Phi-4

Claims and evidence

• Released 12 December 2024 ● Primary source[1]page date; Today we are introducing Phi-4 [2]Model Summary, Release date [3]Submission history, v1

• Status AvailableWeights downloadable from Microsoft's Hugging Face organisation and listed as GA, with no retirement date, on the Microsoft Foundry model retirement schedule (checked 2026-10-01). ● Primary source[2] [4]Microsoft table: Phi-4, GA

• Successor of Phi-3.5 EditorialEditorial link along the core Phi line: the post calls Phi-4 the latest member of the Phi family and the report describes minimal changes to the phi-3 architecture, without naming a direct predecessor; Phi-3.5 was the most recent core text release before it. ● Primary source[1]first paragraph [3]abstract

• Change · Training data Training data extends the Phi-3 data with new synthetic textbook-like data and acquired academic books and Q&A datasets; synthetic data is used throughout.Compared with Phi-3.5 ● Primary source[2] [3]
• Change · Context length Context length is 16K tokens, compared with 128K tokens for the Phi-3.5 models.Compared with Phi-3.5 ● Primary source[2] [5]
• Change · Other Aimed at complex reasoning such as math; the report credits data quality, the training curriculum and post-training rather than architecture changes.Compared with Phi-3.5 ● Primary source[3] [1]

• Input text ● Primary source[2]Model Summary, Inputs
• Output text ● Primary source[2]Model Summary, Outputs
• Open weights Yes ● Primary source[2]Model Summary, License
• Context window 16K tokens tokens ● Primary source[2]Model Summary, Context length
• Parameters 14B ● Primary source[1] [3]abstract [2]Model Summary, Architecture
• Access API, Open-weights downloadThe api value stands for the Azure AI Foundry offering named in the announcement. ● Primary source[1] [2]

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