AI Radar

MAI-DS-R1

Available · Language, Reasoning

MAI-DS-R1 is an open-weights reasoning model released by Microsoft on 17 April 2025: a version of DeepSeek-R1 that the Microsoft AI team post-trained to answer topics the original blocked and to improve its risk profile. The weights are on Hugging Face under the MIT licence; the hosted API on Azure AI Foundry was retired on 27 February 2026. [1] [2] [3]Microsoft table: MAI-DS-R1 Primary source

Timeline of MAI-DS-R1 →

Claims and evidence

  • Released Primary source[1]page date and first paragraph
  • Retired from Microsoft Foundry Suggested replacement on the page: any DeepSeek model available in the model catalog. Primary source[3]Microsoft table: MAI-DS-R1
  • Status AvailableWeights remain downloadable from Microsoft's Hugging Face organisation (checked 2026-10-01). The hosted API on Microsoft Foundry was retired on 2026-02-27 (see milestones). Primary source[2]weights and licence (MIT)
  • Derived from (fine tune) DeepSeek-R1 (DeepSeek) Primary source[2]
    • Open weights Yes Primary source[1]first paragraph; Conclusion [2]licence: MIT
    • Parameters Not disclosedMicrosoft states no parameter count for MAI-DS-R1 itself; the model card gives 671B only as the size of the pre-trained base model, DeepSeek-R1, from another organisation. Primary source[2]Model Architecture and Objective: Pre-trained Model Base
    • Access API, Open-weights downloadAt release: Azure AI Foundry hosted API and Hugging Face weights, including quantized versions. The Foundry API was retired on 2026-02-27. Primary source[1]first paragraph; Conclusion

    Lineage

    Predecessors

    No known predecessor.

    Successors

    No known successor.

    Based on

    • DeepSeek-R1 · DeepSeek · 20 January 2025 · derived (fine tune)

    Variants and derived

    None recorded.

    Siblings

    None recorded.

    All ancestors

    All descendants

    None.

    Variants

    No variants recorded in this record.

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