GPT-4.5 Preview
OpenAI · February 2025
⚠ deprecatedClosedmixture of expertsmultimodalAPI Available
Context Window128K tokens
Sunset DateJune 2026
Description
A research preview that explored massive unsupervised learning rather than reasoning improvements. Focused on emotional intelligence, creativity, and natural-sounding open-ended writing — areas where earlier models felt mechanical. Not a reasoning model; designed to feel more human in conversation.
Benchmark Scores
MMLUMassive Multitask Language Understanding — 57 subjects
85.1%GPQAGraduate-level science QA
71.4%SWE-benchReal-world software engineering
38.0%Key Innovations
Multimodal
MultimodalProcessing multiple types of input (text, images, audio, video) in a single model.
Family Tree
Built On
Lineage
GPT-1→GPT-2→GPT-3→InstructGPT / text-davinci-002→GPT-3.5 / ChatGPT→GPT-4→GPT-4 Turbo→GPT-4o→GPT-4.5 Preview