcee AIReleased Apr 1, 2026
Trinity Large Thinking is a powerful open source reasoning model from the team at Arcee AI. It shows strong performance in PinchBench, agentic workloads, and reasoning tasks. Launch video: https://youtu.be/Gc82AXLa0Rg?si=4RLn6WBz33qT--B7...
- Context window
- 262K tokens
- Max output
- 80K tokens
- Input
- text
- Output
- text
- Tokenizer
- Other
- Released
- Apr 1, 2026
- Reasoning
- always on
Pricing
Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.
| Per 1M tokens | Provider | + 3% fee | You pay |
|---|---|---|---|
| Input | $0.250 | $0.0075 | $0.258 |
| Output | $0.800 | $0.024 | $0.824 |
| Cache read | $0.060 | $0.0018 | $0.062 |
Benchmarks
Design Arena
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| 3Dmodels | 1158 | 41.3% | #59 |
| ASCII artmodels | 1087 | 37.1% | #45 |
| Codemodels | 1165 | 40.1% | #62 |
| Data vizmodels | 1142 | 39.3% | #69 |
| Game devmodels | 1142 | 38.1% | #68 |
| SVGmodels | 1073 | 35.2% | #59 |
| UI componentsmodels | 1100 | 32.5% | #73 |
| Websitesmodels | 1177 | 41.3% | #60 |
Head-to-head preference voting. How we filter and rank
Supported parameters
- include_reasoning
- max_tokens
- reasoning
- temperature
- tool_choice
- tools
- top_k
- top_p
Call it
OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model arcee-ai/trinity-large-thinking.
curl https://api.openkey.ai/v1/chat/completions \
-H "Authorization: Bearer $OPENKEY_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "arcee-ai/trinity-large-thinking",
"messages": [{"role": "user", "content": "Hello"}]
}'import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.openkey.ai/v1",
api_key=os.environ["OPENKEY_API_KEY"],
)
completion = client.chat.completions.create(
model="arcee-ai/trinity-large-thinking",
messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.openkey.ai/v1",
apiKey: process.env.OPENKEY_API_KEY,
});
const completion = await client.chat.completions.create({
model: "arcee-ai/trinity-large-thinking",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);Questions
- How much does Trinity Large Thinking cost via API?
- Through OpenKey, Trinity Large Thinking costs $0.258 per 1M input tokens and $0.824 per 1M output tokens. That is the provider price ($0.250 / $0.800) plus a flat 3% fee — nothing else.
- What is Trinity Large Thinking's context window?
- Trinity Large Thinking accepts up to 262K tokens of context and returns up to 80K tokens per request.
- Is Trinity Large Thinking OpenAI-compatible?
- Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "arcee-ai/trinity-large-thinking" using any OpenAI SDK — only the base URL and API key change.
- What inputs does Trinity Large Thinking support?
- Trinity Large Thinking accepts text input and produces text output.
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