DeepSeek V4.1 Flash

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deepseek/deepseek-v4.1-flash
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DeepSeek V4.1 Flash is DeepSeek's latest efficiency-optimized Mixture-of-Experts model with a 1M-token context window and up to 384K output tokens. It adds native multimodal vision understanding, supports thinking mode (on by default), tool calls, JSON output and prompt caching, and per DeepSeek surpasses V4 Pro on quality, cost and speed. Served upstream under the official model id deepseek-flash.

Context Window
1M
Max Output Tokens
384K
Released
2026-09-10
Capabilities
VisionFunction CallingReasoningPrompt Caching
Available Providers
DeepSeek
Supported Protocols
openaianthropic

Providers

DeepSeek
Input Tokens
$0.3/M
Output Tokens
$1.2/M
Cache Read
$0.006/M
Protocols
openai/v1/chat/completions/v1/responses
anthropic

Code Examples

from openai import OpenAI


client = OpenAI(
    base_url="https://api.ofox.io/v1",
    api_key="YOUR_OFOX_API_KEY",
)


response = client.chat.completions.create(
    model="deepseek/deepseek-v4.1-flash",
    messages=[
        {"role": "user", "content": "Hello!"}
    ],
)


print(response.choices[0].message.content)

Related Models

More from DeepSeek

DeepSeek V4 Pro 0813
$1.32/M/$3.96/M
DeepSeek V4 Flash 0731
$0.44/M/$1.32/M
DeepSeek V4 Flash 0423
$0.44/M/$1.32/M

Similar Models

OpenAI: GPT-6 Astra
$10/M/$50/M
Google: Gemini 3.8 Flash
$1.5/M/$7.5/M
Qwen: Qwen3.8 Max 0902
$2/M/$6/M

Frequently Asked Questions

DeepSeek V4.1 Flash on Ofox.ai costs $0.3/M per million input tokens and $1.2/M per million output tokens. Pay-as-you-go, no monthly fees.