Ship AI that reasons —
not just responds.

from vantafold import Vantafold

client = Vantafold()

stream = client.reason.stream(
    model="auto",
    input=[{"role": "user", "content": "Summarize this contract."}],
    routing={"optimize": "quality", "fallback": ["frontier-lg", "oss-70b"]},
)

for event in stream:
    if event.type == "output_text.delta":
        print(event.delta, end="")

import { Vantafold } from "@vantafold/sdk";

const client = new Vantafold({ apiKey: process.env.VANTAFOLD_API_KEY });

const stream = await client.reason.stream({
  model: "auto",
  input: [{ role: "user", content: "Summarize this contract." }],
  routing: { optimize: "quality", fallback: ["frontier-lg", "oss-70b"] },
});

for await (const event of stream) {
  if (event.type === "output_text.delta") process.stdout.write(event.delta);
}

curl https://api.vantafold.ai/v1/reason \
  -H "Authorization: Bearer $VANTAFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "auto",
    "input": "Summarize this contract.",
    "routing": { "optimize": "quality" },
    "stream": true
  }'