DeepSeek V4.1 Flash API: AI Large Language Models

Use DeepSeek V4.1 Flash through MuAPI for multimodal reasoning, image understanding, and adjustable thinking effort. DeepSeek V4.1 Flash is a multimodal reasoning model with a 1M-token context window, image understanding, and adjustable reasoning effort.

Interactive model controls

DeepSeek V4.1 Flash is a multimodal reasoning model with a 1M-token context window, image understanding, and adjustable reasoning effort.

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Overview

About this model

DeepSeek V4.1 Flash is a fast multimodal reasoning model with a 1M-token context window, native image understanding, and configurable reasoning effort.

1Multimodal image understanding and visual question answering

2Fast reasoning, coding assistance, and long-context analysis

3Agent workflows that benefit from adjustable thinking effort

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Pricing & Value

Cost analysis

Provider	Cost	Notes
muapiapp	Official DeepSeek token rates; peak/off-peak and cache-sensitive	Off-peak: $0.15/M uncached input, $0.003/M cached input, $0.60/M output. Peak rates are 2×. A $0.0001 minimum reservation is reconciled after usage.

muapiappOfficial DeepSeek token rates; peak/off-peak and cache-sensitive

Off-peak: $0.15/M uncached input, $0.003/M cached input, $0.60/M output. Peak rates are 2×. A $0.0001 minimum reservation is reconciled after usage.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

Configuration schema

Parameter	Type	Description	Default
Prompt	string	The user message or instruction for the model.	`Explain how a mixture-of-experts model works.`
Image URL	string	Optional public image URL for multimodal analysis.	`undefined`
System Prompt	string	Optional system-level instruction.	`You are a careful software engineering assistant.`
Reasoning Effort	Enum (7 options)	Thinking effort. Omit to use the model default; none and minimal disable thinking.	`-`

Promptstring

The user message or instruction for the model.

Default ValueExplain how a mixture-of-experts model works.

Image URLstring

Optional public image URL for multimodal analysis.

Default Valueundefined

System Promptstring

Optional system-level instruction.

Default ValueYou are a careful software engineering assistant.

Reasoning EffortEnum (7 options)

Thinking effort. Omit to use the model default; none and minimal disable thinking.

Default Value-

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Implementation Guide

Developer documentation

How to Use DeepSeek V4.1 Flash

Send a Prompt: Submit a POST request to /api/v1/deepseek-v4-1-flash or stream via /api/v1/deepseek-v4-1-flash/stream.
Add an Image: Optionally provide a public image_url for visual understanding.
Tune Reasoning: Set reasoning_effort to none, minimal, low, medium, high, xhigh, or max; omit it to use the model default.
Read the Result: Receive generated text or a live SSE stream.

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Common Questions

Frequently asked

Does DeepSeek V4.1 Flash support image input?

Yes. You can provide an optional public image URL alongside your prompt.

Can I control thinking effort?

Yes. Set `reasoning_effort` to one of the supported levels. `none` and `minimal` disable thinking.

Does DeepSeek V4.1 Flash support streaming?

Yes. Live streaming is available at `/api/v1/deepseek-v4-1-flash/stream`.