Phi-4-mini

Claims and evidence

• Released 26 February 2025 ● Primary source[1]page date and first paragraph [2]Training, Model: Release date February 2025

• Status AvailableWeights remain downloadable from Microsoft's Hugging Face organisation; Microsoft Foundry lists the model as GA without a retirement date (checked 2026-10-01). ● Primary source[2]weights and licence (MIT) [3]Foundry Models from partners and community, Microsoft: Phi-4-mini-instruct, GA, no retirement date

• Successor of Phi-3.5The technical report calls Phi-3.5-Mini, the mini variant of the Phi-3.5 release, the predecessor of Phi-4-Mini. ● Primary source[4]Abstract [2]Training, Model: Architecture [5]FAQ: What are the latest Phi models?

• Change · Languages Vocabulary grows to 200K tokens, which Microsoft says is meant to serve multilingual applications better than Phi-3.5-mini.Compared with Phi-3.5 ● Primary source[4] [2]Training, Model: Architecture
• Change · Architecture Adds grouped-query attention and shared input and output embeddings compared with Phi-3.5-mini.Compared with Phi-3.5 ● Primary source[2]Training, Model: Architecture
• Change · Tool use Microsoft lists built-in function calling as new compared with Phi-3.5-mini.Compared with Phi-3.5 ● Primary source[5]FAQ: What are the latest Phi models?

• Input text ● Primary source[2]Training, Model: Inputs
• Output text ● Primary source[2]Training, Model: Outputs
• Feature Function calling ● Primary source[1]What is Phi-4-mini? [2]Usage: Tool-enabled function-calling format
• Feature MultilingualThe model card lists 23 supported languages. ● Primary source[2]Training, Model: Supported languages
• Open weights Yes ● Primary source[2]licence: MIT
• Context window 128K tokensThe announcement writes 128,000 tokens. ● Primary source[2]Training, Model: Context length [1]What is Phi-4-mini?
• Parameters 3.8B ● Primary source[1]What is Phi-4-mini? [2]Training, Model: Architecture
• Access API, Open-weights download, cloud partnerAt launch: Azure AI Foundry (api), Hugging Face (open-weights-download) and the NVIDIA API Catalog (cloud-partner). ● Primary source[1]first paragraph; Learn more about Phi-4

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