---
title: DeepSeek: DeepSeek V4.1 Flash | Text Generation | ModelsLab
description: Build with DeepSeek: DeepSeek V4.1 Flash API by DeepSeek. Text generation, chat, code, and reasoning. Plans from $21/month.
url: https://modelslab.com/models/deepseek/deepseek-deepseek-v4.1-flash.md
canonical: https://modelslab.com/models/deepseek/deepseek-deepseek-v4.1-flash
type: product
component: Playground/LLM/Index
generated_at: 2026-09-20T18:24:05.547325Z
---

DeepSeek: DeepSeek V4.1 Flash
---

 [LLMs.txt](https://modelslab.com/models/deepseek/deepseek-deepseek-v4.1-flash/llms.txt) [.md](https://modelslab.com/models/deepseek/deepseek-deepseek-v4.1-flash.md)

DeepSeek: DeepSeek V4.1 Flash
---

Choose a prompt below to get started or type your own message

 Explain quantum computing in simple terms

 Write a Python function to sort a list

 Create a marketing email for a SaaS product

 Compare REST vs GraphQL APIs

images and text files

Send

### DeepSeek: DeepSeek V4.1 Flash

deepseek deepseek-deepseek-v4.1-flash

Copy model ID

PricingInput $0.15 / 1M tokens

Output $0.60 / 1M tokens

API EndpointsOpenAI Compatible

`https://modelslab.com/api/v7/llm/chat/completions`Endpoint

Anthropic Compatible

`https://modelslab.com/api/v7/llm/v1/messages`Messages

`https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens

`https://modelslab.com/api/v7/llm/v1/models`Models

Use with Claude Code

cURL Example

ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses.

Temperature0.7

Max Tokens4000

Top P0.9

Frequency Penalty0

Presence Penalty0

Thinkinglow

lowmediumhigh

Deeper thinking spends more of the Max Tokens budget before the answer starts.

Model Info

Support

Looking for something different?
---

Models that trade off differently against the one you are viewing

### Better quality

Newer flagship models that generally produce stronger results.

[![GPT 5.2](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/2bdd00f4-1692-49d8-a562-72cb1753d0ff.png)](https://modelslab.com/models/openai/gpt-5.2)[OpenAI](https://modelslab.com/models/openai)

 [GPT 5.2](https://modelslab.com/models/openai/gpt-5.2)

[![GPT 5.1](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/fad83520-47a8-4059-b4b9-b32adf4d0be7.png)](https://modelslab.com/models/openai/gpt5.1)[OpenAI](https://modelslab.com/models/openai)

 [GPT 5.1](https://modelslab.com/models/openai/gpt5.1)

[![Gemini 3 Pro Preview](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/1846e76f-9d5c-4a35-a43a-82db45b7bb8b.png)](https://modelslab.com/models/google/gemini-3-pro-preview)[Google](https://modelslab.com/models/google)

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[![GPT-5.1-Codex-Max](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/06356c4c-df09-4ccb-a5c0-629da670f75b.png)](https://modelslab.com/models/openai/gpt-5.1-codex-max)[OpenAI](https://modelslab.com/models/openai)

 [GPT-5.1-Codex-Max](https://modelslab.com/models/openai/gpt-5.1-codex-max)

### Lower cost per run

Open-source models we host, unlimited on the $149/month plan.

[Modelslab: Custom LLM

Popular](https://modelslab.com/models/modelslab/uncensored-chat)[ModelsLab](https://modelslab.com/models/modelslab)

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Open Source Model](https://modelslab.com/models/modelslab/uncensored-chat)

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Closed Source Model](https://modelslab.com/models/qwen/qwen-qwen3-235b-a22b-2507)

[![gpt-oss-20b](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/8b2f0440-52cc-4f41-93eb-d31006ad71e2.webp)](https://modelslab.com/models/openai/gpt-oss-20b)[OpenAI](https://modelslab.com/models/openai)

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Closed Source Model](https://modelslab.com/models/openai/gpt-oss-20b)

[![DeepSeek: DeepSeek V4 Flash 0423](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/267a7228-f392-4d3e-abb6-915fef640c49.png)](https://modelslab.com/models/deepseek/deepseek-deepseek-v4-flash)[DeepSeek](https://modelslab.com/models/open_router)

