LLMilestonesA milestone timeline of AI and large language models

Act VI · The frontier and its limits

Open modelDeepSeek

DeepSeek-V4

Released two open-weight models, V4-Pro and V4-Flash, with a 1M-token context.

1.6TV4-Pro total parameters, 49B active

Why it matters

Open models matched the closed frontier on scale and context length, at a fraction of the API price of closed flagships.

Built on

DeepSeek-R1

Source: api-docs.deepseek.com ↗

Official page not opened for verification; URL taken from citations in multiple reports.

See it on the 3D timeline →