DeepSeek V4 Pro
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DeepSeek V4 Pro · Smart Chat, Zero Setup

Talk to DeepSeek-V4 Online — Faster Answers, Deeper Reasoning

One click to open the web chat. Handle long documents, code, images, and daily questions with DeepSeek-V4-Pro or Flash — no download, no friction.

Start Chatting Now See What V4 Can Do

Why Teams Choose V4

Six capabilities that make DeepSeek-V4 a practical daily assistant — not just a benchmark headline.

1M

Read Everything at Once

Drop in contracts, repos, or research packs — the model keeps the full picture in view.

2×

Pro & Flash Editions

Flagship depth when you need it; lightweight speed when you don't.

KB

Strong World Knowledge

Reliable answers on facts, concepts, and cross-domain questions.

AI

Agent-Ready by Default

Plan multi-step tasks, call tools, and ship code with less back-and-forth.

IMG

See What You Share

Upload screenshots, charts, or photos and ask follow-up questions in the same thread.

CoT

Think Before It Replies

Chain-of-thought reasoning helps with math, analysis, and tricky instructions.

No Install · Ready in Seconds

Open DeepSeek-V4 in Your Browser

Long context, sharp reasoning, and Agent skills — pick Pro or Flash and start talking.

1M Tokens Pro / Flash Vision & Tools
Launch MidassAI Chat

Pro or Flash — Pick Your Fit

Same million-token window, different speed and cost profiles. Match the edition to your task.

Max Power

DeepSeek-V4-Pro

  • 1.6T total · 49B active parameters
  • 1M-token context on every request
  • Best for hard reasoning, agents, and long-document work
  • CoT, JSON mode, and tool calling out of the box
Fast Lane

DeepSeek-V4-Flash

  • 284B total · 13B active parameters
  • Same 1M context, lower latency
  • Ideal for chat, drafts, and high-volume simple tasks
  • Strong quality on everyday prompts at lower cost

Long Context, Less Friction

V4 keeps ultra-long inputs practical — fewer chunks, fewer copy-paste loops, more coherent answers.

27%

Less compute than V3.2 at 1M context (Pro)

10%

Less VRAM than V3.2 at 1M context (Pro)

1M

Token window across official services

What 1M tokens feels like

Roughly 750,000 Chinese characters — enough for a full novel trilogy plus notes, or an entire mid-size codebase.

Built for Agent Workflows

From coding assistants to ops automation — V4 is tuned for plans, tools, and multi-step execution.

Code in Context

Understand project structure and iterate across files without losing the thread.

Docs from Raw Material

Turn specs, logs, and meeting notes into polished write-ups.

Break Down Complex Jobs

Split big tasks into steps and track progress across a long session.

Plug Into Your Stack

Invoke APIs, databases, and dev tools as part of the conversation.

Benchmark Snapshot

Selected public scores — strong reasoning, code, and Chinese knowledge out of the box.

87.5%

MMLU-Pro

90.1%

GPQA Diamond

84.4%

Chinese-SimpleQA

93.5%

LiveCodeBench

70.98

SuperCLUE Pro · Leading score

68.82

SuperCLUE Flash · Near Pro tier

Quick Answers

Common questions before your first DeepSeek-V4 chat

What is DeepSeek-V4 in plain terms?

DeepSeek's 2026 model line built around a 1M-token window, stronger Agent behavior, and big jumps in math, code, and knowledge tasks. You choose Pro for hardest work or Flash for speed.

When should I pick Pro vs Flash?

Pick Pro for deep analysis, agentic coding, and long documents. Pick Flash for daily chat, quick drafts, and high-frequency simple prompts. Both support 1M context.

What fits in a 1M-token window?

Very long contracts, full repos, paper collections, or book-length text in one sitting — with much lower hardware cost than earlier V3.2-era 1M processing.

How do I start online?

Hit Start Chatting Now — MidassAI Chat opens in your locale. Select Pro or Flash and type your first message. Nothing to install.

Can it read images?

Yes. Use vision mode in the web chat to upload images and ask questions about charts, screenshots, or photos.

Is the model open source?

DeepSeek-V4 releases under the MIT license with open weights for community use and self-hosting.

How much better is V4 than V3.2?

V4-Pro adds large gains in agent tasks, math reasoning, and instruction following versus V3.2 — while making 1M context far cheaper to run.

Does it support vision and multimodal input?

Yes — vision mode handles image upload and chart reading in web chat. Richer audio and enterprise tooling are on the roadmap.

What does Flash cost?

Flash is the lower-cost edition for everyday prompts. Pricing varies by provider; on MidassAI Chat you can start free and pick Pro or Flash per session.

Do old API model names still work?

Legacy names like deepseek-chat and deepseek-reasoner are being retired. Move to deepseek-v4-flash and deepseek-v4-pro to stay compatible.

What is DeepSeek-V4 best for?

Long-document analysis, coding agents, STEM reasoning, translation, writing, and vision Q&A — anywhere million-token context saves time.

How strong is Chinese support?

V4 ranks among the strongest open models for Chinese dialogue, writing, and knowledge Q&A — a core reason many teams pick it over Western alternatives.

What's Next for V4

Vision is available today; richer multimodal and enterprise tooling is on the way.

  • Text — chat, writing, and analysis
  • Vision — image Q&A and chart reading
  • Audio — processing and understanding
  • Enterprise — workflows and integrations

From the Blog

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Hands-On Guides

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Start Your First V4 Chat

Million-token memory and reasoning that keeps up — open MidassAI Chat and try it now.

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