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Phi is a family of compact language models from Microsoft Research that proves small models can be remarkably capable. Phi-4, with 14 billion parameters, competes with models 10 times its size on reasoning and coding tasks.
Microsoft trains Phi on carefully curated, high-quality data, including synthetic examples. This allows compact models to achieve quality comparable to much larger counterparts. Phi-4 Reasoning adds a chain-of-thought reasoning mode.
Phi is available under the MIT license and can run on a regular laptop or even a smartphone. Models are accessible via Azure AI, Hugging Face, and Ollama. Phi-4 Reasoning Plus shows excellent results on mathematical and logical tasks.
Phi is ideal for developers who need an AI model for resource-constrained devices: edge computing, mobile apps, and IoT. It is also well-suited for fine-tuning on specialized tasks.
14B parameters — runs on a laptop, smartphone, or edge device
Chain-of-thought mode for complex mathematical and logical tasks
Fully open license for commercial and research use
Impressive coding results at a small model size
Optimized for on-device inference without cloud — ONNX, Core ML, TensorRT
Built-in integration with the Microsoft Azure ecosystem for enterprise use
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