DeepSeek Chat (V4.1 Flash) API

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.

Modalities: TextText
In / Out price: $0.3/$1.2per 1M
Context window: 1.05M tokens
Released: Sep 10, 2026

DeepSeek Chat (V4.1 Flash) overview

DeepSeek Chat (V4.1 Flash) specs

Model ID: deepseek/deepseek-chat
Developer: DeepSeek
Context window: 1,048,576 tokens
Max output: 384,000 tokens
Input: Text
Output: Text
API: OpenAI-compatible, base URL https://api.aimlapi.com/v1

What Is DeepSeek Chat (V4.1 Flash) API?

DeepSeek Chat is the legacy model name deepseek-chat, which was documented as routing to DeepSeek V4 Flash in non-thinking mode.

DeepSeek’s official API notes that the latest V4.1 Flash model is available with native multimodal support, and the model name to use is deepseek-flash.

Technical Reference

Developer	DeepSeek
Model ID	deepseek/deepseek-chat
Release Date	September 10, 2026
Context Window	1,048,576 tokens (~1.0M)
Max Output Tokens	384,000 tokens
Modalities	Text → Text
Capabilities	file input, parallel tool calls, streaming, structured (JSON schema) output, tool/function calling

What DeepSeek Chat (V4.1 Flash) Brings to the Table

Legacy alias
deepseek-chat was described as the non-thinking route for DeepSeek V4 Flash.

Current API name
DeepSeek’s API documentation says to set the model to deepseek-flash for the latest V4.1 Flash model.

Native multimodal support
DeepSeek says V4.1 Flash is available with native multimodal support.

General capability focus
A model listing describes V4.1 Flash as suited for efficient general, reasoning, coding, and agent workloads, with native image input.

Where DeepSeek Chat (V4.1 Flash) Makes the Most Sense

General chat
The model is presented as a chat assistant route for non-thinking responses.

Image input workflows
DeepSeek’s V4.1 Flash documentation says the model has native multimodal support, and one listing specifically mentions native image input.

Coding and reasoning
A model directory describes it as suitable for reasoning, coding, and agent workloads.

DeepSeek Chat (V4.1 Flash) vs the Alternatives

DeepSeek-V4.1-Flash
DeepSeek’s official API documentation names deepseek-flash as the current V4.1 Flash model.

DeepSeek-V4-Flash
A migration guide states deepseek-chat mapped to DeepSeek-V4-Flash in non-thinking mode before retirement of the legacy name.

Sources: https://seek-chat.com/models/ · https://deep-seek.com/chat · https://deepseek.chat/chat

Use cases

DeepSeek Chat (V4.1 Flash) is documented as suitable for multimodal use cases, because it natively processes images and text and includes native multimodal support.

It is also documented for chat and conversational workflows, since the model is described as returning responses to a list of conversation messages and supporting longer chat-like conversations.

Another documented use case is image-text tasks such as image-to-text-to-text pipelines, which are explicitly shown in the model report and aligned with its native image-and-text processing.

It is further described as well suited to agentic and tool-calling workflows, with documentation noting support for tools and examples naming agent frameworks and tool-based pipelines.

Capabilities

File input
Streaming
Structured outputs
Function calling

DeepSeek Chat (V4.1 Flash) benchmarks by Artificial Analysis

See how DeepSeek Chat (V4.1 Flash) compares in generation speed and latency. Data retrieved Nov 3, 2026.

Speed#13 / 219264Output tokens / second Latency#44 / 2160.88Seconds to first token Humanity's Last Exam#207 / 45810.8%Score Terminal-Bench 4.0#55 / 1545.6%Score

Speed

Output tokens / second

Benchmark results

Compare 5 models available on AI/ML API across 4 independent benchmarks.

Humanity's Last Exam

Expert-written questions across academic subjects.

DeepSeek Chat (V4.1 Flash) API pricing

DeepSeek Chat (V4.1 Flash) pricing in US dollars
Usage	Price	Unit
Input	$0.3	1M tokens
Output	$1.2	1M tokens
Cached input	$0.006	1M tokens

Prices from the AI/ML API price list, checked on Nov 4, 2026.

DeepSeek Chat (V4.1 Flash) vs other models: token prices

AI/ML API input and output rates for 5 models, per million tokens.

