Model family

Phi

Phi is a model family from Microsoft1, with 2 assessed releases in this catalog. Licenses and availability are recorded for each release, not for the family; its releases use the MIT License.

Phi is Microsoft's family of small language models. Generations have included Phi-3, Phi-3.5, and Phi-4, with instruction, reasoning, multimodal, and vision-language variants published on Hugging Face and Microsoft Foundry. Recent Phi-4 releases include Phi-4-mini-flash-reasoning (July 2025) and Phi-4-reasoning-vision-15B (March 2026).1 2 3 4

Website: Phi product page (external site: azure.microsoft.com)
Model hub: Microsoft on Hugging Face (external site: huggingface.co)
Documentation: Phi Cookbook (external site: github.com)

Last reviewedSep 29, 2026Entry updated Sep 29, 2026Documented release Unknown

Releases assessed

Each release is assessed on its own. This family has no family-wide openness label.

Releases in the Phi family
Release	Weights	Tier (USASI rubric v0.2)	License	Released
Phi-4-mini-flash-reasoning	Weights: Public	Model-disclosure tier (USASI rubric v0.2): Open-weight	MIT	Jul 9, 2025
Phi-4-reasoning-vision-15B	Weights: Public	Model-disclosure tier (USASI rubric v0.2): Open-weight	MIT, MIT	Mar 4, 2026

What it is useful for

Microsoft positions Phi models for cost-constrained and low-latency tasks, and for local, on-device, or edge deployment as well as the cloud.1

Organization context

Microsoft

U.S. eligibility

Project eligibility rests on documented governing or maintaining entities, not on contributors.

Eligible · basis: U.S. headquarters

The Phi-4-reasoning-vision-15B model card names Microsoft Corporation as developer, and Microsoft lists Redmond, Washington as its address on its Form 10-K cover page.2 5

Assessed Sep 29, 2026

Sources

1.
Phi Open Models - Small Language Models | Microsoft Azure (external site: azure.microsoft.com)
Microsoft · Official page · accessed Sep 29, 2026
2.
microsoft/Phi-4-reasoning-vision-15B model card (external site: huggingface.co)
Microsoft (Hugging Face) · Model card · published Mar 4, 2026 · accessed Sep 29, 2026
3.
microsoft/Phi-4-mini-flash-reasoning model card (external site: huggingface.co)
Microsoft (Hugging Face) · Model card · published Jun 2025 · accessed Sep 29, 2026
4.
Reasoning reimagined: Introducing Phi-4-mini-flash-reasoning (external site: azure.microsoft.com)
Microsoft Azure · Announcement · published Jul 9, 2025 · accessed Sep 29, 2026
5.
Microsoft Corporation Form 10-K for the fiscal year ended June 30, 2026 (external site: sec.gov)
Microsoft Corporation (U.S. SEC filing) · Filing · published Jul 29, 2026 · accessed Sep 29, 2026

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APA style

USASI. (2026, September 29). Phi. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/open/phi/

BibTeX

@misc{usasi_phi,
  author = {{USASI}},
  title = {Phi},
  year = {2026},
  month = sep,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/open/phi/}},
  note = {United States of America Superintelligence. Last updated 2026-09-29}
}

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Releases assessed

What it is useful for

Organization context

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