1 Million Token Ultra-Long Context
Every DeepSeek tier ships a 1M-token window—load entire books, monorepos, or marathon chat logs in one pass. V4-Pro needs only 27% of V3.2 FLOPs per token at 1M scale.
DeepSeek million contextDeepSeek-V4 · Web Chat Online
DeepSeek-V4 Web Use Online · Direct Chat Access
Go straight to the DeepSeek-V4 web app and start chatting instantly. This next-generation high-performance AI responds fast with clear logic—no install, no sign-up. Just open your browser and talk.
1M
Token Context
Standard across DeepSeek
SOTA
Agent Capability
DeepSeek open-source lead
5M
Free Tokens
New DeepSeek accounts
MIT
Open Source
DeepSeek commercial-ready
DeepSeek core capabilities
Six pillars that define DeepSeek
Performance and value converge in DeepSeek—giving developers, researchers, and knowledge workers production-grade AI they can afford at scale.
Open-Source SOTA Agent Capability
Agentic Coding sets the open-source bar; plug DeepSeek into Claude Code, OpenClaw, or OpenCode, or mirror how our own R&D teams run on it daily.
DeepSeek Agent capabilityDeep Thinking & Reasoning
Toggle Non-think, Think High, or Think Max on demand—the DeepSeek reasoning stack tops public math, STEM, and competitive programming benchmarks among open models.
DeepSeek deep reasoningMoE Dual-Version Architecture
DeepSeek Pro (1.6T / 49B active) rivals elite closed models; Flash (284B / 13B active) optimizes throughput. Both flip between Thinking and Non-Thinking modes.
DeepSeek MoE architectureMultimodal Image Understanding
DeepSeek vision mode is live on web and App—"Thinking with Visual Primitives" goes well beyond OCR to interpret images semantically.
DeepSeek multimodal visionExceptional Cost Performance
Sign up for DeepSeek, claim 5M free tokens, and chat free on web or App; V4-Flash from $0.14/M input keeps fleet-scale workloads predictable.
DeepSeek high value DeepSeek benchmarks
DeepSeek-V4 on leading evaluations
Strong results across reasoning, coding, knowledge, and Chinese suites—numbers that explain why specialists pick DeepSeek.
87.5%
MMLU-Pro
Standout multi-task knowledge and reasoning
90.1%
GPQA Diamond
Flagship-level hard science Q&A
84.4%
Chinese-SimpleQA
Solid Chinese factual answering
93.5%
LiveCodeBench
Live coding scores lead the open-source pack
3206
Codeforces
Contest rating reflects strong code reasoning
70.98
SuperCLUE Pro
Top-tier Chinese composite ranking
1M
Long context
Million-token window across the lineup
+20
Agent lift
Major Agent gains vs the prior generation
+10
Math reasoning
Continued STEM and math improvements
27%
1M compute share
Far less compute for the same long context
Scores and deltas come from public evaluations and official materials; versions and setups may differ. Always check the latest DeepSeek official notes.
Try DeepSeek-V4 Web App Now
Open your browser to start chatting online—fast responses, clear logic, no install, no sign-up. Begin a smooth AI experience right away.
DeepSeek comparison
Why professionals pick DeepSeek
Versus ChatGPT-style general assistants, DeepSeek separates on context length, Agent tooling, coding depth, and API economics.
