IBM AIX (Advanced Interactive eXecutive) is IBM’s proprietary UNIX operating system, built for enterprise-grade reliability, scalability, and performance. Based on UNIX System V with BSD extensions, AIX is POSIX-compliant and optimized for IBM’s POWER architecture, running mission-critical workloads across industries like banking, telecom, and healthcare.
First launched in 1986 for the IBM RT PC, AIX gained prominence with the RS/6000 systems in 1990, becoming the cornerstone OS for IBM enterprise servers. Over the decades, it evolved through major hardware generations—from RS/6000 and pSeries, to System p, and finally to today’s IBM Power Systems.
Today, IBM Power Systems with POWER10 processors continue to deliver enterprise resilience, hybrid cloud integration, and AI-driven performance—cementing AIX’s legacy as one of the most robust UNIX platforms in modern computing.
IBM AIX Release History
The following table tracks the major milestones of AIX, showing how the OS has matured from a workstation experiment into a hybrid-cloud essential.
| Version | Release Year | Architecture / Hardware | Key Features |
| AIX 1.1 | 1986 | IBM RT PC | Initial release; based on System V R1/R2. |
| AIX 3.1 | 1990 | RS/6000 | Introduction of the Journaled File System (JFS) and SMIT. |
| AIX 4.1 | 1994 | RS/6000 (PowerPC) | Symmetric Multiprocessing (SMP) and CDE GUI. |
| AIX 4.3 | 1997 | POWER3 | First 64-bit support and IPv6 integration. |
| AIX 5L 5.1 | 2001 | POWER4 | The "L" signified Linux affinity; first LPAR support. |
| AIX 5.3 | 2004 | POWER5 | Micro-partitioning and Simultaneous Multithreading (SMT). |
| AIX 6.1 | 2007 | POWER6 | Workload Partitions (WPARs) and Live Partition Mobility. |
| AIX 7.1 | 2010 | POWER7 | Enhanced scalability (up to 256 cores/1024 threads). |
| AIX 7.2 | 2015 | POWER8 / POWER9 | AIX Live Update (patching without reboots). |
| AIX 7.3 | 2021 | POWER10 / Power11 | Hybrid cloud integration, NVMe over Fabrics, and AI acceleration. |
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