DeepSeek V4 Pro Official Release MIT Open Source

DeepSeek Web app · V4 Pro official release · Free chat

1M Context Window

3206 Codeforces Rating

MIT Open Commercial Use

Free DeepSeek web chat, plus an OpenAI-compatible API for AI chat, coding assistance, long-document processing, and API integration

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What is DeepSeek?

DeepSeek is an open-source large language model for chat, coding and long documents. This site offers a free DeepSeek web app for the V4 Pro official release, plus an OpenAI-compatible DeepSeek API for developers.

Open the DeepSeek web app What is DeepSeek AI?Read the DeepSeek API docs

1. Why choose DeepSeek?

🔥

Open Source & Free

MIT license — free for commercial use and customization

🚀

Peak Performance

Codeforces 3206 — surpassing closed-source models

🌍

Global Community

500K+ developers across 24 languages

🧩

Rich Ecosystem

API, SDK, tutorials — ready out of the box

2. Core Capabilities

📄

1M Token Context 1M

Process long documents, codebases, and complex tasks with ease.

📌 Measured: 100-page PDF analysis in just 12 seconds

🧠

Top‑Tier Reasoning 3206

Codeforces 3206, outperforming all open‑source models in STEM.

📌 Codeforces rating — surpassing all open-source models

👁️

Vision‑Primitive Mode Vision

Precise spatial reasoning with minimal token consumption.

📌 Chart & UI screenshot analysis with minimal tokens

⚡

DSpark Acceleration 85%

Speculative decoding boosts response speed by up to 85%.

📌 Speculative decoding: 45 tok/s → 83 tok/s on code generation

3. Use Cases

Explore how DeepSeek powers diverse workflows

Development

💻 Code Development 📊 Data Analysis

Smart completion, code review, bug fixing
Data cleaning, trend analysis, visualization tips

Knowledge & Research

📚 Academic Research 🎓 Education & Tutoring

Paper analysis, literature review, experiment design
Personalized learning, homework help, Q&A

Creative & Service

✍️ Creative Writing 💬 AI Customer Support

Storytelling, copywriting, content polishing
24/7 automated customer assistance

4. Benchmarks

Comparison with Closed‑Source Models

MMLU

GPT-4o: 86.4% 89.2%

GPQA Diamond

GPT-4o: 85.2% 90.1%

HumanEval

GPT-4o: 84.1% 87.5%

MATH-500

GPT-4o: 76.6% 85.3%

5. What Developers Say

"DeepSeek V4's coding ability amazed me — it solved a 3-day algorithm problem with crystal-clear explanations."

S

Sarah Chen
Senior Engineer @ Google

"As a researcher, the 1M context lets me feed entire papers for analysis — 10× productivity boost."

D

Dr. Wang
AI Researcher @ Tsinghua University

"DSpark cut our API latency from 2s to 300ms — a game-changer for user experience."

T

Tom Li
CTO @ AI Startup

6. Model Comparison

Side-by-side comparison of leading AI models

Dimension	DeepSeek V4 Pro	DeepSeek V4 Flash	GPT-4o
Context Window	1M	128K	128K
Codeforces	3206	2800+	2800+
Price / 1M Input	$0.14	$0.07	$5.00
Open Source	✅	✅	❌
Vision Mode	✅	❌	✅

7. Frequently Asked Questions

What is the DeepSeek V4 Pro official release, and how do I start?

The DeepSeek V4 Pro official release is the GA flagship model: about 1M context, vision understanding and stronger reasoning. Start a free web chat here, or call the OpenAI-compatible DeepSeek API. This site is an independent community with tutorials and guides — not the official DeepSeek company site.

Where is the DeepSeek web app? Do I need to download it?

No download needed. Use Start Chat on this site for the DeepSeek web experience. For official API keys, register at platform.deepseek.com. Try the web app first, then integrate when you are ready.

What's the difference between V4 Pro and V4 Flash?

V4 Pro is for long documents, deep reasoning and vision, with about 1M context. V4 Flash is faster and cheaper for everyday Q&A and high traffic. Unsure? Run one real task in the web app, then pick by latency and cost.

How do I use DeepSeek's free API?

Sign up at platform.deepseek.com for an API key. The API is OpenAI-compatible — set base_url to https://api.deepseek.com/v1. New accounts usually include a free quota; usage beyond that is billed per token.

How is DeepSeek different from ChatGPT?

DeepSeek is open-source with a free trial path, a longer V4 Pro context window, strong coding scores (Codeforces 3206) and usually much lower API prices than GPT-4o. ChatGPT has a more mature product ecosystem. Use our benchmarks and tutorials to choose by task.

Can I run DeepSeek locally, and which languages does it support?

Yes. Deploy with Ollama, vLLM or SGLang — see Tutorials. DeepSeek works well in Chinese and English and covers 50+ programming languages. Individuals can start in the web app; teams can move to API or local deploy.

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