DeepSeek V4.1 Flash API

DeepSeek V4.1 Flash pricing

Prices are USD per million tokens. Cached input uses the cache-read rate when a cache hit is reported.

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API compatibility and context

Exact model ID

deepseek-v4.1-flash

Variant

standard

Supported API

OpenAI-compatible Chat Completions

Availability

preview

Context window

Not published

Maximum input

Not published

Maximum output

Not published

Use DeepSeek V4.1 Flash through the API

Create a RouterHub account, add prepaid credits and create an API key. Set ROUTERHUB_API_KEY locally, then send a first request with the exact model ID below.

cURL

curl --connect-timeout 30 --max-time 600 https://routerhub.si/v1/chat/completions \
  -H "Authorization: Bearer $ROUTERHUB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"deepseek-v4.1-flash","messages":[{"role":"user","content":"Write a short noir scene set in a lighthouse."}],"max_tokens":256}'

Python

Install openai with pip. The examples request 256 output tokens and disable automatic retries. Check Usage after completion or a timeout before resending a paid request.

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["ROUTERHUB_API_KEY"],
    base_url="https://routerhub.si/v1",
    timeout=600.0,
    max_retries=0,
)
response = client.chat.completions.create(
    model="deepseek-v4.1-flash",
    messages=[{"role": "user", "content": "Write a short noir scene set in a lighthouse."}],
    max_tokens=256,
)
print(response.choices[0].message.content)

• Find compatible tools for this modelChoose a coding tool and configure your model.
• Get API accessCreate an account and set up your API key.

DeepSeek V4.1 Flash FAQ

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