| Comparison Dimension | DeepSeek | ChatGPT / General AI |
|---|---|---|
| Context Length | DeepSeek standard 1M tokens—whole books and large repos in one shot | Relatively limited context window; long documents require segmentation |
| Agent Capability | DeepSeek open-source SOTA; mainstream Agent stacks plug in cleanly | General conversation focused; Agent integration requires extra configuration |
| Coding Performance | DeepSeek MoE tuning drives standout Agentic Coding results | Strong general language understanding; relatively average coding specialization |
| Reasoning Depth | DeepSeek three reasoning tiers; STEM and contest benchmarks lead | Good reasoning ability, but coarser granularity of intensity control |
| API Pricing | DeepSeek V4-Flash input $0.14/M—highly competitive | Higher pricing; significant cost at scale |
| Open-Source Ecosystem | DeepSeek MIT open source—deploy and customize locally | Closed-source model; no local deployment or customization |
Context Length
DeepSeek
DeepSeek standard 1M tokens—whole books and large repos in one shot
ChatGPT
Relatively limited context window; long documents require segmentation
Agent Capability
DeepSeek
DeepSeek open-source SOTA; mainstream Agent stacks plug in cleanly
ChatGPT
General conversation focused; Agent integration requires extra configuration
Coding Performance
DeepSeek
DeepSeek MoE tuning drives standout Agentic Coding results
ChatGPT
Strong general language understanding; relatively average coding specialization
Reasoning Depth
DeepSeek
DeepSeek three reasoning tiers; STEM and contest benchmarks lead
ChatGPT
Good reasoning ability, but coarser granularity of intensity control
API Pricing
DeepSeek
DeepSeek V4-Flash input $0.14/M—highly competitive
ChatGPT
Higher pricing; significant cost at scale
Open-Source Ecosystem
DeepSeek
DeepSeek MIT open source—deploy and customize locally
ChatGPT
Closed-source model; no local deployment or customization
Choose ChatGPT for casual dialogue; for long docs, Agents, and heavy reasoning, DeepSeek wins on efficiency—professional output at lower API spend.
DeepSeek use cases
Every workflow, a DeepSeek answer
Developers, enterprise leads, scholars, and creators all route hard problems through DeepSeek for professional-grade AI.
Developer Programming & Code Generation
Agentic Coding ingests massive repos, writes patches, and chases bugs—wire DeepSeek into Claude Code or OpenCode and watch cycle time shrink.
DeepSeek coding guideAcademic Research & Long Document Analysis
Drop full papers, datasets, or reports into a 1M-token window; DeepSeek synthesizes literature reviews and cross-document insights.
DeepSeek academic writing guideEnterprise Knowledge Management & Agent Automation
At aggressive DeepSeek API rates, spin up support bots, doc Q&A, and workflow Agents inside your existing stack.
DeepSeek API guideContent Creation & Multimodal Processing
Pair live web search with DeepSeek vision—upload images for deep reads, then draft copy grounded in fresh data.
DeepSeek content creation guideComplex Reasoning & Mathematical Problem Solving
Think Max pushes DeepSeek to the top of math, STEM, and programming contest charts—built for precision-heavy engineering work.
Pro vs Flash: how to choose DeepSeek product updates
2025–2026 DeepSeek release highlights
DeepSeek ships fast—here are the milestones worth your attention right now.
Open Source
DeepSeek Harness Developer Preview Goes Open Source
DeepSeek has released the open-source Agent runtime DeepSeek Harness (dsh): everything is a plugin, complementary to chatting with DeepSeek-V4 on the web version—validate the task in the web version first, then assemble plugins locally as needed.
New Feature
DeepSeek multimodal vision goes GA
Web and App now accept image uploads with deep visual analysis via the "Thinking with Visual Primitives" framework.
Pricing
DeepSeek V4-Pro API cut 75%
V4-Pro pricing drops to one-quarter of the prior rate—lowering the bar for teams standardizing on DeepSeek.
Milestone
DeepSeek-V4 preview open sourced
V4 preview lands under MIT with Expert Mode—marking a new chapter for the DeepSeek ecosystem.
Capability Upgrade
DeepSeek 1M context now standard
Web and App default to 1M tokens, lifting DeepSeek long-document throughput across the board.
Latest DeepSeek content
Blog & tutorial updates
Fresh guides on DeepSeek Web, DeepSeek-V4 practice, and getting started—so you can ship faster.
Latest posts
View all posts →- How to Use DeepSeek for Document Summaries: Web Long-Form Digests, Key Points & Action Lists
How to use DeepSeek for document summaries? Use the DeepSeek web version to turn long reports, contract highlights, and meeting materials into structured digests, risk points, and action lists—covering DeepSeek-V4 summary templates and prompts.
- How to Use DeepSeek for Business Proposals: Web Structure, Pain-Point Proof & Pricing Boundaries
How to use DeepSeek for business proposals? Use the DeepSeek web version to organize customer pain points, proposal structure, implementation path, and pricing boundaries—covering DeepSeek-V4 business proposal templates and prompts.
