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Step 3.7 Flash

Latency-optimised assistant model that thinks briefly before answering — a good fit for interactive products.

stepfun-ai/step-3.7-flash
Running· verified just now · 3288ms

What is Step 3.7 Flash?

Step 3.7 Flash is StepFun's chat model. Latency-optimised assistant model that thinks briefly before answering — a good fit for interactive products. It runs on Speka's OpenAI-compatible /v1/chat/completions endpoint at $0.25 / 1M input and $0.75 / 1M output tokens, using the model ID stepfun-ai/step-3.7-flash.

Test it live

Live playgroundStep 3.7 Flashin-browser demo

Test Step 3.7 Flash live

Send a message and watch the model respond. Multi-turn — it remembers the conversation.

How to call Step 3.7 Flash via the API

Speka exposes Step 3.7 Flash on an OpenAI-compatible /v1/chat/completions endpoint. Point any OpenAI SDK at https://speka.me/v1, set model to stepfun-ai/step-3.7-flash, and your existing code runs unchanged.

quickstart.py
from openai import OpenAI

client = OpenAI(
    base_url="https://speka.me/v1",
    api_key="sk-speka-live-...",  # your Speka key
)

resp = client.chat.completions.create(
    model="stepfun-ai/step-3.7-flash",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)
FAQ

Frequently asked questions

Step 3.7 Flash is StepFun's chat model. Latency-optimised assistant model that thinks briefly before answering — a good fit for interactive products. It is available on Speka's OpenAI-compatible API using the model ID stepfun-ai/step-3.7-flash.
On Speka, Step 3.7 Flash is priced at $0.25 / 1M input and $0.75 / 1M output tokens. Pricing is per-token with no subscription or seat fee — usage is billed against your plan's monthly allowance, then at the same rate with no overage penalty. Rates are current as of June 2026; check the pricing page for updates.
Speka exposes Step 3.7 Flash on an OpenAI-compatible /v1/chat/completions endpoint. Set base_url to https://speka.me/v1, supply your Speka key, and set model to "stepfun-ai/step-3.7-flash" in any OpenAI SDK — no other code changes are required.
Step 3.7 Flash supports a 128,000-token context window — roughly 96,000 words of input, suitable for long documents, multi-turn agents, and large-context tasks.
Yes. Step 3.7 Flash is served through Speka's OpenAI-compatible endpoint, so any application built on the OpenAI Python or Node.js SDK, LangChain, or LlamaIndex can call it by changing only the base URL and model ID.

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