AI/ML API model prices in USD per million tokens
Model	Input	Output
DeepSeek Chat (V4.1 Flash)	$0.3	$1.2
DeepSeek V4.1 Flash	$0.3	$1.2
DeepSeek V4 Flash Vision Exp	$0.44	$1.32
DeepSeek V4.1 Flash 1017	$0.39	$1.56
DeepSeek V4 Pro 0813	$1.84	$3.68

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

View docs

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key

export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"

2Make your first request

curl '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": "Write a haiku about the ocean."
    }
  ]
}'

import os
import requests

headers = {
    "Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
    "Content-Type": "application/json",
}
payload = {
    "model": "deepseek/deepseek-chat",
    "messages": [
        {
            "role": "user",
            "content": "Write a haiku about the ocean."
        }
    ]
}

response = requests.post("https://api.aimlapi.com/v1/chat/completions", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())

const response = 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": "Write a haiku about the ocean."
      }
    ]
  }),
});

if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());

DeepSeek Chat (V4.1 Flash) FAQ

What is the context window of DeepSeek Chat (V4.1 Flash)?

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

What inputs and outputs does DeepSeek Chat (V4.1 Flash) support?

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

What is the model ID for DeepSeek Chat (V4.1 Flash)?

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

When was DeepSeek Chat (V4.1 Flash) released?

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

How much does DeepSeek Chat (V4.1 Flash) cost?

DeepSeek Chat (V4.1 Flash) costs $0.3 input and $1.2 output per 1M tokens on AI/ML API, billed as you go with no subscription.

Does DeepSeek Chat (V4.1 Flash) support streaming?

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

Who created DeepSeek Chat (V4.1 Flash)?

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

Is DeepSeek Chat (V4.1 Flash) free to use?

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

How do I call DeepSeek Chat (V4.1 Flash) through the API?

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

Start building with DeepSeek Chat (V4.1 Flash)

Get API key

DeepSeek Chat (V4.1 Flash) API

deepseek/deepseek-chat

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key

export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"

2Make your first request

curl '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": "Write a haiku about the ocean."
    }
  ]
}'

import os
import requests

headers = {
    "Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
    "Content-Type": "application/json",
}
payload = {
    "model": "deepseek/deepseek-chat",
    "messages": [
        {
            "role": "user",
            "content": "Write a haiku about the ocean."
        }
    ]
}

response = requests.post("https://api.aimlapi.com/v1/chat/completions", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())

const response = 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": "Write a haiku about the ocean."
      }
    ]
  }),
});

if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());

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DeepSeek Chat (V4.1 Flash) API

DeepSeek Chat (V4.1 Flash) overview

DeepSeek Chat (V4.1 Flash) specs

What Is DeepSeek Chat (V4.1 Flash) API?

Technical Reference

What DeepSeek Chat (V4.1 Flash) Brings to the Table

Where DeepSeek Chat (V4.1 Flash) Makes the Most Sense

DeepSeek Chat (V4.1 Flash) vs the Alternatives

Use cases

Capabilities

DeepSeek Chat (V4.1 Flash) benchmarks by Artificial Analysis

Speed

Benchmark results

Humanity's Last Exam

Terminal-Bench 4.0

AA-LCR

SciCode

DeepSeek Chat (V4.1 Flash) API pricing

DeepSeek Chat (V4.1 Flash) vs other models: token prices

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

Build with your agent

1Get your API key

2Make your first request

DeepSeek Chat (V4.1 Flash) FAQ

Start building with DeepSeek Chat (V4.1 Flash)

DeepSeek Chat (V4.1 Flash) API

Build with your agent

1Get your API key

2Make your first request

DeepSeek Chat (V4.1 Flash) API

DeepSeek Chat (V4.1 Flash) overview

DeepSeek Chat (V4.1 Flash) specs

What Is DeepSeek Chat (V4.1 Flash) API?

Technical Reference

What DeepSeek Chat (V4.1 Flash) Brings to the Table

Where DeepSeek Chat (V4.1 Flash) Makes the Most Sense

DeepSeek Chat (V4.1 Flash) vs the Alternatives

Use cases

Capabilities

Speed

Benchmark results

Humanity's Last Exam

Terminal-Bench 4.0

AA-LCR

SciCode

DeepSeek Chat (V4.1 Flash) API pricing

DeepSeek Chat (V4.1 Flash) vs other models: token prices

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

Build with your agent

1Get your API key

2Make your first request

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DeepSeek Chat (V4.1 Flash) FAQ

Start building with DeepSeek Chat (V4.1 Flash)