- How to Write SOP with DeepSeek: Web Version Process Breakdown, Checklists & Training Materials
How to write SOP with DeepSeek? Use the DeepSeek web version to turn verbal know-how into steps, checklists, and exception tables—DeepSeek-V4 SOP templates and prompts included.
Latest tutorials
View all tutorials →- DeepSeek Meeting Notes in 5 Minutes: Web Quick Guide to Action Items
How to turn meeting notes into minutes fast with DeepSeek? A 5-minute tutorial: open DeepSeek web, paste notes, use a template, extract decisions and action items—zero experience needed.
- How to Start Using DeepSeek? Finish Your First Web Chat in 3 Minutes
How to start using DeepSeek? In 3 minutes, learn to open DeepSeek web, send your first message, and understand Pro/Flash and common modes—so beginners can experience DeepSeek-V4 online chat right away.
- How to Ask DeepSeek Better? 5 Prompt Tips Anyone Can Use
How to ask DeepSeek better? Five DeepSeek web prompting tips for ordinary users: clarify the task, constrain format, add background, give examples, and iterate in multi-turn—instantly raise DeepSeek-V4 answer quality.
DeepSeek FAQ
Common questions about DeepSeek
Features, onboarding paths, and API pricing—everything you need before you commit to DeepSeek.
01 What core features does DeepSeek support?
Ultra-long 1M-token context, Agent tooling, three reasoning intensities, multimodal vision, web search, uploads, and RESTful APIs—Pro and Flash tiers both switch Thinking / Non-Thinking modes.
02 How large is the context window—and what can I feed it?
DeepSeek ships 1M tokens standard: whole books, large codebases, or sprawling chat histories load without manual chunking.
03 How do I try DeepSeek at zero cost?
Register for 5M free tokens—no card required. Use chat.deepseek.com, the official App, or our app site to talk to DeepSeek immediately.
04 How does DeepSeek API pricing work?
REST endpoints are ready day one: V4-Flash $0.14/M in, $0.28/M out; V4-Pro $1.74/M in, $3.48/M out, with lower cache-hit rates. See DeepSeek official API docs for details.
05 Which uploads and vision formats does DeepSeek handle?
DeepSeek ingests documents and images, extracting text where needed; vision mode analyzes pictures semantically—not just OCR.
06 DeepSeek vs ChatGPT—where does each shine?
ChatGPT favors open-ended chat; DeepSeek MoE excels at code, Agents, long context, and benchmark reasoning with leaner API bills—pick DeepSeek for specialist workloads.
07 DeepSeek-V4-Pro vs Flash—what’s the difference?
Pro targets hard reasoning, long documents, and Agent work; Flash is lower latency and cost for daily chat and high-volume simple tasks. Both support million-token context. Unsure? Use Flash for easy jobs, Pro for hard ones—or run both once and compare.
08 How do I open DeepSeek Web? Do I need to install anything?
No install. Use “Try now” on this site to open DeepSeek Web in your browser. Bookmark the page to avoid fake lookalikes. Mobile browsers work too.
09 Do old DeepSeek API model names need migration?
Watch official deprecation notices. Names like deepseek-chat / deepseek-reasoner may move to deepseek-v4-flash / deepseek-v4-pro. Follow official docs and deadlines; regress in staging before production.
10 Does DeepSeek support vision / multimodal?
Yes. DeepSeek Web and the App offer vision mode for semantic image analysis (not just OCR). Clear images plus a clear task and output format usually work better.
11 Which use cases fit DeepSeek best?
Long-doc analysis, coding and Agent automation, STEM reasoning, translation and writing, meeting notes, study prep, content creation, and API integration. Prefer DeepSeek when you need long context or cost-efficient calls.
12 How strong is DeepSeek’s Chinese capability?
DeepSeek is deeply optimized for Chinese understanding and generation—chat, writing, Q&A, and CN–EN assist. Still human-edit formal outbound copy.
Your next idea belongs in DeepSeek
Load a million tokens, dial reasoning intensity, automate with Agents—DeepSeek backs every decision with AI.