Base URL

API ??

https://modelrelayapis.cc/v1

Available Models

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• deepseek-v4-flash ? Fast, affordable (Trial / Starter / Standard / Pro)?????Trial / Starter / Standard / Pro ????
• deepseek-v4-pro ? Higher quality (Pro plan only)?????? Pro ???

Setup Steps

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1. Install the LangChain OpenAI package: pip install langchain-openai
2. Configure ChatOpenAI with our gateway as shown in the Python example below.
3. Set base_url to https://modelrelayapis.cc/v1.
4. Set api_key to your sk-gateway API Key.
5. Set model to deepseek-v4-flash.

1. ?? LangChain OpenAI ??pip install langchain-openai
2. ??? Python ???? ChatOpenAI?
3. base_url ?? https://modelrelayapis.cc/v1
4. api_key ?? sk-gateway API Key?
5. model ?? deepseek-v4-flash?

Python Example (LangChain)

Python ?? (LangChain)

from langchain_openai import ChatOpenAI

llm = ChatOpenAI(
    base_url="https://modelrelayapis.cc/v1",
    api_key="sk-gateway-YOUR-KEY",
    model="deepseek-v4-flash"
)

response = llm.invoke("Explain quantum computing in one sentence.")
print(response.content)

Quick curl Test

curl ????

curl https://modelrelayapis.cc/v1/chat/completions   -H "Content-Type: application/json"   -H "Authorization: Bearer sk-gateway-YOUR-KEY"   -d '{"model":"deepseek-v4-flash","messages":[{"role":"user","content":"Hello"}]}'

Common Errors

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