DeepSeek
What is DeepSeek?
Chinese AI lab's flagship assistant -- near-frontier reasoning and coding performance at a fraction of GPT and Claude's API cost, with a free, unlimited web chat.
DeepSeek is built by Hangzhou DeepSeek Artificial Intelligence Basic Technology Research, a Chinese AI lab known for open-weight models that match or approach Western frontier labs on reasoning and coding benchmarks at dramatically lower cost. The DeepSeek V4 family (Flash and Pro tiers) ships with a native 1-million-token context window, and the web chat at chat.deepseek.com is completely free for individuals with no paywalled features.
What are DeepSeek's key features?
Free, unlimited web chat
No Plus/Pro paywall on the core chat experience, with file uploads and long conversations included at no cost.
1M token context window
Every model in the V4 family ships with a native 1-million-token context, well above most competing chat assistants.
Ultra-low API pricing
Roughly 35-100x cheaper per token than GPT-5.5 or Claude Opus 4.8, making high-volume API use dramatically more affordable.
Strong reasoning and coding benchmarks
Performs near frontier-model level on many technical benchmarks despite the much lower cost.
Open-weight availability
Model weights are open, letting technical teams self-host or fine-tune rather than relying solely on the hosted API.
Free developer token grant
New API accounts receive a 5-million-token grant valid for 30 days to test integration before paying.
What are DeepSeek's pros and cons?
Pros
- Web chat is completely free with no paywalled features
- API pricing is roughly 35-100x cheaper than GPT-5.5 or Claude Opus 4.8
- Native 1M token context window on every model
- Strong reasoning/coding benchmarks despite the low cost
Cons
- Built by a Chinese company, which may raise data-residency or compliance concerns for some organizations
- Peak-hour "Server Busy" throttling on the free web chat
- Smaller third-party tooling ecosystem than ChatGPT or Claude
What can you use DeepSeek for?
How much does DeepSeek cost?
The DeepSeek web chat and mobile app are free for individuals, with no Plus/Pro paywall on file uploads or long conversations (subject to fair-use throttling during peak hours). Via the API, DeepSeek V4 Flash costs $0.14 per 1M input tokens / $0.28 per 1M output tokens, and V4 Pro costs $0.435 / $0.87 per 1M tokens -- roughly 35-100x cheaper than GPT-5.5 or Claude Opus 4.8. New developer accounts get a free 5-million-token grant valid for 30 days.
Web Chat (Free)
- Unlimited chat for individuals
- No paywalled features
- File uploads included
API -- V4 Flash
- Input / output token pricing
- 1M token context window
- Cache-hit discounts available
API -- V4 Pro
- Higher-capability tier
- Same 1M token context window
- 5M free tokens for new accounts (30 days)
How to use DeepSeek
- Go to chat.deepseek.com or download the mobile app, and sign up free.
- Start chatting -- there is no paywall on core features like file uploads or long conversations.
- For developers, get an API key from the DeepSeek platform to integrate V4 Flash or V4 Pro programmatically.
- Use the free 5-million-token grant to test API integration before committing to paid usage.
- Monitor peak-hour throttling on the free web chat, and consider the API if you need guaranteed availability.
Best DeepSeek alternatives
ChatGPT
Broader plugin ecosystem and more mature multimodal features (voice, image generation) if cost is not the deciding factor.
Claude
Stronger for careful long-document reasoning and coding tasks where output quality matters more than raw cost.
Mistral
Another cost-efficient option, with a European base that may matter for data-residency requirements.
Kimi AI
A comparable low-cost Chinese-built alternative worth comparing on your specific benchmark needs.
Is DeepSeek worth it?
DeepSeek delivers near-frontier reasoning and coding performance at a fraction of GPT or Claude's cost, backed by a genuinely unlimited free web chat and a massive native context window. Organizations with strict data-residency or compliance requirements will find it a harder sell given its origin, and peak-hour throttling on the free chat makes it unreliable for time-sensitive professional use without paying for API access.
How we write this page: details come from the tool's official site, documentation and pricing page, plus published reviews where noted. We have not tested every feature hands-on, and prices and limits change, so confirm them on the official site before you buy.
Frequently Asked Questions
Is DeepSeek really free?
Yes, the web chat and mobile app are free for individuals with no paywalled features, subject to fair-use throttling during peak hours.
Why is the API so much cheaper than GPT or Claude?
DeepSeek's training and inference approach is significantly more compute-efficient, letting it price API access at roughly 35-100x less per token than comparable Western models.
Is it safe to use DeepSeek for sensitive data?
Because it is built by a Chinese company, some organizations have data-residency or compliance concerns -- evaluate your specific regulatory requirements before using it for sensitive workloads.
What does the 1M token context window mean in practice?
It can hold roughly a very long document or codebase in a single conversation without losing earlier context, useful for large-document analysis or big codebases.
Can I run DeepSeek myself instead of using the hosted API?
Yes, the models are open-weight, so technical teams can self-host or fine-tune them rather than relying solely on DeepSeek's hosted service.
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