What DeepSeek is
DeepSeek is a Chinese AI lab building frontier open-weight large language models, most notably the DeepSeek-V3, V3.1, V3.2, V4-Pro, and DeepSeek-R1 reasoning families. It is best known for matching closed-model quality at significantly lower API and inference costs.
Funding snapshot
$7B Series A at $52B post-money valuation (May 2026)
Key features
- DeepSeek-V4 / V3.x and DeepSeek-R1 reasoning models
- Open-weight MIT-licensed releases
- Free chat access on web and mobile app
- Responses API and Codex-style integrations
- Cost-efficient inference for high-volume use
Where it lives
Web app (chat.deepseek.com)iOS and Android app (download.deepseek.com)API platform (platform.deepseek.com)DeepSeek Harness for evaluationSelf-hostable open weights
Alternatives to consider
Full comparisonRelated reading
2 pieces from AIUnpacker on DeepSeek
Guides and articles
1
Sources & media
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