DeepSeek Chat (V4.1 Flash) API

deepseek/deepseek-chat
DeepSeek Chat (V4.1 Flash) is DeepSeek’s multimodal Flash model for fast, high-throughput general chat, coding, and agentic tasks, with native image understanding.
Context
1.0M tokens
Input
$0.39 / 1M tokens
Output
$1.56 / 1M tokens
Released
Sep 10, 2026

How to use DeepSeek Chat (V4.1 Flash) API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to deepseek/deepseek-chat.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "deepseek/deepseek-chat",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "deepseek/deepseek-chat",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"deepseek/deepseek-chat","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

DeepSeek Chat (V4.1 Flash) API Pricing

TypePrice
Input
$0.39 / 1M tokens
Output
$1.56 / 1M tokens
Cached input
$0.0078 / 1M tokens

DeepSeek Chat (V4.1 Flash) vs other models

ModelInputOutputContextBest for
$0.39 / 1M tokens
$1.56 / 1M tokens
1.0M tokens
Agentic workflows and structured output
$0.39 / 1M tokens
$1.56 / 1M tokens
1M tokens
Reasoning + agents
$2.393196 / 1M tokens
$4.786392 / 1M tokens
1.0M tokens
Agentic workflows and structured output
$0.572 / 1M tokens
$1.716 / 1M tokens
1M tokens
Vision + long-context reasoning

Frequently asked questions

DeepSeek Chat (V4.1 Flash) has a 1,048,576 tokens context window and can return up to 384,000 tokens.

DeepSeek Chat (V4.1 Flash) takes text as input and returns text.

Use deepseek/deepseek-chat as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

DeepSeek Chat (V4.1 Flash) became available on September 10, 2026.

DeepSeek Chat (V4.1 Flash) is priced at input $0.39 / 1M tokens, output $1.56 / 1M tokens, cached input $0.0078 / 1M tokens.

Yes, DeepSeek Chat (V4.1 Flash) can stream responses as they are generated.

DeepSeek Chat (V4.1 Flash) was built by DeepSeek.

No, it is a paid model billed per token, with separate input and output rates.

Send requests to https://api.aimlapi.com/v1/chat/completions using the model id deepseek/deepseek-chat.

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