DHS Bans DeepSeek and Everything It Touched
DHS barred DeepSeek from civilian agencies under a June order whose ban on anything "developed using" DeepSeek no vendor can verify, a security expert says.
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At a glance
DeepSeek develops AI language and reasoning models. Coverage follows its research, open model releases and their implications for the AI industry.
- Focus
- Language models; reasoning; open model releases
- Reference
- DeepSeek
Reviewed 19 October 2026. Dates retain the precision of the source; retrospective disclosures are identified in the event. No verified public ARR or recognized-revenue series was established in this review. Model-training cost is not company revenue.
Company milestones
Revenue, funding, product launches and major company events, newest first. Expand the earlier milestones for more history.
Opens its in-house Search and Fetch API
DeepSeek adds developer access to its search engine, alongside a V4.1 Flash update.
Source: DeepSeekReleases V4.1 Flash
The new architecture adds native visual understanding and updates the commercial API model lineup.
Source: DeepSeek
Show earlier milestonesHide earlier milestones2026–2023 · 7 milestones
Earlier revenue, financing and company milestones.
V4 Pro reaches general availability
The release reaches app, web and API, adding native Responses API support.
Source: DeepSeekV4 Flash enters public beta
The API model advances agent capabilities ahead of V4 Pro’s general release.
Source: DeepSeekIntroduces the V4 family
V4 Pro and Flash enter the API; legacy model names begin a migration period.
Source: DeepSeekReleases V3.2
Thinking and non-thinking API modes move to a shared upgraded model generation.
Source: DeepSeekReleases R1 reasoning models
R1 and distilled models expand open-weight reasoning access under MIT licensing.
Source: DeepSeekReleases DeepSeek V3
The model upgrades the commercial chat API and establishes the base for subsequent reasoning releases.
Source: DeepSeekDeepSeek is founded
The Hangzhou-based research company begins developing language models, preceding its V3 and R1 releases.
Source: DeepSeek company profile
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