DeepSeek
Visit DeepSeek →About DeepSeek
DeepSeek is a Chinese AI lab that has built a reputation for releasing frontier-quality open-source models at remarkably low cost. DeepSeek V4 Preview, released April 24, 2026, comes in two variants: V4-Pro with 1.6 trillion total parameters (49 billion active) and V4-Flash with 284 billion parameters (13 billion active). Both support a 1 million token context window, enabling analysis of entire codebases, legal documents, or book-length texts in a single session.
The architectural innovation in V4 is the Hybrid Attention system, combining Compressed Sparse Attention (CSA) and Hierarchical Context Aggregation (HCA). At 1 million token context, V4-Pro uses only 27% of the FLOPs required by DeepSeek V3.2 — a dramatic efficiency improvement that makes long-context tasks economically viable at scale.
Three reasoning effort modes — light, standard, and deep — let users trade off response speed against reasoning depth. Light mode is fast and suited for straightforward tasks; deep mode engages extended chain-of-thought for complex multi-step problems. This flexibility is valuable for developers building applications with mixed workloads.
Pricing is aggressive: V4-Flash costs $0.14 per million input tokens and $0.28 per million output tokens. V4-Pro costs $0.145 per million input tokens and $3.48 per million output tokens. Both models are open-source and can be self-hosted, making DeepSeek the most cost-efficient option for teams running high-volume inference or needing on-premises deployment for data privacy.
DeepSeek's web chat interface at chat.deepseek.com is free to use with no account required for basic access. The primary limitation compared to ChatGPT or Claude is the ecosystem: no voice mode, no image generation, no native app integrations. DeepSeek is a developer and researcher tool first, and a consumer product second.
- V4-Pro: 1.6T params, 49B active, 1M token context — frontier performance at open-source pricing
- Hybrid Attention (CSA + HCA) — V4-Pro uses only 27% FLOPs vs V3.2 at 1M token context
- Three reasoning effort modes (light/standard/deep) — tune speed vs depth per request
- V4-Flash API at $0.14/$0.28 per million tokens — among the cheapest frontier-quality models
- Fully open-source — self-hostable for data privacy and on-premises deployment
- No voice mode, image generation, or consumer app integrations
- Web interface less polished than ChatGPT or Claude — developer-first product
- Data privacy concerns for users who cannot self-host (Chinese company, cloud inference)
- V4-Pro output at $3.48/M tokens is expensive for high-volume output workloads
- Ecosystem and plugin support significantly smaller than OpenAI or Anthropic
Choose DeepSeek if…
- ✅ You want the best free AI for reasoning and math — DeepSeek R1 rivals o1 at zero cost
- ✅ You're a developer needing very cheap API access — DeepSeek's API is 20-40× cheaper than GPT-4
- ✅ You work on coding and technical problems that benefit from chain-of-thought reasoning
- ✅ You don't need image generation or voice and want maximum reasoning value for free
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