K2 Horizon
Free right now
Small
New
Long context
K2 Horizon is a language model. It is currently free at 1 provider with up to 524K tokens of context.
- Context
- 524K tokens
- Type
- Text
- Free since
- September 23, 2026
Where to use K2 Horizon for free
Each row is a separate free endpoint with its own limits.
Quick start
curl https://api.unorouter.com/v1/chat/completions \
-H "Authorization: Bearer $UNOROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "k2-horizon:free",
"messages": [{"role": "user", "content": "Hello!"}]
}'from openai import OpenAI
client = OpenAI(
base_url="https://api.unorouter.com/v1",
api_key="YOUR_UNOROUTER_API_KEY",
)
reply = client.chat.completions.create(
model="k2-horizon:free",
messages=[{"role": "user", "content": "Hello!"}],
)
print(reply.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.unorouter.com/v1",
apiKey: process.env.UNOROUTER_API_KEY,
});
const reply = await client.chat.completions.create({
model: "k2-horizon:free",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(reply.choices[0].message.content);Example for UnoRouter. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.
Benchmarks
This model is not on the Artificial Analysis leaderboard yet. We do not publish our own estimates.
Similar free models
FAQ
Is K2 Horizon free?
Yes. As of September 26, 2026, K2 Horizon is free at UnoRouter. Each provider has its own limits — see the table above.
What is the context window of K2 Horizon?
The largest context among free routes is 524,288 tokens. Some providers cap it lower.
How do I call K2 Horizon via API?
Use any OpenAI-compatible client with base URL https://api.unorouter.com/v1, model ID k2-horizon:free, and a UnoRouter key.