AI Model Release Tracker - Timeline of Major AI Models from 2022-2026

AI Model Release Tracker

OpenAI – AI Models

Release cadence

Days since last release
23 Apr 2026
56
Average
26
Recent releases
23 Apr 2026 · GPT-5.5, GPT-5.5-Pro
49
5 Mar 2026 · GPT-5.4, GPT-5.4-Pro
2
3 Mar 2026 · GPT-5.3-Instant
19
12 Feb 2026 · GPT-5.3-Codex-Spark
7
5 Feb 2026 · GPT-5.3-Codex
56
Expected next release
Overdue
May 19, 2026
30 days ago

Release Frequency (Per Month)

New OpenAI models shipped each calendar month.

43210Nov 22May 24Sep 24Jan 25Mar 25May 25Aug 25Nov 25Feb 26Apr 26

Releases by Year

Year-over-year OpenAI totals. 2026 is partial (through Jun 18).

20221
20231
20245
202519
2026(YTD)7

Best benchmark scores

SWE-Bench Pro
GPT-5.5
58.6%
Humanity's Last Exam
GPT-5.5
41.4%
OSWorld-Verified
GPT-5.5
78.7%
ARC-AGI-2
GPT-5.5
84.6%
GDPval-AA
GPT-5.5
1769

All Releases

33 releases · Nov 30 2022 – Apr 23 2026

2026

7 releases
GPT-5.5
Apr 23
GPT-5.5-Pro
Apr 23
GPT-5.4
Mar 5
GPT-5.4-Pro
Mar 5
GPT-5.3-Instant
Mar 3
GPT-5.3-Codex-Spark
Feb 12
GPT-5.3-Codex
Feb 5

2025

19 releases
GPT-5.2
Dec 11
GPT-5.1-Codex-Max
Nov 19
GPT-5.1
Nov 12
GPT-5-Codex-Mini
Nov 8
GPT-5-Codex
Sep 15
GPT-5
Aug 7
GPT-5 mini
Aug 7
gpt-oss-120b
Aug 5
gpt-oss-20b
Aug 5
o3-pro
Jun 10
GPT-4.1
May 14
GPT-4.1 mini
May 14
o3
Apr 16
o4-mini
Apr 16
o4-mini-high
Apr 16
o1-pro
Mar 19
GPT-4.5
Feb 27
o3-mini
Jan 31
o3-mini-high
Jan 31

2024

5 releases
o1
Dec 5
o1-preview
Sep 12
o1-mini
Sep 12
GPT-4o mini
Jul 18
GPT-4o
May 13

2023

1 release
GPT-4
Mar 14

2022

1 release
GPT-3.5
Nov 30

Other Companies

Anthropic
Google
Meta
xAI
DeepSeek
Mistral
Moonshot AI
Cursor

About OpenAI

Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research. AI Release Tracker has logged 33 OpenAI models, from GPT-3.5 (Nov 30 2022) through GPT-5.5 (Apr 23 2026). Every release below links to a dedicated page with benchmarks, parameters, and context window.