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DeepSeek releases V4, a 1.6-trillion-parameter open-weights model with 1M context
DeepSeek published V4-Pro (1.6tn parameters, 49bn active) and V4-Flash (284bn, 13bn active) under the MIT licence, both with a one-million-token context window and a new compressed attention design. Reported API prices were $1.74/$3.48 per million input/output tokens for Pro and $0.14/$0.28 for Flash.
Why it matters
It kept freely downloadable Chinese models within months of the closed frontier at a fraction of the price, complicating Western strategies that rely on controlling model access.
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Connections our researchers recorded
- DevelopmentDeepSeek releases R1 reasoning model with open weights under MIT licence20 Jan 2025 · Model release · CNFollows from: Successor to the R1-era open releases
What led here
Earlier developments on the same thread
- DevelopmentOpenAI launches ChatGPT Health, linking medical records and wellness apps7 Jan 2026 · Launch · US
- DevelopmentUK High Court rejects Getty's secondary copyright claim against Stability AI4 Nov 2025 · Enforcement or ruling · GB
- DevelopmentChina's State Council issues 'AI+' plan targeting 90% AI-agent penetration by 203026 Aug 2025 · Policy · CN
- DevelopmentECMWF puts its machine-learning weather model AIFS into operational use25 Feb 2025 · Launch · INTL, EU
What happened next
Later developments on the same thread
- DevelopmentUS export-control order forces global shutdown of Claude Fable 5 and Mythos 512 Jun 2026 · Enforcement or ruling · US
Same story elsewhere
What other countries and bodies did on this
- DevelopmentGoogle releases MedGemma 1.5 and MedASR open medical models13 Jan 2026 · Model release · US, IN
- DevelopmentAnthropic withholds Claude Mythos Preview, gives it to defenders via Project Glasswing7 Apr 2026 · Model release · US
- DevelopmentOpenAI launches GPT-6 Astra, first model it rates 'Critical' for cyber capability3 Sep 2026 · Model release · US
- DevelopmentGoogle launches Gemini 3 Pro, shipping it in Search on day one18 Nov 2025 · Model release · US
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