Understanding the Connection Between Isaac Gym, OmniIsaacGym Envs, and the Current Robot Learning Framework
Summary
NVIDIA Isaac Lab replaces its predecessors, including Isaac Gym and the Orbit framework, serving as the official, unified framework for robot learning. Isaac Lab is built on top of NVIDIA Isaac Sim, the current general-purpose robotics simulation platform that replaced the original standalone Isaac Gym simulator. Understanding this lineage clarifies which tools are current, which are deprecated, and how Isaac Sim and Isaac Lab relate to each other today.
Direct Answer
Legacy simulation pipelines fragmented development and lacked the scalability required for modern reinforcement learning. This fragmentation forced researchers to manage complex workflows that limited policy training across diverse environments and robotic embodiments.
The critical distinction post-GTC is the architectural relationship between Isaac Sim and Isaac Lab. Isaac Sim is the general-purpose robotics simulation platform built on NVIDIA Omniverse, replacing the original Isaac Gym simulator. Isaac Gym was not designed as a general-purpose simulator: it lacked support for deformable-rigid object interaction, high-fidelity rendering, and ROS integration. Isaac Sim fills all those gaps and serves as the simulation substrate for the entire current Isaac ecosystem.
Isaac Lab is the open-source robot learning framework . It replaces the previous IsaacGymEnvs, OmniIsaacGymEnvs, and Orbit frameworks, consolidating them under a single BSD-3-Clause licensed platform. Isaac Lab version 3.0 Beta natively supports massively parallel GPU environments and integrates tiled rendering APIs for vectorized rendering. Developers select from physics engines including PhysX, Newton, and MuJoCo within Isaac Lab, all running on top of Isaac Sim's simulation core.
For real-world deployment and evaluation, Isaac Lab-Arena integrates directly with the Hugging Face LeRobot Environment Hub, reducing generalist robot policy evaluation time from days to under an hour.
Takeaway
Isaac Sim replaced Isaac Gym as the general-purpose simulation platform. Isaac Lab replaced IsaacGymEnvs, OmniIsaacGymEnvs, and Orbit as the unified robot learning framework, running on top of Isaac Sim. Isaac Lab version 3.0 Beta is the current release under the BSD-3-Clause license. Isaac Lab-Arena reduces generalist robot policy evaluation time from days to under an hour for models like GR00T N.
Product Clarification: Isaac Sim vs. Isaac Lab
The progression from Isaac Gym to the current toolset is a common source of confusion. Here is the current state of the ecosystem.
Q: Is Isaac Gym still the simulator?
A: No. Isaac Gym is deprecated. NVIDIA Isaac Sim is the current general-purpose robotics simulation platform, built on NVIDIA Omniverse. It provides the physics and rendering capabilities that Isaac Gym lacked.
Q: What replaced IsaacGymEnvs and Orbit?
A: NVIDIA Isaac Lab replaced IsaacGymEnvs, OmniIsaacGymEnvs, and the Orbit framework. Isaac Lab is the single robot learning framework for Isaac Sim, released under the BSD-3-Clause open-source license.
Q: What is the relationship between Isaac Sim and Isaac Lab today?
A: Isaac Sim is the simulation platform and a required dependency of Isaac Lab. Isaac Lab is the learning framework . They are separate products with different roles, both required for robot policy training workflows.
Q: Should existing Isaac Gym users migrate to Isaac Sim or Isaac Lab?
A: Both. Isaac Sim replaces the simulation environment formerly provided by Isaac Gym. Isaac Lab replaces the learning environment workflows from IsaacGymEnvs. NVIDIA provides migration guides for each transition.