Model family
Phi
Family overview — summarizes releases; licenses and availability belong to each release.
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).1234
- 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 reviewedEntry updated Documented release
Releases assessed
Each release is assessed on its own. This family has no family-wide openness label.
| Release | Weights | Tier (USASI rubric v0.1) | License | Released |
|---|---|---|---|---|
| Phi-4-mini-flash-reasoning | Weights: Public | Model-disclosure tier (USASI rubric v0.1): Open-weight | MIT | Jul 9, 2025 |
| Phi-4-reasoning-vision-15B | Weights: Public | Model-disclosure tier (USASI rubric v0.1): 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
U.S. eligibility
Project eligibility rests on documented governing or maintaining entities, not on contributors.
Sources
This listing is not an endorsement, a safety assessment, or a federal approval.