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Closed Source Model](https://modelslab.com/models/deepseek/deepseek-deepseek-v4-flash)

[Qwen: Qwen3.5-9B](https://modelslab.com/models/qwen/qwen-qwen3.5-9b)[Qwen](https://modelslab.com/models/open_router)

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Closed Source Model](https://modelslab.com/models/qwen/qwen-qwen3.5-9b)

[![Qwen3.5 9B FP8](https://images.modelslab.sh/?Image=https://assets.modelslab.ai/generations/475e7d51-3e69-4cbc-adb0-64e01535ac29.png)](https://modelslab.com/models/Qwen/Qwen-Qwen3.5-9B)[Qwen](https://modelslab.com/models/open_router)

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Closed Source Model](https://modelslab.com/models/Qwen/Qwen-Qwen3.5-9B)

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About DeepSeek: DeepSeek V4.1 Flash
---

DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture. It activates 8B parameters on input and 16B on...

### Technical Specifications

Model IDdeepseek-deepseek-v4.1-flash

CategoryLLM Models

TaskText Generation

Price$0.375 per million tokens

AddedSeptember 10, 2026

### Key Features

- Chat completion and multi-turn conversation API
- Streaming response with token-by-token output
- Function calling and tool use support
- System prompts and role-based messaging
- JSON mode and structured output

### Quick Start

Integrate DeepSeek: DeepSeek V4.1 Flash into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started.

PythonJavaScriptcURLPHP

```
<code>import requests
import json

url = "https://modelslab.com/api/v7/llm/chat/completions"

headers = {
    "Content-Type": "application/json"
}

data = {
        "model_id": "deepseek-deepseek-v4.1-flash",
        "messages": [
            {
                "role": "user",
                "content": "Hello!"
            }
        ],
        "max_tokens": 1000,
        "key": "YOUR_API_KEY"
    }

try:
    response = requests.post(url, headers=headers, json=data)
    response.raise_for_status()  # Raises an HTTPError for bad responses (4XX or 5XX)
    result = response.json()
    print("API Response:")
    print(json.dumps(result, indent=2))
except requests.exceptions.HTTPError as http_err:
    print(f"HTTP error occurred: {http_err} - {response.text}")
except Exception as err:
    print(f"Other error occurred: {err}")</code>
```

### Pricing

DeepSeek: DeepSeek V4.1 Flash API costs $0.375 per million tokens. Plans start at $21/month, and open-source models are unlimited on the $149/month plan. [View pricing plans](https://modelslab.com/pricing)

### Use Cases

- AI chatbots and virtual assistants
- Code generation and developer tools
- Content writing and copywriting automation
- Data analysis, summarization, and extraction

[Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from DeepSeek](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing)

DeepSeek: DeepSeek V4.1 Flash FAQ
---

### What is DeepSeek: DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture. It activates 8B parameters on input and 16B on...

### How do I use the DeepSeek: DeepSeek V4.1 Flash API?

You can integrate DeepSeek: DeepSeek V4.1 Flash into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "deepseek-deepseek-v4.1-flash" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### How much does DeepSeek: DeepSeek V4.1 Flash cost?

DeepSeek: DeepSeek V4.1 Flash costs $0.375 per million tokens. ModelsLab plans start at $21/month (Basic), and the $149/month Open Source plan includes unlimited generation on open-source models.

### What is the DeepSeek: DeepSeek V4.1 Flash model ID?

The model ID for DeepSeek: DeepSeek V4.1 Flash is "deepseek-deepseek-v4.1-flash". Use this ID in your API requests to specify this model.

### Do I need a paid plan to use DeepSeek: DeepSeek V4.1 Flash?

Yes. ModelsLab is subscription-based with no free tier — plans start at $21/month (Basic, 3,250 API calls). The $149/month Open Source Unlimited plan includes unlimited generation across open-source models; premium third-party models are billed per call from your wallet.

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*This markdown version is optimized for AI agents and LLMs.*

**Links:**
- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
- [Blog](https://modelslab.com/blog)

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*Generated by ModelsLab - 2026-09-20*