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DeepSeekHangzhou DeepSeek Artificial Intelligence Basic Technology Research Co., Ltd.

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DeepSeek

Hangzhou DeepSeek Artificial Intelligence Basic Technology Research Co., Ltd. · Founded 2023

DeepSeek is a Chinese AI lab building frontier large language models with an emphasis on low-cost API access. Its current API lineup is DeepSeek-V4 Pro and DeepSeek Flash, with DeepSeek-V4.1-Flash serving requests made under the retired legacy flash model names. The API is deliberately compatible with both the OpenAI and Anthropic SDK formats, so existing tools — including Claude Code, GitHub Copilot, and OpenCode — can use DeepSeek as a backend without code changes. DeepSeek also offers the Harness in developer preview for agent-harness developers, alongside free chat on web and mobile.

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Submitted by AIUnpacker

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DeepSeek

What DeepSeek is

DeepSeek is a Chinese AI lab building frontier large language models with an emphasis on low-cost API access. Its current API lineup is DeepSeek-V4 Pro and DeepSeek Flash, with DeepSeek-V4.1-Flash serving requests made under the retired legacy flash model names. The API is deliberately compatible with both the OpenAI and Anthropic SDK formats, so existing tools — including Claude Code, GitHub Copilot, and OpenCode — can use DeepSeek as a backend without code changes. DeepSeek also offers the Harness in developer preview for agent-harness developers, alongside free chat on web and mobile.

Funding snapshot

DeepSeek completed a Series A of US$7B in May 2026 at a US$52B post-money valuation. Reporting also describes an April 2026 discussion of a $300M round at a $10B valuation, and a subsequent discussion targeting a US$70B pre-money valuation (source: Wikipedia).

Key features

  • DeepSeek-V4 Pro and DeepSeek Flash model family — deepseek-v4-pro maps to DeepSeek-V4-Pro-0813 (released 13 Aug 2026) and deepseek-flash to DeepSeek-V4.1-Flash (released 10 Sept 2026), which also serves requests for retired legacy flash names
  • API compatible with both the OpenAI and Anthropic SDKs — set base_url to api.deepseek.com or api.deepseek.com/anthropic
  • DeepSeek Harness in developer preview for agent-harness developers
  • Drop-in backend for agent and coding tools including Claude Code, GitHub Copilot, and OpenCode
  • Free chat access on web and mobile apps
  • Responses API and Anthropic API compatibility guides

Where it lives

Web app (chat.deepseek.com)iOS and Android apps (download.deepseek.com)API platform (platform.deepseek.com)OpenAI SDK and Anthropic SDK compatibilityClaude Code, GitHub Copilot, and OpenCode as backend modelDeepSeek Harness (developer preview)

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Tags

#chatbot#reasoning#open-source#api#low-cost
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