Phi-4

14B parameter dense Transformer with emphasis on synthetic data for complex reasoning. Surpasses its teacher model on STEM benchmarks. Also released as Phi-4 Mini (3.8B, 128K context) and Phi-4 Reasoning (chain-of-thought, April 2025).

Phi-4 Reasoning Plus achieved 78% on AIME 2025, beating QwQ-32B despite being less than half the size. AA Intelligence Index: 10. MIT License.