DeepSeek V4.1 Flash

DeepSeek V4.1 Flash is the current multimodal Flash model under deepseek-flash, with a 1M context window, 384K maximum output and MIT-licensed weights.

Language ModelMultimodalCoding AgentOpen WeightsLong Context

DeepSeek API or large-scale self-hosted inference

Off-peak: $0.003/1M cache-hit input, $0.15/1M cache-miss input, $0.60/1M output; peak: $0.006, $0.30 and $1.20 respectively

Commercial

🚀Function Overview

A low-cost multimodal model for coding, reasoning, image understanding and long agent workflows through DeepSeek's API or suitably provisioned self-hosted inference.

Key Features

Current hosted model ID deepseek-flash
Legacy deepseek-v4-flash and deepseek-v4-flash-vision-exp IDs temporarily route to this model
1,000,000-token context window and 384,000-token maximum output
Text and image input with text output
Thinking and non-thinking modes with low, high and max effort behavior
JSON output, tool calls, Responses API and Anthropic-compatible Messages
552B-parameter backbone with about 8B active during input prefill and 16B during output decode
Official MIT-licensed checkpoint deepseek-ai/DeepSeek-V4.1-Flash
Off-peak pricing of $0.003 cache-hit input, $0.15 cache-miss input and $0.60 output per 1M tokens
Peak pricing of $0.006 cache-hit input, $0.30 cache-miss input and $1.20 output per 1M tokens
Account concurrency limit of 2,500 requests

Use Cases

•Cost-sensitive long-context coding and agent sessions
•Screenshot, chart and document understanding inside tool-using workflows
•Responses- or Anthropic-compatible agent integrations
•Structured JSON and function-calling applications
•Self-hosted research and inference on suitable multi-GPU or distributed hardware
•Migration from the retired V4 Flash and Vision Exp endpoints

⚙️Input Parameters

model

string

Use deepseek-flash for the current hosted DeepSeek V4.1 Flash model.

input

string | array

Text, supported image content and API input items for chat, Responses or Anthropic-compatible workflows.

reasoning

object

Optional thinking configuration for non-thinking, low, high or max behavior.

tools

array

Optional function definitions and supported tool calls.

💡Usage Examples

Example 1

Input Parameters

{
  "model": "deepseek-flash",
  "messages": [
    {
      "role": "user",
      "content": "Inspect this screenshot and list the three UI defects that block the checkout flow."
    }
  ]
}

Output Results

A text response from DeepSeek V4.1 Flash. Validate the exact image content-block format, observed model metadata, tool behavior and token use before production routing.

Quick Actions

Technical Specifications

Hardware Type: DeepSeek API or large-scale self-hosted inference
Commercial Use: Supported
Pricing: Off-peak: $0.003/1M cache-hit input, $0.15/1M cache-miss input, $0.60/1M output; peak: $0.006, $0.30 and $1.20 respectively