AI Rate Card

Step3 · aihubmix

Step3 is a multimodal reasoning model released by StepFun. It uses a Mixture‑of‑Experts (MoE) architecture with 321 billion total parameters and 38 billion activation parameters. The model follows an end‑to‑end design that reduces decoding cost while delivering top‑tier performance on vision‑language reasoning tasks. Thanks to the combined use of Multi‑Head Factorized Attention (MFA) and Attention‑FFN Decoupling (AFD), Step3 remains highly efficient on both flagship and low‑end accelerators. During pre‑training, it processed over 20 trillion text tokens and 4 trillion image‑text mixed tokens, covering more than ten languages. On benchmarks for mathematics, code, and multimodal tasks, Step3 consistently outperforms other open‑source models.

BasismodellAlle Modelle dieser BasisAlle Modelle des Anbieterszum Anbieter

Alle StepFun-Modelle bei allen Anbietern

Eingabe, $/1M $1.10

Ausgabe, $/1M $2.75

Kontext —

Akzeptiert —

Zuletzt geprüft 04.11.2026 12:00:14 UTC

Quelle Seite des Anbieters

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API

OpenAI-kompatible API: Die offiziellen OpenAI-SDKs funktionieren mit dieser Basis-URL. Ersetzen Sie YOUR_API_KEY durch Ihren Schlüssel vom Anbieter.

API-Basis-URL
https://aihubmix.com/api/v1
Endpunkt
https://aihubmix.com/api/v1/chat/completions
Modell-ID
stepfun-ai/step3
curl
curl https://aihubmix.com/api/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "stepfun-ai/step3", "messages": [{"role": "user", "content": "Hello!"}], "max_tokens": 256}'
Python
import requests

r = requests.post(
    "https://aihubmix.com/api/v1/chat/completions",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
      "model": "stepfun-ai/step3",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ],
      "max_tokens": 256
    },
)
print(r.json())
JavaScript
const r = await fetch("https://aihubmix.com/api/v1/chat/completions", {
  method: "POST",
  headers: {Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
  body: JSON.stringify({
    "model": "stepfun-ai/step3",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ],
    "max_tokens": 256
  }),
});
console.log(await r.json());
Anfrage (JSON)
{
  "model": "stepfun-ai/step3",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "max_tokens": 256
}
Antwort (JSON)
{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "model": "stepfun-ai/step3",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hi! How can I help?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 12,
    "total_tokens": 21
  }
}

Die Adresse stammt aus der Modellliste des Anbieters; bitte mit seiner Dokumentation abgleichen.

API-Dokumentation des Anbieters

Source: AI Rate Card, https://airatecard.com/de/c/offer%3Aaihubmix%7Cstepfun-ai/step3, prices checked 2026-11-04; seller's page: https://aihubmix.com

Technische Details

ID: offer:aihubmix|stepfun-ai/step3