Model family timeline
Last updated Apr 3, 2026
GPT-4 model releases
A source-backed timeline for the GPT-4 model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.
3
Models
1
Labs
0
Open
3
Recent
Most recent in this set
3 models
GPT-4o
RetiredOpenAIProprietary
The 2024 omni-modal model that defined a generation of assistants. Deprecated in Feb 2026 and fully retired across ChatGPT on April 3, 2026.
Type
—
Params
Undisc.
Context
128K
Top eval
—
Released
May 13, 2024
2.1y ago
—Undisc.128K ctxMay 13, 2024
GPT-4 Turbo
DeprecatedOpenAIProprietary
Lower-cost GPT-4 generation with a 128K context window, introduced at OpenAI DevDay.
Type
—
Params
Undisc.
Context
128K
Top eval
—
Released
Nov 6, 2023
2.6y ago
—Undisc.128K ctxNov 6, 2023
GPT-4
DeprecatedOpenAIProprietary
The model that brought reliable multi-step reasoning to the mainstream; size never disclosed.
Type
—
Params
Undisc.
Context
8K
Top eval
—
Released
Mar 14, 2023
3.3y ago
—Undisc.8K ctxMar 14, 2023