AI THREAT TRACKER / EV-054 · Model release

DeepSeek releases V4 preview weights

Downloadable Pro and Flash models extend long-context agent work.

Model labDeepSeek

TopicsModel release

OCCURRED24 Apr 2026

PUBLIC ACCOUNT24 Apr 2026

EVIDENCEFirst-party account

About these dates

Date of the developer announcement or dated release record.

DeepSeek released preview versions of V4 Pro and Flash with open weights and access through its chat service and API. The family introduced a one-million-token default context and changes intended to support reasoning and agent tasks. DeepSeek ↗

Sources & attribution

Organizational disclosure 24 Apr 2026
DeepSeek releases V4 preview weights ↗
DeepSeek. Original developer announcement.