MODEL LINEAGE
中文
Model index
OpenAI·GPT

GPT-4.5 Preview

A research preview scaling unsupervised learning for knowledge, natural conversation, and creative writing rather than test-time reasoning.

LegacyLanguageMultimodalWeights not released
MODEL NUMBER271
First public date
2025-02-27
Organization
OpenAI
Family
GPT
01

Specifications

Only published specifications are shown.

Context
128,000 tokens↗
Maximum output
16,384 tokens↗
Input modalities
Text · Image
Output modalities
Text
Open weights
No
Status
Legacy
02

Overview

Release dates

— GPT-4.5 Preview entered preview. ↗

03

Specifications alongside predecessor

Compared with GPT-4o ↗

PreviousGPT-4o— · 128K ctx
CurrentGPT-4.5 Preview— · 128K ctx
04

Architecture & capabilities

05

Release history

Preview

GPT-4.5 Preview entered preview.

View source
06

Related models

Select a card to view the related model.

PredecessorGPT-4oView details →
07

Sources

01
Introducing GPT-4.5OpenAI · Published 2025-02-27 · Checked 2026-09-03
Official · Verified02
OpenAI API model specificationsOpenAI · Checked 2026-09-07
Official · Verified
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